Tire Changer Introduction

Tire changers, also known as tire changers and tire changers, are used to install and unload tires for cars. They can replace tires for different vehicles such as cars, motorcycles and heavy trucks, and are essential equipment for auto repair shops and 4S stores. There are two kinds of pneumatic type and hydraulic type, the most commonly used is pneumatic type.

Chinese name Tire changer Foreign name tire changer Brief Install and uninstall car tires

table of Contents

1 Classification and structure

▪ Structure

▪ Classification

2 use process

3 Maintenance and cultivation

4 Shantou analysis

▪ Structure

▪ Principle of automatic rotation

5 The consequences of improper operation

Classification and Structure Editing

structure

1. Host Workbench: Tires are mainly demolished on this stage, mainly for placement of tires, rotation, etc.

Tyre changer

Tyre changer

2. Separation arm: On the side of the tire removal machine, it is mainly used to separate the tire from the wheel rim.

3. Recharging and deflation device: It is mainly used to release the tire's gas to facilitate inflation or disassembly, as well as a barometric pressure gauge. The average tire is about 2.2 atmospheres. Also equal to 0.2Mpa.

4. Foot pedals: There are 3 foot pedal switches under the tyre changer. They function as clockwise counter-clockwise rotary switches, separate tightening switches, and separate wheel rims and tire switches.

5, Lubricating liquid: conducive to the disassembly and assembly of tires, reduce tire damage in the process of demolition, so that the tire disassembly work is better completed.

6, compressed air interface.

classification

Common types of tire changers on the market are mainly classified into two categories: one is a small vertical tire changer for disassembling the tires of passenger cars; the other is a large horizontal tire disassembly used to disassemble large truck tires. machine.

Nowadays, the main structure of a large-scale tire changer is mainly composed of a power unit, a fuel tank, a support arm, a claw, a hammer, and an operating console. There are three cylinders in the structure to complete the movement through the hydraulic system. One is to support the claw to open and retract the cylinder to clamp and release the tire. The second is to support the support arm to rotate the cylinder to lift the tire. The third is Supports the head section to move the cylinder back and forth to complete the tire installation and removal.

In the entire operation process, basically automatic operation is achieved, but the operation of the steamed bread head is still to be completed by manual operation, so that the labor intensity is increased. If the steamer system can be used to complete the operation of the steamed bread, it will be greatly Reduce labor intensity and fully realize the automation of equipment. [1] 

Use process editing

I. Preparation:

1) Turn on the machine's power and air supply.

2) Commissioning operations. Depress the left pedal, the chuck rotates clockwise; Depress the right pedal, remove the shovel action, Release the shovel and return it to its original position

Tyre changer

Tyre changer

The middle pedal, the jaws on the chuck are opened, and then the claws are closed again.

3) Let go of the air inside the tire and take off all the weights.

Second, remove the tire:

1) Open the bead lip and place the tire on the right side of the decalcification. The tire rests on the rubber support plate and presses the removal blade against the bead lip, approximately 1 cm from the edge of the rim. Depress the right pedal and remove the shovel. Repeat this action on both sides of the tire until the bead is completely detached.

2) Place the tire on the chuck of the tyre changer. Apply grease or similar lubricant to the bead lip (prevents tire wear).

3) Step on the middle pedal and hold the rim. Lock the tires according to the specified size by the following method.

Outside the wheel lock method; The middle pedal stepped to the middle position, according to the reference point on the chuck to the claw positioning. Place the tire on the jaws, hold the rim, and step on the middle pedal until it clicks.

Locking method in the rim: Position the jaws so that they are all closed, place the tire on the jaws, lower the middle pedal and open the jaws until the rim is jammed.

4) After confirming that the rim is firmly stuck, lower the pressure lever so that the bead lip disassembly head rests on the upper edge of the rim, turn the locking handle, lock the horizontal and straight arm, and make the disassembly head automatically detach about 2mm from the rim. . Insert the crowbar into the front of the bead lip disassembly head and peel off the tire bead lip with a crowbar.

5) With the crowbar held in place, press the left pedal to rotate the chuck clockwise until the tire is completely separated from the rim and lift the tire upward. The other side of the bead is completely separated from the rim in the same way; the tire is removed.

6) Remove the inner tube and lift the tire up so that the other side is separated from the outer rim.

Third, tire assembly

1) Check carefully whether the diameter of the tire and the rim match in front of the equipment.

2) Place the tire on the tyre changer platform and check its condition.

3) Place the tire on the tire remover chuck and step on the middle pedal to catch the rim. When locking the rim, do not place your hand between the rim and the claw.

Tyre changer

Tyre changer

Injury to the opponent. If the rims are the same size, it is not necessary to frequently loosen or lock the cantilever. Simply turn the cross arm back and forth.

4) To avoid damage to the rim, apply special lubricant to the bead lip.

5) Put the tire on the rim, the bead lip moves to the edge of the disassembly head, press down the disassembly head, press the rim into the rim and push down the tire with both hands. Step on the left board, turn the chuck and rim clockwise, and replace the tire.

6) Press down on the tire and insert it into the inner tube. Repeat the previous step and insert the tire lip on the other side into the rim.

7) Inflate the tire and remove the tire. Note: Be careful when inflating and strictly follow the requirements below, otherwise it may cause the tire to explode and cause casualties. One must carefully check whether the rim matches the tire and check the wear of the tire to confirm that the tire is not damaged. Second, the pneumatic gun equipped with a barometer should be used to inflate. When inflating, the pressure should be checked frequently and the rated pressure of the tire must not be exceeded. Third, keep your hands and body away from your tires.

8) Turn off the machine's power and air supply. [2] 

Maintenance and Accomplishment Editing

In order to extend the service life of the machine, maintenance should be carried out regularly according to the requirements of the instructions, otherwise the reliability of the work will be affected.

Tyre changer

Tyre changer

1) Before carrying out any maintenance work, you must disconnect the machine from the power supply and air supply, and then press the pedal 3 to 4 times to remove the residual compressed air in the machine.

2) Damaged parts must be replaced by professional maintenance personnel using spare parts provided by the manufacturer.

3) Clean the chuck once a week with diesel to prevent dust accumulation and lubricate the jaws and guide rails.

4) After 20 days of machine use, re-tighten the screws on the chuck and claw.

5) If the rotational force of the chuck is not enough, the tension of the belt may be insufficient. Loosen the screws on the left side panel, remove the side panel, loosen the two screws that secure the motor, adjust the distance between the bracket and motor mount, tighten the drive belt, and then tighten the screws.

6) The boom cannot be locked or disassembled. When the distance from the rim is not up to the required (2mm), the boom locking plate should be adjusted.

7) In order to make the claws and the cylinder of the dismounting shovel open and reliable, the control valve connected to them should be kept clean. The following requirements can be maintained:

1 Remove the 6 screws on the left side of the fuselage and remove the side plates. 2 Loosen the valve body on the jaw opening, closing or cylinder control pedal. 3 Clean the valve body with compressed air. If it is damaged It should be replaced.

8) Check and maintain the oil mist cylinder and oil level once a month. If you need to add oil, you can directly screw down the lower end of the oil mister to inject oil. Do not inject too much oil when filling so as to avoid spillage. [2] 

Shantou Analysis and Editing

structure

The automatic rotary boring head is composed of a pin shaft, a cylinder sleeve, an oil cylinder, a rotary sleeve, a sliding shaft, a sleeve outer ring, a copper pad, a hammer head assembly, and a fixing pin.

Tyre changer

Tyre changer

Shafts, screws and glands and other components.

The oil cylinder is connected with the oil cylinder sleeve through the pin shaft, and the external sleeve is welded with the oil cylinder sleeve into one body. The rotary sleeve is sleeved in the oil cylinder sleeve. A copper pad is placed on the shoulder of the rotary sleeve to reduce the friction during rotation. Force, the cover is fixed by screws in the sleeve of the oil cylinder, the slide shaft is installed on the outer end of the piston and passes through the spiral groove of the rotary sleeve and the long groove of the oil jacket, and the adjustment shaft is installed in the rotary sleeve and fixed by the fixing pin. . The hammer assembly is bolted to the adjustment shaft.

Automatic rotation principle

Spiral transmission is usually applied to the case where it is converted from circular motion to linear motion. However, when the helical angle is larger than the self-locking angle, it can also be converted from linear motion to circular motion. This mechanism evolved based on this principle. This mechanism is not a simple bolt-nut transmission structure. In order to simplify the structure and facilitate machining, the bolt portion has been simplified as a sliding shaft, and the nut part is a double-head spiral sleeve. The shape of the teeth is rectangular.

When the piston rod expands and contracts, the sliding shaft drives the linear movement in the long groove of the cylinder jacket. Since the sliding shaft passes through the spiral groove of the rotating sleeve at the same time, the axial position of the rotating sleeve has been defined by the cylinder sleeve and the gland, ie, the rotating sleeve. Can not do axial movement, so the sliding axis can only drive the rotation sleeve to do the rotation movement, that is, the linear movement of the sliding axis is transformed into the rotation of the rotation sleeve, which is to realize the automatic rotation of the hammer head. Since each spiral groove on the rotating sleeve is exactly a half coil, the hammer can rotate 180 degrees to meet the use requirements. [3]

Misconduct consequences

Improper use of a tire changer to disassemble or assemble a tire often results in deformation or damage to the bead area of the tire, and affects the airtightness of the tire or causes bulging on the sidewall of the tire, which in turn breaks the tire carcass cord. scrapped. In addition, the yellow dot of the tire sidewall mark should be aligned with the valve installation, because the yellow dot is the lightest part of the tire circumference, so that the weight of the lead weight at the balance point can be reduced when the wheel is in dynamic balance. [4]