Piston press fitting device

Abstract

The utility model relates to a piston press-fitting device which comprises a piston press-fitting assembly and a piston positioning frame, and the piston press-fitting assembly comprises a supporting frame, a pressing head with a containing groove in the bottom and a driving device. The pressing head and the piston positioning frame are coaxially arranged on the supporting frame in a vertically spaced mode, and the piston positioning frame is used for centering and positioning a main piston assembly or a parking piston of the brake cylinder. A magnet is embedded in the bottom face of the pressing head, the bottom face of the pressing head can attract the bottom of an annular groove of a leather cup of the brake cylinder through the magnet, and an inner ring of the leather cup can be contained in the containing groove. The driving device is connected with the pressing head and can drive the pressing head to move up and down. The piston press-fitting device can effectively guarantee the accuracy of press-fitting of the piston leather cup and is easy and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the application field of railway locomotive vehicle foundation brake, in particular to a piston press-fitting device. Background Art

[0002] At present, there are about 3,500 EMUs in stock. In recent years, the output of new EMUs has been stable, and the annual growth rate of EMUs under maintenance has reached more than 20%. With the continuous development of maintenance business, the maintenance business has also been continuously expanded. At the same time, customers' requirements for the maintenance process level, quality capability, maintenance cycle, maintenance cost, and maintenance data of brake caliper units have also been continuously improved. At present, the assembly process of brake caliper units has problems such as low degree of automation, low precision, high labor intensity, and low installation efficiency.

[0003] The assembly of brake cylinder includes two parts: pre-assembly and final assembly. The pre-assembly includes cylinder body, piston, clearance adjuster, connecting rod, parking cylinder, hand release, etc. The final assembly assembles the pre-assembled parts in sequence to form a brake cylinder. During pre-assembly, the leather cup needs to be pressed onto the main piston and parking piston of the brake cylinder. In the prior art, when assembling the leather cup onto the piston, the piston is simply placed randomly and the leather cup is pressed by a press. There is no positioning for the piston and the leather cup. It is difficult to align the leather cup during installation. The two are easily out of center and deviate, which affects the braking performance of the product. Utility Model Content

[0004] The utility model aims to provide a piston press-fitting device, which can effectively ensure the accuracy of the piston leather cup during press-fitting and is easy to operate.

[0005] The purpose of the utility model is achieved in this way. A piston press-fitting device includes a piston press-fitting assembly and a piston positioning frame. The piston press-fitting assembly includes a support frame, a pressure head with a receiving groove at the bottom, and a driving device; the pressure head and the piston positioning frame are spaced up and down and coaxially arranged on the support frame, and the piston positioning frame is used to center and position the main piston component of the brake cylinder or the parking piston; a magnet is embedded in the bottom surface of the pressure head, and the bottom surface of the pressure head can adsorb the bottom of the annular groove of the leather cup of the brake cylinder through the magnet, and the inner ring of the leather cup can be accommodated in the receiving groove; the driving device is connected to the pressure head and can drive the pressure head to move up and down.

[0006] In a preferred embodiment of the utility model, the piston positioning frame includes an upper plate body and a lower plate body spaced apart from each other and a plurality of connecting columns connected between the upper plate body and the lower plate body; the upper plate body has a center hole at the center, and a notch connected to the center hole and the edge of the upper plate body is opened on the upper plate body; two transverse push rods are arranged opposite each other and can elastically extend and retract at the bottom of the upper plate body, and the axes of the transverse push rods are perpendicular to the center line of the notch; the main piston assembly can be pushed into the upper plate body through the notch, and the ends of the two transverse push rods can abut against the outer wall of the main piston assembly.

[0007] In a preferred embodiment of the utility model, a fixed body is fixedly provided at the bottom of the upper plate body, the first end of the transverse push rod can be axially slidably inserted in the slide groove of the fixed body, and a return spring is clamped between the first end of the transverse push rod and the fixed body, and the second end of the transverse push rod is connected to a roller, and the axis of the roller is arranged along the vertical direction.

[0008] In a preferred embodiment of the present utility model, the piston positioning frame includes an upper plate body and a lower plate body spaced apart from each other and a plurality of connecting columns connected between the upper plate body and the lower plate body; the upper plate body has a center hole in the center, and a positioning column is provided on the lower plate body, the positioning column can pass through the center hole, and the parking piston can be inserted into the center hole and sleeved on the positioning column.

[0009] In a preferred embodiment of the present invention, two notches are provided on both sides of the upper plate.

[0010] In a preferred embodiment of the present utility model, an oil injection hole penetrating through the bottom surface of the pressure head is provided in the pressure head, and a pipe joint communicating with the oil injection hole is provided on the pressure head.

[0011] In a preferred embodiment of the present invention, the lower plate is rotatably connected to the support frame.

[0012] In a preferred embodiment of the utility model, the pressure head includes a connecting plate and a pressure ring arranged at an upper and lower interval, a plurality of oblique ribs are circumferentially connected between the connecting plate and the pressure ring, and the space enclosed by the connecting plate, the pressure ring and the plurality of oblique ribs constitutes a receiving groove.

[0013] In a preferred embodiment of the present invention, a plurality of insertion grooves are circumferentially provided in the bottom surface of the pressure ring, and the magnet includes a plurality of magnetic blocks, which are respectively inserted and fixed in the corresponding insertion grooves.

[0014] In a preferred embodiment of the present invention, the driving device is a cylinder, the piston rod of the cylinder is vertically arranged and the bottom end of the piston rod is fixedly connected to the connecting plate.

[0015] As described above, the piston press-fitting device of the utility model can be applied to existing brake caliper unit products of railway locomotives and vehicles, and can be used for press-fitting of the leather cup on the main piston and the leather cup on the parking piston. By ensuring that the pressure head and the piston positioning frame are set concentrically, the leather cup is accurately positioned by magnetically adsorbing the inner wall of the groove bottom of the leather cup to ensure that the leather cup is concentric with the pressure head, and the piston positioning frame is used to ensure the centering positioning of the main piston assembly or the parking piston, which can effectively ensure the concentricity of the leather cup and the piston when the leather cup is pressed, and ensure the braking performance of the product. When the entire device is used, the staff only needs to place the main piston assembly or the parking piston in the piston positioning frame, adsorb the leather cup on the pressure head, and then use the driving device to drive the leather cup to press down. It is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0017] Figure 1 : It is a structural schematic diagram of the piston press-fitting device provided by the utility model.

[0018] Figure 2 :for Figure 1 A partial enlarged view of the transverse push rod.

[0019] Figure 3 : A three-dimensional diagram of the main piston assembly provided by the utility model before the first leather cup is pressed.

[0020] Figure 4 : A three-dimensional diagram of the piston press-fitting device provided by the utility model after the main piston is placed in the assembly.

[0021] Figure 5 : It is a front view of the main piston after being placed in the piston press-fitting device provided by the utility model.

[0022] Figure 6 : Another schematic diagram of the piston press-fitting device provided by the utility model.

[0023] Figure 7 : A three-dimensional diagram of the piston press-fitting device provided by the utility model after the piston is installed and parked.

[0024] Description of Figure Numbers:

[0025] 1. Support frame;

[0026] 2. Pressure head; 21. Pipe joint; 22. Connecting plate; 23. Pressure ring; 24. Oblique rib;

[0027] 3. Driving device; 31. Switch;

[0028] 4. Piston positioning frame; 41. Upper plate; 411. Center hole; 412. Notch; 413. Slot; 42. Lower plate; 43. Connecting column; 44. Transverse push rod; 45. Fixed body; 46. Roller; 47. Positioning column;

[0029] 5. Main piston components; 51. Main piston; 52. Main piston cylinder;

[0030] 6. Park the piston. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0032] like Figures 1 to 7 As shown, this embodiment provides a piston pressing device, including a piston pressing assembly and a piston positioning frame 4, the piston pressing assembly includes a support frame 1, a pressure head 2 with a receiving groove at the bottom, and a driving device 3; the pressure head 2 and the piston positioning frame 4 are arranged on the support frame 1 with an upper and lower spacing and coaxially, and the piston positioning frame 4 is used to center and position the main piston component 5 or the parking piston 6 of the brake cylinder; a magnet is embedded in the bottom surface of the pressure head 2, and the bottom surface of the pressure head 2 can adsorb the bottom of the annular groove of the leather cup of the brake cylinder through the magnet, and the inner ring of the leather cup can be accommodated in the receiving groove; the driving device 3 is connected to the pressure head 2, and can drive the pressure head 2 to move up and down.

[0033] The piston pressing device is mainly used to press the leather cup of the brake cylinder onto the piston, for example, it can be used to press the first leather cup of the brake cylinder onto the main piston 51 of the main piston assembly 5, or to press the second leather cup of the brake cylinder onto the parking piston 6 of the parking cylinder.

[0034] Among them, refer to Figure 3 The structure of the main piston assembly 5 is an existing structure, which includes a bowl-shaped main piston 51, a main piston cylinder 52 and a first leather cup. The main piston 51 is roughly bowl-shaped, and has an integrally connected main piston inner sleeve inside. The main piston inner sleeve has an internal thread and can be threadedly connected to the end of the main piston cylinder 52. The first leather cup is an annular structure with an annular groove formed by an outer ring, an inner ring and a circular ring between the outer ring and the inner ring. It is a rubber part with a metal skeleton. When assembling, the main piston 51 is first connected to the main piston cylinder 52, and then the annular first leather cup needs to be pressed and set on the main piston 51, and the outer wall of the bottom of the annular groove of the first leather cup is close to the bowl edge of the main piston 51. The brake cylinder mentioned in this article is an air brake. When working, the air acts on the first leather cup to provide thrust, thereby pushing the main piston 51 forward to generate braking force.

[0035] The above-mentioned piston press-fitting device is used to press-fit the first leather cup onto the main piston 51. The press-fitting process is specifically as follows: the main piston assembly 5 is placed in the piston positioning frame 4 to realize the centering positioning of the main piston assembly 5; the first leather cup is placed in a direction with the notch of the ring groove facing upward, so that the inner wall of the bottom of the ring groove is magnetically adsorbed on the bottom surface of the pressure head 2, the inner ring of the first leather cup is inserted into the receiving groove of the pressure head 2 and abuts against the inner wall of the receiving groove, and the outer ring of the first leather cup abuts against the outer wall of the receiving groove of the pressure head 2. Then, the driving device 3 is used to drive the pressure head 2 to move downward, driving the first leather cup to move downward, and after the first leather cup is sleeved on the main piston 51, the pressure head 2 continues to press downward, and the first leather cup is tightly sleeved on the main piston 51 and the outer wall of the bottom of the ring groove of the first leather cup abuts against the bowl-shaped bowl edge of the main piston 51. Then the driving device 3 drives the pressure head 2 to move upward, so that it can be separated from the first leather cup, and the press-fitting of the leather cup of the main piston 51 is completed.

[0036] By ensuring that the pressure head 2 and the piston positioning frame 4 are concentrically arranged, the first leather cup is concentric with the pressure head 2 during installation, and the piston positioning frame 4 is used to center the main piston assembly 5, it can be ensured that the first leather cup is aligned with the main piston 51 when the first leather cup is pressed down, and the concentricity of the first leather cup and the main piston 51 is ensured; at the same time, since the outer wall of the main piston 51 is an inverted cone surface, when the first leather cup is pressed down, the inverted cone surface and the leather cup are used to cooperate, which also has a self-positioning effect, thereby effectively ensuring the concentricity of the leather cup press-fitting of the main piston 51. The pressure head 2 is equipped with a strong magnet that can absorb the leather cup to ensure the accurate positioning of the leather cup.

[0037] Currently, the commonly used parking cylinders include two different types of parking cylinders, both of which are existing structures. The two types of parking cylinders have the same function, which is used for parking brakes. Both types of parking cylinders include a parking cylinder body and a parking cylinder head, and a parking piston and a parking spring are arranged in the parking cylinder body. One type of parking cylinder is generally square, and a leather cup (referred to as the second leather cup) needs to be pressed on its parking piston 6. The other type of parking cylinder is generally cylindrical, and a K-ring needs to be installed on its parking piston. When actually assembling the brake cylinder, only one parking cylinder needs to be assembled, and a matching parking cylinder is selected according to the type of brake cylinder.

[0038] The parking cylinder applicable to the piston press-fitting device in this embodiment is the parking cylinder on which the leather cup needs to be installed on the parking piston 6 mentioned above, and the process of press-fitting the leather cup on the parking piston 6 mentioned in this article is also for this type of parking cylinder. The structure of the parking piston 6 of this type of parking cylinder is similar to that of the main piston 51 mentioned above, and the second leather cup is press-fitted on the parking piston 6 using the above-mentioned piston press-fitting device, and the press-fitting process is similar to that of press-fitting the first leather cup on the main piston 51, which will not be repeated here.

[0039] Therefore, the piston press-fitting device in this embodiment can be applied to existing brake caliper unit products of railway locomotives and vehicles, and can be used for press-fitting the leather cup on the main piston 51 and the leather cup on the parking piston 6. By ensuring that the pressure head 2 and the piston positioning frame 4 are arranged concentrically, the leather cup is accurately positioned by magnetically adsorbing the inner wall of the groove bottom of the leather cup to ensure that the leather cup is concentric with the pressure head 2, and the piston positioning frame 4 is used to ensure the centering positioning of the main piston assembly 5 or the parking piston 6, which can effectively ensure the concentricity of the leather cup and the piston when the leather cup is pressed, and ensure the braking performance of the product. When the entire device is used, the staff only needs to place the main piston assembly 5 or the parking piston 6 in the piston positioning frame 4, adsorb the leather cup on the pressure head 2, and then use the driving device 3 to drive the leather cup to press down, which is simple and convenient.

[0040] In a specific implementation, in order to facilitate the centering positioning of the piston positioning frame 4 on the main piston assembly 5, refer to Figures 1 to 5The piston positioning frame 4 includes an upper plate body 41 and a lower plate body 42 which are spaced apart from each other, and a plurality of connecting columns 43 connected between the upper plate body 41 and the lower plate body 42; the upper plate body 41 has a center hole 411 at the center, and a notch 412 which is connected to the center hole 411 and the edge of the upper plate body 41 is provided on the upper plate body 41 (the notch 412 is formed by extending from both ends of the diameter of the circular first center hole 411 to the edge of the upper plate body 41); two transverse push rods 44 which are arranged opposite to each other and can be elastically retracted are provided at the bottom of the upper plate body 41, and the axis of the transverse push rods 44 is perpendicular to the center line of the notch 412; the main piston assembly 5 can be pushed into the upper plate body 41 through the notch 412, and the ends of the two transverse push rods 44 can abut against the outer wall of the main piston assembly 5 (specifically, against the side wall of the main piston cylinder 52).

[0041] The center hole 411 is preferably a circular hole to avoid bumping the main piston assembly 5. When in use, the main piston assembly 5 is pushed into the upper plate body 41 through the notch 412, so that the main piston assembly 5 is roughly in the center position (the bowl edge of the main piston 51 abuts against the top surface of the upper plate body 41), and at the same time, the two lateral push rods 44 on the left and right sides abut against the main piston cylinder 52, so that the main piston assembly 5 can be aligned left and right, thereby achieving basic centering positioning of the main piston assembly 5.

[0042] It can be understood that for different brake cylinders, the main piston assembly 5 has different size specifications. The size of the center hole 411 and the notch 412 should ensure that the main piston assembly 5 with the largest diameter can be placed therein. The gap between the two transverse push rods 44 when they are in a freely extended state should be smaller than the minimum specification diameter of the main piston cylinder 52. The gap between the two transverse push rods 44 when they are in a retracted state should be larger than the maximum specification diameter of the main piston cylinder 52. When the device is applied to main piston assemblies 5 of different sizes, even if the piston positioning frame 4 does not completely align the main piston assembly 5, it will not deviate too much due to the action of the two transverse push rods 44. Then, by utilizing the guiding effect of the inverted conical surface on the main piston 51 when pressed down and the self-positioning function of the first leather cup when pressed down, the centering press installation of the main piston 51 and the first leather cup can be well achieved.

[0043] In order to facilitate the elastic expansion and contraction of the lateral push rod 44, refer to Figure 2 A fixed body 45 is fixedly provided at the bottom of the upper plate body 41, and the first end of the transverse push rod 44 can be axially slidably inserted into the slide groove of the fixed body 45, and a return spring is clamped between the first end of the transverse push rod 44 and the fixed body 45, and the second end of the transverse push rod 44 is connected to a roller 46, and the axis of the roller 46 is set in the vertical direction.

[0044] The fixed body 45 here can be a plate-shaped structure, and the two ends of the return spring respectively press against the first end of the transverse push rod 44 and the bottom of the slide groove, and a limit portion is provided at the notch end of the slide groove to prevent the transverse push rod 44 from separating from the fixed body 45. The roller 46 design is adopted, and in the process of pushing the main piston assembly 5 from the notch 412 into the upper plate body 41, the force is smaller, and the movement of the main piston assembly 5 is smoother.

[0045] Further, in order to facilitate the centering positioning of the piston positioning frame 4 on the parking piston 6, refer to Figure 6 and Figure 7 The piston positioning frame 4 includes an upper plate body 41 and a lower plate body 42 which are spaced apart from each other, and a plurality of connecting columns 43 connected between the upper plate body 41 and the lower plate body 42; the upper plate body 41 has a center hole 411 at the center, and a positioning column 47 is provided on the lower plate body 42, and the positioning column 47 can pass through the center hole 411, and the parking piston 6 can be inserted into the center hole 411 and sleeved on the positioning column 47.

[0046] The parking piston 6 is an existing structure, which is similar to the structure of the main piston 51, except that the parking piston 6 is not connected to the piston cylinder, and the bowl-shaped bottom of the parking piston 6 is not closed. Specifically, the parking piston 6 is bowl-shaped, and has an integrally connected parking inner sleeve inside, and the bowl-shaped bottom of the parking piston 6 has a through hole located in the center. The structure of the second leather cup is the same as that of the first leather cup. Since the parking inner sleeve in the parking piston 6 is relatively short, the structure of the piston positioning frame 4 used to place the parking piston 6 is different from the structure of the piston positioning frame 4 used to place the main piston assembly 5.

[0047] Generally, two notches 413 are provided on both sides of the upper plate 41 to facilitate operators to take out the parking piston 6 .

[0048] When the second leather cup is pressed onto the parking piston 6, the parking inner sleeve inside the parking piston 6 is inserted into the center hole 411 and sleeved on the positioning column 47 to achieve centering positioning. At this time, the bowl-shaped bowl edge of the parking piston 6 rests on the top surface of the upper plate body 41. Thereafter, the process of pressing the second leather cup using the piston press-fitting assembly is the same as the process of pressing the first leather cup using the piston press-fitting assembly, which will not be repeated here.

[0049] After that, the pressure head 2 in the piston press-fitting assembly can be replaced with a flat pressure head, and the parking piston sleeve is passed through the through hole of the bowl bottom of the parking piston 6 and aligned with the inner hole of the parking inner sleeve. The driving device 3 of the piston press-fitting assembly drives the flat pressure head downward, and the parking piston sleeve can be press-fitted into the inner hole of the parking piston 6. Since the parking piston 6 has a relatively high hardness, the parking piston sleeve and the parking inner sleeve are interference fit, and it is more time-saving and labor-saving to press-fit using a press machine.

[0050] Furthermore, an oil injection hole penetrating through the bottom surface of the pressure head 2 is provided in the pressure head 2, and a pipe joint 21 communicating with the oil injection hole is provided on the pressure head 2. Preferably, the lower plate 42 is rotatably connected to the support frame 1.

[0051] The above-mentioned oil injection hole can be provided with one, and the pipeline joint 21 is also provided with one, and the pipeline joint 21 is connected with the corresponding grease tank through the corresponding pipeline. The bottom of the lower plate body 42 can be connected with the support frame 1 through a bearing, so as to be manually rotated.

[0052] After the first leather cup is pressed tightly against the main piston 51 and the second leather cup is pressed tightly against the parking piston 6, the oil spray hole on the pressure head 2 can be used to spray oil on the leather cup to improve lubricity. Specifically, the driving device 3 is used to drive the pressure head 2 to be raised a little, and then the lower plate 42 is manually rotated to drive the leather cup to rotate, and grease can be sprayed on the surface of the leather cup through the oil spray hole; generally, manually rotating the lower plate 42 once is sufficient.

[0053] Since the amount of grease required for the leather cup is greater than that required for the inner and outer surfaces of the main piston 51 (parking piston 6), after the leather cup of the main piston 51 is press-fitted and before both are taken out, and before the leather cup of the parking piston 6 is press-fitted and the parking piston sleeve is press-fitted, the lower plate 42 is directly rotated manually, and the leather cup is sprayed with oil using the oil injection hole provided on the pressure head 2, which makes the operation more convenient.

[0054] Furthermore, at least one hand valve is provided on the support frame 1, each hand valve is connected to a corresponding grease tank through a corresponding pipeline, and a corresponding pump is provided on the corresponding pipeline, and one of the hand valves is connected to a pipeline connector 21 through a corresponding pipeline. In this way, different types of grease can be stored in each grease tank, and when a certain type of grease needs to be sprayed, the hand valve corresponding to the grease tank is connected to the pipeline connector 21 through a pipeline, and the grease can be sprayed on the first leather cup, which is more versatile.

[0055] For ease of processing and installation, refer to Figure 1 The pressure head 2 includes a connecting plate 22 and a pressing ring 23 (generally, the outer diameter of the pressing ring 23 is larger than the diameter of the connecting plate 22) arranged at intervals in the upper and lower directions. A plurality of oblique ribs 24 are connected circumferentially at intervals between the connecting plate 22 and the pressing ring 23. The space enclosed by the connecting plate 22, the pressing ring 23 and the plurality of oblique ribs 24 constitutes a receiving groove. A plurality of insertion grooves are circumferentially opened in the bottom surface of the pressing ring 23. The magnet includes a plurality of magnetic blocks, which are respectively inserted and fixed in the corresponding insertion grooves.

[0056] The driving device 3 can be, for example, a cylinder, the piston rod of which is vertically arranged and the bottom end of which is fixedly connected to the connecting plate 22 of the pressure head 2, so as to drive the pressure head 2 to move up and down. A switch 31 is also provided on the support frame 1, and the switch 31 is used to control the action of the cylinder. The switch 31 can be, for example, a hand valve, and the operator can manually operate the hand valve to control the cylinder to move up or down.

[0057] The above is only an illustrative embodiment of the utility model, and is not intended to limit the scope of the utility model. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. A piston press-fitting device, characterized in that: It comprises a piston press assembly and a piston positioning frame, wherein the piston press assembly comprises a support frame, a pressing head with a receiving groove at the bottom, and a driving device; The pressure head and the piston positioning frame are spaced apart from each other and are coaxially arranged on the support frame. The piston positioning frame is used to center and position the main piston component or parking piston of the brake cylinder; a magnet is embedded in the bottom surface of the pressure head, and the bottom surface of the pressure head can adsorb the bottom of the annular groove of the leather cup of the brake cylinder through the magnet, and the inner ring of the leather cup can be accommodated in the accommodating groove; the driving device is connected to the pressure head and can drive the pressure head to move up and down.

2. The piston press-fitting device according to claim 1, characterized in that: The piston positioning frame includes an upper plate body and a lower plate body spaced apart from each other and a plurality of connecting columns connected between the upper plate body and the lower plate body; The upper plate body has a center hole at the center, and a notch connected to the center hole and the edge of the upper plate body is provided on the upper plate body; two transverse push rods are arranged opposite each other and can elastically extend and retract, and the axes of the transverse push rods are perpendicular to the center line of the notch; the main piston assembly can be pushed into the upper plate body through the notch, and the ends of the two transverse push rods can abut against the outer wall of the main piston assembly.

3. The piston press-fitting device according to claim 2, characterized in that: A fixed body is fixed at the bottom of the upper plate body, the first end of the transverse push rod can be axially slidably inserted in the slide groove of the fixed body, and a return spring is clamped between the first end of the transverse push rod and the fixed body, the second end of the transverse push rod is connected to a roller, and the axis of the roller is arranged along the vertical direction.

4. The piston press-fitting device according to claim 1, characterized in that: The piston positioning frame includes an upper plate body and a lower plate body spaced apart from each other and a plurality of connecting columns connected between the upper plate body and the lower plate body; The center of the upper plate body is provided with a center hole, and a positioning column is provided on the lower plate body. The positioning column can pass through the center hole, and the parking piston can be inserted into the center hole and sleeved on the positioning column.

5. The piston press-fitting device according to claim 4, characterized in that: Two notches are arranged on both sides of the upper plate body.

6. The piston press-fitting device according to claim 2 or 4, characterized in that: An oil spray hole penetrating through the bottom surface of the pressure head is provided in the pressure head, and a pipeline joint communicating with the oil spray hole is provided on the pressure head.

7. The piston press-fitting device according to claim 6, characterized in that: The lower plate body is rotatably connected to the support frame.

8. The piston press-fitting device according to claim 1, characterized in that: The pressure head includes a connecting plate and a pressure ring which are arranged at an interval up and down, a plurality of oblique ribs are connected circumferentially at intervals between the connecting plate and the pressure ring, and the space enclosed by the connecting plate, the pressure ring and the plurality of oblique ribs constitutes the accommodating groove.

9. The piston press-fitting device according to claim 8, characterized in that: A plurality of insertion grooves are circumferentially provided in the bottom surface of the pressure ring, and the magnet comprises a plurality of magnetic blocks which are respectively inserted and fixed in the corresponding insertion grooves.

10. The piston press-fitting device according to claim 8, characterized in that: The driving device is a cylinder, the piston rod of the cylinder is vertically arranged and the bottom end of the piston rod is fixedly connected to the connecting plate.

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