Thermal forming device for rubber-coated piston

Abstract

The utility model relates to a thermal forming device for a rubber-coated piston, which comprises a thermal forming unit, a thermal forming unit and a thermal forming unit, the thermal forming unit comprises a forming shell with a vertically-extending forming hole channel, the upper end opening of the forming hole channel is a feeding opening, and the lower end opening of the forming hole channel is a discharging opening; the pressing rod assembly comprises a pressing rod which is located above the forming hole channel and opposite to an upper end opening of the forming hole channel, and the pressing rod is driven by a first driving mechanism to move up and down; the first feeding device is used for feeding the piston piece subjected to pre-encapsulation into the upper end opening of the forming hole channel; and the second feeding device is configured to send a distance piece into the upper end opening of the forming hole channel after the first feeding device puts one piston piece into the forming hole channel every time, so that the two piston pieces which are put into the forming hole channel in sequence are separated through the distance piece. The method has the advantage that the problem that the rejection rate of the piston piece is increased due to extrusion damage of a valve line of the piston piece in the thermal forming process can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts processing, in particular to a thermoforming device for a rubber-coated piston. Background Art

[0002] Automobile suspensions feature shock absorbers installed in parallel with elastic elements. When the vehicle frame and axle vibrate and move relative to each other, the piston inside the shock absorber moves up and down. This frequent relative movement between the piston and the shock absorber cylinder requires coating the piston with a wear-resistant, low-friction material, such as polytetrafluoroethylene, to extend its service life.

[0003] The existing piston overmolding process primarily involves two stages: pre-molding and overmolding. During the pre-molding stage, a tapered mold is typically used. A rubber sheet is placed on top of the mold, and a downward pressure head presses the sheet down along the mold until it wraps around the piston located below. The pre-molded piston undergoes further thermoforming to achieve a qualified final product. The thermoforming device is a piston-coated sheet thermoforming device disclosed in the Chinese invention patent application with application number 201810796605.4, which includes a feeding module arranged on a base plate for transmitting pre-coated pistons, and a clamping and conveying module for delivering the pre-coated pistons to a pressing module; the pressing module includes a press bracket arranged on the base plate, a forming mold assembly is provided on the press bracket, and a clamping device for pressing the pre-coated piston into the forming mold assembly; the forming mold assembly includes a cooling mold shell arranged on the press bracket, a hollow heating section is provided at the upper end of the cooling mold shell, and a hollow cooling section coaxial with the heating section is provided in the cooling mold shell; the outer sealing sleeve of the cooling mold shell is connected to the mold shell sleeve, and a cooling chamber is formed between the cooling mold shell and the mold shell sleeve, and a plurality of fins extending into the cooling chamber are provided on the side of the cooling mold shell.

[0004] Generally speaking, the common thermoforming method is to have multiple pistons in the thermoforming device at the same time. When a piston enters the thermoforming device, the thermoformed piston at the bottom is pushed out of the thermoforming device. However, the existing piston thermoforming device still has certain shortcomings in actual operation, such as Figure 1 and Figure 2As shown, the pre-heated and molded piston member includes a piston member body 7 and a film 73 wrapped around its outer side. The piston member body 7 has an open end 71 and a closed end 72. The end face of the closed end 72 has a circle of contour line 720 (valve line) protruding outward. Due to the structural design limitations of the piston member body itself, the inner diameter size of the port at the open end of the piston member is not much different from the size of the valve line area at the closed end. When multiple piston members are placed in the cooling mold shell of the molding die assembly in turn and are pressed downward by the clamping device, the opening of the piston member at the bottom will inevitably cause extrusion interference with the bottom valve line part of the upper piston member. In particular, when more piston members enter the cold zone mold shell, the greater the extrusion force between the upper and lower piston members, the more likely it is that the valve line of the piston member will be damaged by pressure, resulting in the scrapping of the piston member and an increase in the scrap rate.

[0005] Therefore, the existing thermoforming device for rubber-coated pistons needs further improvement. Utility Model Content

[0006] The technical problem to be solved by the present invention is to provide a thermoforming device for rubber-coated pistons, which can effectively improve the problem of increased piston scrap rate caused by extrusion damage of the valve line of the piston during the thermoforming process, in response to the current status of the existing technology.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a thermoforming device for a rubber-coated piston, comprising:

[0008] The thermoforming unit comprises a forming shell having a vertically extending forming channel, wherein the upper end of the forming channel is a feed port and the lower end is a discharge port;

[0009] A pressure rod assembly includes a pressure rod located above the forming channel and opposite to the upper end of the forming channel, and the pressure rod is driven by a first driving mechanism to move up and down;

[0010] A first feeding device is used to feed the pre-encapsulated piston into the upper end of the forming channel;

[0011] The second feeding device is configured to: after the first feeding device places a piston member into the forming channel, send a spacer into the upper end of the forming channel, so that the two piston members placed in the forming channel one after another are separated by the spacer.

[0012] Generally speaking, if the spacer is made of a material with relatively low hardness such as bakelite, after the spacer separates the upper and lower piston parts, even if the spacer abuts against the valve line part of the piston part, the valve line part will not be damaged. If the spacer is made of a material with relatively high hardness such as alloy metal, it should be considered to make the spacer avoid the valve line part of the piston part. Specifically, the main body of the piston part is cylindrical as a whole, which includes an open end and a closed end. The end face of the closed end has a valve line convex portion protruding axially outward. The position where the spacer placed in the formed channel abuts against the corresponding piston part avoids the valve line convex portion of the piston part.

[0013] In order to make the spacer fit with the piston member so as to avoid the valve line of the piston member, one end of the spacer corresponding to the closed end of the piston member body has an annular stop portion that can be mounted outside the valve line protrusion of the piston member and abut against the outer peripheral edge of the closed end of the piston member body.

[0014] In order to avoid shaking or radial deviation of the spacers and piston parts stacked in sequence during the downward movement of the forming channel, the other end of the spacer away from the annular retaining portion has an outwardly protruding limit boss, and the open end of the piston part can be mounted outside the limit boss and form a radial limit with the limit boss.

[0015] In order to reduce production costs, the spacer is formed by providing a chamfered structure on the inner edge of the open end of the piston. The spacer can be formed by chamfering unqualified piston waste parts. Of course, the spacer can also be specially processed.

[0016] In order to simplify the structure of the first feeding device and the structure of the second feeding device, the first feeding device includes:

[0017] The first feeding tray is used to place the pre-encapsulated piston parts;

[0018] A first conveyor belt is used to receive the piston parts from the first feeding tray and convey the piston parts to the side where the thermoforming unit is located;

[0019] A first push rod is used to push the piston member that has been delivered to the first conveyor belt out of the first conveyor belt and transfer it to the first pre-loading platform;

[0020] A first manipulator is used to transfer the piston member placed on the first pre-loading platform to the upper end of the forming channel;

[0021] The second feeding device comprises:

[0022] A second feeding tray is used to place spacers;

[0023] a second conveyor belt, for receiving the spacers from the second feeding tray and conveying the spacers to the side where the thermoforming unit is located;

[0024] A second pusher rod is used to push the piston member that has been delivered to the position on the second conveyor belt out of the second conveyor belt and transfer it to the second pre-loading platform;

[0025] The second manipulator is used to transfer the piston member placed at the second pre-loading station to the upper end of the forming channel.

[0026] In order to make a reasonable spatial arrangement of the first pre-loading platform, the second pre-loading platform, the first pusher rod and the second pusher rod, the first pre-loading platform is located on the side of the first conveyor belt adjacent to the thermoforming unit, the first pusher rod is located on the side of the first conveyor belt away from the thermoforming unit, the second pre-loading platform is located on the side of the second conveyor belt adjacent to the thermoforming unit, and the second pusher rod is located on the side of the second conveyor belt away from the thermoforming unit.

[0027] In order to facilitate the sequential loading of the piston member and the spacer, the first pre-loading platform and the second pre-loading platform are respectively arranged on both sides of the position where the forming shell of the thermoforming unit is located.

[0028] In order to improve the feeding effect of the piston and the spacer, the invention is characterized in that it also includes:

[0029] a first proximity switch assembly for detecting whether the piston member on the first conveyor belt has been delivered to its proper position, the first proximity switch assembly being electrically connected to a controller, so that the controller controls the movement of the first pusher rod after the first proximity switch assembly detects that the piston member on the first conveyor belt has been delivered to its proper position; and

[0030] A second proximity switch assembly is used to detect whether the spacers on the second conveyor belt are delivered to their proper positions. The second proximity switch assembly is electrically connected to the controller, so that the controller controls the movement of the second push rod after the second proximity switch assembly detects that the spacers on the second conveyor belt are delivered to their proper positions.

[0031] As an improvement, it also includes a processing platform, and the thermoforming unit, the pressure rod assembly, the first feeding device and the second feeding device are all arranged on the processing platform, and the first feeding device and the second feeding device are symmetrically arranged on the processing platform with respect to the thermoforming unit.

[0032] Compared with the prior art, the advantages of the present invention are as follows: a second feeding device is added to the thermoforming device for the rubber-coated piston. After each piston component is placed into the forming channel by the first feeding device, a spacer is fed into the upper port of the forming channel by the second feeding device, so that the two piston components placed in the forming channel one after another are separated by the spacer. After the piston components are separated by the spacer, downward pressure is applied by the pressure rod, and the valve line part of the piston component in the forming channel is not easily damaged by squeezing of adjacent piston components, thereby effectively reducing the scrap rate of the piston component thermoforming processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the piston after pre-encapsulation in the prior art;

[0034] Figure 2 This is a diagram of the upper and lower piston parts in the prior art in the upper and lower mating state (the piston parts are in the axial section state);

[0035] Figure 3 This is a schematic diagram of the three-dimensional structure of a thermoforming device for a rubber-coated piston according to an embodiment of the present utility model;

[0036] Figure 4 A top view of a thermoforming device for a rubber-coated piston according to an embodiment of the present invention;

[0037] Figure 5 for Figure 4 Cross-sectional view at AA in the middle;

[0038] Figure 6 This is a schematic diagram of the three-dimensional structure of a spacer according to an embodiment of the present utility model;

[0039] Figure 7 This is a schematic diagram of the three-dimensional structure of the spacer according to an embodiment of the present invention from another angle;

[0040] Figure 8 This is an axial cross-sectional view of a spacer according to an embodiment of the present invention;

[0041] Figure 9 This is an axial cross-sectional view of the piston member and the spacer member according to an embodiment of the present invention stacked up one above the other. DETAILED DESCRIPTION

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0043] In the specification and claims of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0044] Figure 3-Figure 9 A preferred embodiment of the thermoforming device for rubber-coated pistons of the present invention is shown. The thermoforming device for rubber-coated pistons comprises a processing platform 5, a thermoforming unit 1, a pressure rod assembly 2, a first feeder 3, a second feeder 4, and an operating screen 53. The thermoforming unit 1, pressure rod assembly 2, first feeder 3, second feeder 4, and operating screen 53 are all mounted on the processing platform 5. Specifically, the thermoforming unit 1 is positioned in the center of the processing platform 5, the pressure rod assembly 2 is positioned adjacent to the thermoforming unit 1, and the first feeder 3 and second feeder 4 are symmetrically arranged around the periphery of the thermoforming unit 1.

[0045] See also Figure 5The thermoforming unit 1 includes a molding shell 10 having a vertically extending molding channel 11, wherein the upper end of the molding channel 11 is a feed port, through which the pre-encapsulated piston parts 7 and spacers 8 can enter the molding channel 11 from top to bottom. Under the downward pressure of the pressure rod assembly 2, the piston parts 7 and spacers 8 stacked in sequence in the molding channel 11 move downward along the molding channel 11, and the lower end of the molding channel 11 is the discharge port, and the piston parts 7 and spacers 8 after the thermoforming process are completed fall from the discharge port. The pre-coated piston member 7 is thermoformed in the forming shell 10 of the thermoforming unit 1, so that the pre-coated piston member 7 can be combined with the rubber sheet 73. Similar to the prior art, the forming shell 10 generally includes a heating mold and a cooling mold, which are arranged on the processing platform 5. The specific structure of the heating mold and the cooling mold can be found in the applicant's prior application: Chinese patent application 201810796605.4 discloses a piston rubber sheet thermoforming device, which is incorporated herein by reference in its entirety. The pressure rod assembly 2 cooperates with the above-mentioned forming shell 10. Specifically, the pressure rod assembly 2 includes a pressure rod 21 located above the forming channel 11 and opposite to the upper end of the forming channel 11. The pressure rod 21 is driven by a first drive mechanism 22 to move up and down. The first drive mechanism 22 can be a cylinder, which is arranged directly above the forming shell 10 through a bracket. The pressure rod 21 extends vertically, with its upper end connected to the power output end of the first drive mechanism 22 and its lower end opposite to the upper end of the forming channel 11. When it is necessary to place the piston member 7 or the spacer 8 at the upper port of the molding shell 10, the pressure rod 21 moves upward under the drive of the first drive mechanism 22 to make way. When the piston member 7 or the spacer 8 is placed in place at the upper port of the molding shell 10, the pressure rod 21 moves downward under the drive of the first drive mechanism 22, driving the piston member 7 or the spacer 8 at the upper port of the molding shell 10 to move downward a certain distance (to place the next piston member 7 or spacer 8).

[0046] See also Figure 1 and Figure 2The pre-coated piston 7 comprises a piston body 7 and a film 73 covering the piston body. The piston body 7 has an open end 71 and a closed end 72. The closed end 72 has a protruding valve line protrusion 720. Due to the structural design of the piston body 7, the inner diameter of the port at the open end 71 of the piston 7 is similar to that of the valve line protrusion 720 at the closed end 72. Directly stacking the two would cause the valve line protrusion 720 to be compressed and damaged. The thermoforming device for the rubber-coated piston of this embodiment is additionally provided with a second feeding device 4. After each piston component 7 is placed into the forming channel 11 by the first feeding device 3, a spacer 8 is fed into the upper end of the forming channel 11 through the second feeding device 4, so that the two piston components 7 placed successively into the forming channel 11 are separated by the spacer 8. After the piston components 7 are separated by the spacer 8, downward pressure is applied by the pressure rod 21, and the valve line portion of the piston component 7 in the forming channel is not easily damaged by being squeezed by the adjacent piston components 7, which can effectively reduce the scrap rate of the thermoforming processing of the piston component 7.

[0047] In some embodiments, the spacer 8 can be made of a material with relatively low hardness, such as bakelite. After this type of spacer 8 separates the upper and lower piston members 7, even if the spacer 8 contacts the valve line portion of the piston member 7, the valve line portion will not be damaged. In other embodiments, the spacer 8 can also be made of a material with relatively high hardness, such as alloy metal. For this type of spacer 8, it should be considered to avoid the valve line portion of the piston member 7, that is, even if the spacer 8 placed in the forming channel 11 contacts the corresponding piston member 7, it should avoid the valve line of the piston member 7. Figure 6-Figure 9As shown, a spacer 8 structure is provided that can avoid the valve line protrusion 720 of the piston member 7. The spacer 8 is also cylindrical in shape. One end of the spacer 8 corresponding to the closed end 72 of the piston member 7 body has an annular stopper 81. The annular stopper 81 can be mounted outside the valve line protrusion 720 of the piston member 7 and abut against the outer edge of the closed end 72 of the piston member 7 body, thereby avoiding the valve line protrusion 720 of the piston member 7. On the other hand, the other end of the spacer 8 away from the annular stop 81 has an outwardly protruding limiting boss 82. When the piston member 7 and the spacer 8 are stacked up, the open end 71 of the piston member 7 is opposite to the end of the spacer 8 where the limiting boss 82 is located, wherein the open end 71 of the piston member 7 can be arranged outside the limiting boss 82 and form a limit in the radial direction with the limiting boss 82. The above structural design can avoid the problem of shaking or radial deviation of the spacers 8 and piston members 7 stacked in sequence during the downward movement of the forming channel 11. In some embodiments, in order to reduce production costs, the above-mentioned spacer 8 can be formed by setting a chamfer structure on the inner edge of the open end 71 of the piston member 7. Specifically, it can be formed by chamfering the unqualified piston member 7. In this way, the outer peripheral edge of the open end 71 of the piston member 7 constitutes the annular retaining portion 81 of the spacer 8 after the chamfer is set, and the valve line protrusion 720 of the piston member 7 can serve as the limiting boss 82 of the spacer 8 after normal wear or special material removal processing (making its radial dimension smaller than the radial dimension of the conventional valve line protrusion 720).

[0048] See also Figure 3 and Figure 4 The first feeding device includes a first feeding tray 31, a first conveyor belt 32, a first pushing rod 33 and a first robot 35.

[0049] The first feed tray 31 is used to place the pre-coated piston parts 7 and is arranged on the side of the processing platform 5 away from the thermoforming unit 1. The first feed tray 31 can adopt a conventional crawler-type feed tray, and the crawler part is driven by the corresponding first feeding motor 310 to transport the piston parts 7 placed thereon to the first conveyor belt 32. The first conveyor belt 32 is used to receive the piston parts 7 from the first feed tray 31 and convey the piston parts 7 to the side where the thermoforming unit 1 is located. The extension direction of the first feed belt, that is, the conveying direction, is basically perpendicular to the conveying direction of the first feed tray 31. Therefore, the first feed belt can be arranged along the edge extension direction of the processing platform 5, so that the operator can check the transmission status of the piston parts 7 on the first conveyor belt 32 or adjust the piston parts 7 on the first conveyor belt 32. The first pushing rod 33 can be specifically arranged at a section of the first conveyor belt 32 away from the first feeding tray 31, and is used to push the piston member 7 that is transported to the position on the first conveyor belt 32 out of the first conveyor belt 32 and transfer it to the first pre-loading platform 51, wherein the first pre-loading platform 51 is located on the side of the first conveyor belt 32 adjacent to the thermoforming unit 1, and the first pushing rod 33 is located on the side of the first conveyor belt 32 away from the thermoforming unit 1. The first pushing rod 33 can be driven by the first pushing cylinder 34, and the end of the first pushing rod 33 used to push the piston member 7 is set to an arc-shaped recess or a V-shaped groove structure so as to adapt to the cylindrical contour of the piston member 7 and smoothly push the piston member 7 away from the first conveyor belt 32. The first manipulator 35 is used to transfer the piston part 7 placed on the first pre-loading platform 51 to the upper end of the forming channel 11. Specifically, the first manipulator 35 includes a first cross frame, a first clamping jaw 351, a first clamping cylinder 352 for driving the first clamping jaw 351 to clamp and release, a first lifting cylinder 355, a first guide rail assembly 353 and a first transverse cylinder 354. The first cross frame is horizontally arranged on the processing platform 5, and its extension direction is basically perpendicular to the extension direction of the first conveyor belt 32. The first guide rail assembly 353 is arranged on the first cross frame and arranged along the extension direction of the first cross frame. The first clamping jaw 351 and the first clamping cylinder 352 are arranged on the first bracket, which is driven up and down by the first lifting cylinder 355. The unit module composed of the first bracket, the first lifting cylinder 355, the first clamping jaw 351 and the first clamping cylinder 352 is slidably arranged on the first cross frame 356 through the first guide rail assembly 353. The first transverse cylinder 354 is arranged on the first transverse frame 356 , and its power output end is connected to the above-mentioned unit module, which is used to drive the unit module to move back and forth between the first pre-loading platform 51 and the upper end of the molding shell 10 .

[0050] Continue to see Figure 3 and Figure 4 The second feeding device includes a second feeding tray 41, a second conveyor belt 42, a second pushing rod 43 and a second robot 45.

[0051] The second feed tray 41 is used to place the spacers 8 and is arranged on the side of the processing platform 5 away from the thermoforming unit 1, specifically, on the other side of the processing platform 5 opposite to the first feed tray 31. The second feed tray 41 can adopt a conventional crawler-type feed tray, and the crawler part is driven by the corresponding second feed motor 410 to transport the spacers 8 placed thereon to the second conveyor belt 42. The second conveyor belt 42 is used to receive the piston parts 7 from the second feed tray 41 and transport the spacers 8 to the side where the thermoforming unit 1 is located. The extension direction of the second feed belt, that is, the conveying direction, is basically perpendicular to the conveying direction of the second feed tray 41. Therefore, the second feed belt can be arranged along the edge extension direction of the processing platform 5, so that the operator can check the conveying status of the spacers 8 on the second conveyor belt 42 or adjust the spacers 8 on the second conveyor belt 42. The second pushing rod 43 can be specifically arranged at a section of the second conveyor belt 42 away from the second feeding tray 41, and is used to push the spacer 8 that is transferred to the position on the second conveyor belt 42 out of the second conveyor belt 42 and transfer it to the second pre-loading platform 52, wherein the second pre-loading platform 52 is located on the side of the second conveyor belt 42 adjacent to the thermoforming unit 1, and the second pushing rod 43 is located on the side of the second conveyor belt 42 away from the thermoforming unit 1. The second pushing rod 43 can be driven by the second pushing cylinder 44, and the end of the second pushing rod 43 used to push the spacer 8 is set to an arc-shaped notch or a V-shaped mouth structure so as to adapt to the cylindrical contour of the spacer 8 and smoothly push the spacer 8 away from the second conveyor belt 42. The second manipulator 45 is used to transfer the spacer 8 placed on the second pre-loading platform 52 to the upper end of the forming channel 11. Specifically, the second manipulator 45 includes a second cross frame, a second clamping jaw 451, a second clamping cylinder 452 for driving the second clamping jaw 451 to clamp and release, a second lifting cylinder 455, a second guide rail assembly 453 and a second transverse cylinder 454. The second cross frame is horizontally arranged on the processing platform 5, and its extension direction is basically perpendicular to the extension direction of the second conveyor belt 42. The second guide rail assembly 453 is arranged on the second cross frame 456 and arranged along the extension direction of the second cross frame 456. The second clamping jaw 451 and the second clamping cylinder 452 are arranged on the second bracket, which is driven up and down by the second lifting cylinder 455. The unit module composed of the second bracket, the second lifting cylinder 455, the second clamping jaw 451 and the second clamping cylinder 452 is slidably arranged on the second cross frame through the second guide rail assembly. The second transverse cylinder 454 is arranged on the second transverse frame, and its power output end is connected to the above-mentioned unit module, which is used to drive the unit module to move back and forth between the second pre-loading platform 52 and the upper end of the molding shell 10.

[0052] See also Figure 4To facilitate the sequential loading of the piston member 7 and the spacer 8, the first pre-loading platform 51 and the second pre-loading platform 52 are respectively arranged on the processing platform 5, in front of and behind the location where the thermoforming unit 1 forms the shell 10. To achieve a more rational spatial layout and reduce floor space, the first and second conveyor trays are respectively arranged on the left and right sides of the location where the thermoforming unit 1 forms the shell 10. The first conveyor belt 32 is arranged at the front edge of the processing platform 5, located on the left, and the second conveyor belt 42 is arranged at the rear edge of the processing platform 5, located on the right.

[0053] A first proximity switch assembly 61 for detecting whether the piston member 7 on the first conveyor belt 32 has been delivered to its proper position is provided on the processing platform 5 at the conveying end of the first conveyor belt 32 (i.e., adjacent to the end position of the first feeding push rod). The first proximity switch assembly 61 is electrically connected to the controller, so that after the first proximity switch assembly 61 detects that the piston member 7 on the first conveyor belt 32 has been delivered to its proper position, the controller controls the first push rod 33 to move, thereby pushing the piston member 7 on the first conveyor belt 32 to the first pre-loading platform 51. Similarly, a second proximity switch assembly 62 for detecting whether the spacer 8 on the second conveyor belt 42 has been delivered to its proper position is provided on the processing platform 5 at the conveying end of the second conveyor belt 42 (i.e., adjacent to the end position of the first feeding push rod). The second proximity switch assembly 62 is electrically connected to the controller, so that after the second proximity switch assembly 62 detects that the spacer 8 on the second conveyor belt 42 has been delivered to its proper position, the controller controls the second push rod 43 to move, thereby pushing the spacer 8 on the second conveyor belt 42 to the second pre-loading platform 52.

[0054] The working process of the thermoforming device for the rubber-coated piston of this embodiment is as follows:

[0055] The first feeding tray 31 transfers the pre-coated piston part 7 set thereon to the first conveyor belt 32, and the first conveyor belt 32 transfers it to the side where the first pushing rod 33 is located. When the first proximity switch component 61 detects that the piston part 7 on the first conveyor belt 32 is transferred into place, the controller controls the first pushing rod 33 to move, push the piston part 7 on the first conveyor belt 32 to the first pre-loading platform 51, and then retract it. The first manipulator 35 moves to transfer the piston part 7 placed on the first pre-loading platform 51 to the upper end of the forming channel 11 (the corresponding proximity switch component can also identify whether the piston part 7 is placed in place at the upper end of the forming channel 11). Then, the pressure rod 21 moves downward under the drive of the first driving mechanism 22, applies downward pressure to the piston part 7 placed at the upper end of the forming channel 11, moves the piston part 7 downward by a set distance, and then retracts it upward to the initial position. During this process, the second feed tray 41 transfers the spacer 8 set thereon to the second conveyor belt 42, and is transported by the second conveyor belt 42 to the side where the second pusher rod 43 is located. When the second proximity switch assembly 62 detects that the spacer 8 on the second conveyor belt 42 is transferred into place, the controller controls the second pusher rod 43 to move, and pushes the piston part 7 on the second conveyor belt 42 to the second pre-loading platform 52, and then retracts. After the push rod moves the piston 7 downward a set distance and resets it, the second manipulator 45 moves to transfer the spacer 8 placed on the second pre-loading platform 52 to the upper end of the forming channel 11 (the corresponding proximity switch component can also identify whether the piston 7 is placed in place at the upper end of the forming channel 11). The pressure rod 21 moves downward under the drive of the first drive mechanism 22, and applies downward pressure to the spacer 8 placed at the upper end of the forming channel 11, moving the spacer 8 downward a set distance, and then returning it upward to the initial position. This cycle is repeated in sequence, so that the piston 7 and the spacer 8 are stacked and placed in the forming channel 11 in sequence.

Claims

1. A thermoforming device for a rubber-coated piston, comprising: A thermoforming unit (1) comprises a forming shell (10) having a vertically extending forming channel (11), wherein the upper end of the forming channel (11) is a feed port, and the lower end is a discharge port; A pressure rod assembly (2) includes a pressure rod (21) located above the forming channel (11) and opposite to the upper end of the forming channel (11), and the pressure rod (21) is driven by a first driving mechanism (22) to move up and down; A first feeding device (3) is used to feed the pre-encapsulated piston member (7) into the upper end of the forming channel (11); It is characterized by also including: The second feeding device (4) is configured to: after the first feeding device (3) places each piston member (7) into the forming channel (11), a spacer (8) is fed into the upper end of the forming channel (11), so that the two piston members (7) placed successively into the forming channel (11) are separated by the spacer (8).

2. The thermoforming device for the rubber-coated piston according to claim 1, characterized in that: The main body of the piston member (7) is cylindrical as a whole, and includes an open end (71) and a closed end (72). The end surface of the closed end (72) has a valve line protrusion (720) protruding outward along the axial direction. The position where the spacer (8) placed in the molded channel (11) abuts against the corresponding piston member (7) avoids the valve line protrusion (720) of the piston member (7).

3. The thermoforming device for the rubber-coated piston according to claim 2, characterized in that: An end portion of the spacer (8) corresponding to the closed end (72) of the piston member (7) body has an annular stop portion (81) that can be sleeved outside the valve line protrusion (720) of the piston member (7) and abut against the outer peripheral edge portion of the closed end (72) of the piston member (7) body.

4. The thermoforming device for the rubber-coated piston according to claim 3, characterized in that: The other end of the spacer (8) away from the annular retaining portion (81) has an outwardly protruding limiting boss (82), and the open end (71) of the piston (7) can be sleeved outside the limiting boss (82) and form a limit in the radial direction with the limiting boss (82).

5. The thermoforming device for the rubber-coated piston according to claim 4, characterized in that: The spacer (8) is formed by arranging a chamfered structure at the inner edge of the open end (71) of the piston (7).

6. The thermoforming device for rubber-coated pistons according to any one of claims 1 to 5, characterized in that: The first feeding device comprises: A first feeding tray (31) is used to place the pre-encapsulated piston member (7); a first conveyor belt (32) for receiving the piston member (7) from the first feeding tray (31) and conveying the piston member (7) to the side where the thermoforming unit (1) is located; A first push rod (33) is used to push the piston member (7) that has been delivered to a position on the first conveyor belt (32) out of the first conveyor belt (32) and transfer it to the first pre-loading platform (51); A first manipulator (35) is used to transfer the piston member (7) placed on the first pre-loading platform (51) to the upper end of the molding channel (11); The second feeding device comprises: A second feeding tray (41) for placing the spacer (8); a second conveyor belt (42) for receiving the spacers (8) from the second feeding tray (41) and conveying the spacers (8) to the side where the thermoforming unit (1) is located; A second push rod (43) is used to push the piston member (7) that has been delivered to the position on the second conveyor belt (42) out of the second conveyor belt (42) and transfer it to the second pre-loading platform (52); The second manipulator (45) is used to transfer the piston member (7) placed at the second pre-loading station to the upper end of the forming channel (11).

7. The thermoforming device for the rubber-coated piston according to claim 6, characterized in that: The first pre-loading platform (51) is located on a side of the first conveyor belt (32) adjacent to the thermoforming unit (1), the first push rod (33) is located on a side of the first conveyor belt (32) away from the thermoforming unit (1), the second pre-loading platform (52) is located on a side of the second conveyor belt (42) adjacent to the thermoforming unit (1), and the second push rod (43) is located on a side of the second conveyor belt (42) away from the thermoforming unit (1).

8. The thermoforming device for the rubber-coated piston according to claim 7, characterized in that: The first pre-loading platform (51) and the second pre-loading platform (52) are respectively arranged on both sides of the position where the forming shell (10) of the thermoforming unit (1) is located.

9. The thermoforming device for the rubber-coated piston according to claim 6, characterized in that Also includes: a first proximity switch assembly (61) for detecting whether the piston member (7) on the first conveyor belt (32) has been delivered to its proper position, the first proximity switch assembly (61) being electrically connected to a controller, so that the controller controls the first push rod (33) to move after the first proximity switch assembly (61) detects that the piston member (7) on the first conveyor belt (32) has been delivered to its proper position; as well as A second proximity switch assembly (62) is provided for detecting whether the spacer (8) on the second conveyor belt (42) has been delivered to its proper position. The second proximity switch assembly (62) is electrically connected to a controller, so that the controller controls the second push rod (43) to move after the second proximity switch assembly (62) detects that the spacer (8) on the second conveyor belt (42) has been delivered to its proper position.

10. The thermoforming device for the rubber-coated piston according to claim 6, characterized in that: It also includes a processing platform (5), on which the thermoforming unit (1), the pressure rod assembly (2), the first feeding device (3) and the second feeding device (4) are all arranged, and the first feeding device (3) and the second feeding device (4) are symmetrically arranged on the processing platform (5) with respect to the thermoforming unit (1).

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