Liquid mold matching hydraulic mold for forming metal bipolar plate

Abstract

The utility model discloses a liquid mould matching hydraulic mould for forming a metal bipolar plate, which relates to the technical field of hydraulic moulds and comprises an upper mould plate, a plurality of sliding shafts are fixedly connected to the inner edge of the upper mould plate, a water channel is arranged at the center of the ground of the upper mould plate, and the bottom end of the outer wall of each sliding shaft penetrates through one side of the top surface of a lower mould plate. One side of the interior of the lower mold plate is slidably connected with the bottom end of the outer wall of the sliding shaft, a metal plate is fixedly connected to the top end of the interior of the lower mold plate, a control motor is fixedly connected to one side of the outer wall of the lower mold plate, and the upper mold plate is slidably connected with the top of the lower mold plate through the output end of the control motor; the metal plate forming device ensures that a metal plate is accurately formed into a required part under the action of high-pressure liquid, effectively improves the stability and precision of the metal plate in the forming process through the mutual matching among the water channel, the positioning bolt and the threaded rod, simultaneously ensures the positioning and fixing of the metal plate in the forming process, and improves the production efficiency. And the forming defect caused by non-uniform displacement or pressure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic molds, in particular to a liquid-mold hydraulic mold for forming metal bipolar plates. Background Art

[0002] The liquid-to-mold hydraulic mold for metal bipolar plate molding is a device specially used for manufacturing metal bipolar plates. It uses liquid as the medium to transmit pressure. Through the relative movement of the upper and lower molds, the metal material undergoes plastic deformation under high pressure to obtain the required shape and size. Due to the incompressibility of the liquid, the accuracy of the mold can be guaranteed not to be affected under high pressure, thereby ensuring the accuracy of the product. The liquid-to-mold hydraulic mold adopts automated control, which can achieve fast and continuous production and greatly improve production efficiency.

[0003] At present, the existing hydraulic molds usually use metal punches and concave dies to stamp each other when working, and the metal plates are extremely thin. They are prone to deformation, wrinkles or breaks during the stamping process, which will affect the quality and consistency of the product. In view of this, we provide a liquid-mold hydraulic mold for metal bipolar plate molding. Utility Model Content

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a liquid-mold hydraulic mold for forming a metal bipolar plate.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid-mold hydraulic mold for forming metal bipolar plates, comprising an upper mold, a plurality of sliding shafts are fixedly connected at the inner edge of the upper mold, and a water channel is opened at the center of the ground of the upper mold, a water inlet is opened on the outer wall of one side of the upper mold, and the water inlet and the water channel are interconnected, the bottom center of the upper mold is slidably connected to the lower mold through the sliding shaft, and the sliding shaft is located at the inner edge of the lower mold, the bottom end of the outer wall of the sliding shaft passes through one side of the top surface of the lower mold, and one side of the inner part of the lower mold is slidably connected to the bottom end of the outer wall of the sliding shaft, a metal plate is fixedly connected to the top of the inner part of the lower mold, and a control motor is fixedly connected to one side of the outer wall of the lower mold, and the upper mold is slidably connected to the top of the lower mold through the output end of the control motor.

[0006] As mentioned above, a plurality of positioning holes are opened at the top of the inner part of the lower template, and positioning grooves are opened on both sides of the inner wall of the positioning hole. A positioning bolt is fixedly connected to the center of the positioning hole, and the positioning bolt is located at the inner edge of the metal plate.

[0007] As mentioned above, the center of the outer wall of the positioning bolt passes through one side of the top surface of the metal plate, and the center of the outer wall of the positioning bolt is fixedly connected to one side of the inside of the metal plate. A plurality of positioning springs are fixedly connected to the inner center of the positioning bolt, and an asymmetric positioning block is fixedly connected to the outer wall of one end of the positioning spring.

[0008] As mentioned above, the outer wall of the asymmetric positioning block, which is away from the positioning bolt, is in contact with and in conflict with the inner wall of the positioning groove.

[0009] As mentioned above, the bottom end of the lower template is rotatably connected to a driving rod, and both ends of the outer wall of the driving rod are fixedly connected to a plurality of driving teeth. The outer wall of one end of the driving rod passes through one side of the inner wall of the lower template and is fixedly connected to the output end of the control motor.

[0010] As mentioned above, both ends of the top of the driving rod are rotatably connected to a group of corresponding threaded rods through driving teeth, and the bottom end of the outer wall of the threaded rod is fixedly connected to a transmission tooth, and one side of the bottom of the transmission tooth and one side of the top of the driving tooth are meshed and rotatably connected with each other.

[0011] As mentioned above, threaded sleeves are fixedly connected on both sides of the upper template, and the threaded sleeve is located at the top of the outer wall of the threaded rod. The top of the outer wall of the threaded rod is connected through the center of the bottom surface of the threaded sleeve, and the top of the outer wall of the threaded rod is rotatably connected to the inner center of the threaded sleeve through a thread.

[0012] Compared with the prior art, the liquid-to-mold hydraulic mold for forming a metal bipolar plate has the following advantages:

[0013] Beneficial effects:

[0014] 1. After the metal plate is placed in the groove at the top of the lower template, the asymmetric positioning blocks on both sides of the positioning bolt are aligned with the positioning grooves on both sides of the inner wall of the positioning hole. When the asymmetric positioning block contacts the outer wall at the top of the metal plate, the asymmetric positioning block is pushed by the metal plate and the inner wall of the positioning hole to be placed inside the positioning bolt. When the asymmetric positioning block is aligned with the positioning groove, the asymmetric positioning block is pushed to the inner wall of the positioning groove by the positioning spring, so that one side of the outer wall of the asymmetric positioning block and the top of the inner wall of the positioning groove are mutually engaged, and the metal plate can be fixed to the top of the inner part of the lower template, thereby the asymmetric positioning block and the positioning groove cooperate with each other. The metal plate is precisely positioned and securely connected to the lower template, and the metal plate is always kept in the correct position during subsequent processing. When the metal plate is processed, the outer wall of one side of the asymmetric positioning block fits the outer wall of the positioning bolt. The positioning bolt is rotated clockwise to make the asymmetric positioning block contact the inner wall of the positioning hole. The asymmetric positioning block is returned to the inside of the positioning bolt, and the asymmetric positioning block is separated from the inner wall of the positioning groove. The positioning bolt can be directly pulled out upwards to pick up the metal plate, thereby effectively simplifying the positioning and disassembly steps of the metal plate and improving the loading and unloading efficiency of the metal plate.

[0015] 2. When the utility model fixes the metal plate at the center of the top surface of the lower template, the control motor is turned on, and the output end of the control motor drives the driving rod to rotate. The driving rod can effectively drive the threaded rods at both ends of its top at the same time through the driving teeth, so that the threaded rods on both sides of the lower template rotate inward at the same time. When the threaded rod rotates, the threaded rod drives the threaded sleeve and the upper template through the outer wall thread to slide vertically downward, and after the outer walls of the corresponding surfaces of the upper template and the lower template are tightly attached, high-pressure liquid is injected into the water inlet. The high-pressure liquid applies pressure to the top surface of the metal plate through the water channel, so that the metal plate fits with the concave film in the center of the top surface of the lower template and is formed, thereby ensuring that the metal plate is accurately formed into the required parts under the action of the high-pressure liquid, and the mutual cooperation between the water channel, the positioning bolt and the threaded rod effectively improves the stability and accuracy of the metal plate in the forming process, and at the same time ensures the positioning and fixation of the metal plate in the forming process, avoiding forming defects caused by displacement or uneven pressure.

[0016] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a partial cross-sectional three-dimensional structural schematic diagram of the upper template of the utility model;

[0019] Figure 3 It is a partial cross-sectional three-dimensional structural schematic diagram of the lower template of the utility model;

[0020] Figure 4 For this utility model Figure 3 Schematic diagram of the stereostructure of A;

[0021] Figure 5 For this utility model Figure 3 Schematic diagram of the three-dimensional structure of B;

[0022] Figure 6 It is a partial three-dimensional structural schematic diagram of the positioning bolt of the utility model;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the upper template and the lower template of the utility model.

[0024] In the figure: 1. upper template; 101. water channel; 102. water inlet; 2. sliding shaft; 201. lower template; 202. metal plate; 203. positioning hole; 204. positioning groove; 205. positioning bolt; 206. positioning spring; 207. asymmetric positioning block; 3. control motor; 301. driving rod; 302. driving tooth; 303. threaded rod; 304. transmission tooth; 305. threaded sleeve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-7 As shown, the utility model provides a technical solution: a liquid-mold hydraulic mold for forming a metal bipolar plate, comprising an upper mold plate 1, a plurality of sliding shafts 2 are fixedly connected at the inner edge of the upper mold plate 1, and a waterway 101 is opened at the center of the ground of the upper mold plate 1, a water inlet 102 is opened on the outer wall of one side of the upper mold plate 1, and the water inlet 102 and the waterway 101 are interconnected, a lower mold plate 201 is slidably connected to the bottom center of the bottom of the upper mold plate 1 through a sliding shaft 2, and the sliding shaft 2 is located at the inner edge of the lower mold plate 201, the bottom end of the outer wall of the sliding shaft 2 passes through one side of the top surface of the lower mold plate 201, and one side of the inner part of the lower mold plate 201 is slidably connected to the bottom end of the outer wall of the sliding shaft 2, a metal plate 202 is fixedly connected to the top of the inner part of the lower mold plate 201, and a control motor 3 is fixedly connected to one side of the outer wall of the lower mold plate 201, and the upper mold plate 1 is slidably connected to the top of the lower mold plate 201 through the output end of the control motor 3.

[0027] After placing the metal plate 202 in the top groove of the lower template 201, align the asymmetric positioning blocks 207 on both sides of the positioning bolt 205 with the positioning grooves 204 on both sides of the inner wall of the positioning hole 203, and insert it downward into the positioning hole 203 through the opening on the top surface of the metal plate 202. When the asymmetric positioning block 207 contacts the top outer wall of the metal plate 202, the asymmetric positioning block 207 is pushed into the positioning bolt 205 by the metal plate 202 and the inner wall of the positioning hole 203. When the asymmetric positioning block 207 is aligned with the positioning groove 204, the asymmetric positioning block 207 is lost. Remove the supporting force from the metal plate 202 and the inner wall of the positioning hole 203, the asymmetric positioning block 207 is pushed to the inner wall of the positioning groove 204 by the positioning spring 206, so that one side of the outer wall of the asymmetric positioning block 207 is engaged with the top of the inner wall of the positioning groove 204, and the metal plate 202 can be fixed to the top of the inner part of the lower template 201. When the metal plate 202 is fixed to the center of the top surface of the lower template 201, the control motor 3 is turned on. Since the driving teeth 302 and the transmission teeth 304 are meshed with each other, when the output end of the control motor 3 drives the driving rod 301 to rotate, the driving rod 301 can The threaded rods 303 at both ends of the top are driven simultaneously by the driving teeth 302, so that the threaded rods 303 on both sides of the lower template 201 rotate inward at the same time, and the upper template 1 fixes multiple sliding shafts 2 at the inner edge, so that the sliding shafts 2 penetrate the inner edge of the lower template 201, and the movement trajectory of the lower template 201 is restricted. When the threaded rods 303 rotate, the threaded rods 303 drive the threaded sleeves 305 and the upper template 1 to slide vertically downward through the outer wall threads, and after the corresponding outer walls of the upper template 1 and the lower template 201 are tightly attached, the upper template 1 and the lower template 201 are pushed into the water inlet 102. The high-pressure liquid is injected into the lower mold 201, and the high-pressure liquid applies pressure to the top surface of the metal plate 202 through the water channel 101, so that the metal plate 202 fits with the concave film at the center of the top surface of the lower mold 201 and is formed, thereby ensuring that the metal plate 202 is accurately formed into the required parts under the action of the high-pressure liquid. The mutual cooperation among the water channel 101, the positioning bolt 205 and the threaded rod 303 effectively improves the stability and accuracy of the metal plate 202 during the forming process, and at the same time ensures the positioning and fixation of the metal plate 202 during the forming process, avoiding forming defects caused by displacement or uneven pressure.

[0028] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a plurality of positioning holes 203 are provided at the top end inside the lower template 201, and positioning grooves 204 are provided on both sides of the inner wall of the positioning hole 203, a positioning bolt 205 is fixedly connected to the inner center of the positioning hole 203, and the positioning bolt 205 is located at the inner edge of the metal plate 202, the center of the outer wall of the positioning bolt 205 passes through one side of the top surface of the metal plate 202, and the center of the outer wall of the positioning bolt 205 is fixedly connected to one side of the inner part of the metal plate 202, a plurality of positioning springs 206 are fixedly connected to the inner center of the positioning bolt 205, and an asymmetric positioning block 207 is fixedly connected to the outer wall of one end of the positioning spring 206, and the outer wall of the asymmetric positioning block 207 is away from the side of the positioning bolt 205 and is in contact with the inner wall of the positioning groove 204.

[0029] After placing the metal plate 202 in the top groove of the lower template 201, align the asymmetric positioning blocks 207 on both sides of the inside of the positioning bolt 205 with the positioning grooves 204 on both sides of the inner wall of the positioning hole 203, and insert them downward into the positioning hole 203 through the opening on the top surface of the metal plate 202. When the asymmetric positioning block 207 contacts the outer wall at the top of the metal plate 202, the asymmetric positioning block 207 is pushed into the inside of the positioning bolt 205 by the metal plate 202 and the inner wall of the positioning hole 203. When the asymmetric positioning block 207 is aligned with the positioning groove 204, since the asymmetric positioning block 207 loses the supporting force from the metal plate 202 and the inner wall of the positioning hole 203, the asymmetric positioning block 207 is pushed to the inner wall of the positioning groove 204 by the positioning spring 206, so that one side of the outer wall of the asymmetric positioning block 207 is mutually engaged with the top of the inner wall of the positioning groove 204, and the metal plate 202 can be fixed. At the top of the lower template 201, the asymmetric positioning block 207 and the positioning groove 204 cooperate with each other to achieve precise positioning and firm connection between the metal plate 202 and the lower template 201 and ensure that the metal plate 202 always remains in the correct position during the subsequent processing. When the processing of the metal plate 202 is completed, the outer wall of one side of the asymmetric positioning block 207 fits with the outer wall of the positioning bolt 205. The positioning bolt 205 is rotated clockwise, so that the asymmetric positioning block 207 is resisted by the inner wall of the positioning hole 203, and the asymmetric positioning block 207 is returned to the inside of the positioning bolt 205, so that the asymmetric positioning block 207 is separated from the inner wall of the positioning groove 204, and the positioning bolt 205 can be directly pulled out upwards to pick up the metal plate 202, thereby effectively simplifying the positioning and disassembly steps of the metal plate 202 and improving the loading and unloading efficiency of the metal plate 202.

[0030] like Figure 1 and Figure 7As shown, a driving rod 301 is rotatably connected to the bottom end of the lower template 201, and a plurality of driving teeth 302 are fixedly connected to the two ends of the outer wall of the driving rod 301, the outer wall of one end of the driving rod 301 penetrates one side of the inner wall of the lower template 201 and is fixedly connected to the output end of the control motor 3, and a group of corresponding threaded rods 303 are rotatably connected to the two ends of the top of the driving rod 301 through the driving teeth 302, and a transmission tooth 304 is fixedly connected to the bottom end of the outer wall of the threaded rod 303, and the bottom side of the transmission tooth 304 is meshed with and rotatably connected to the top side of the driving tooth 302, and the threaded sleeve 305 is fixedly connected to both sides of the upper template 1, and the threaded sleeve 305 is located at the top end of the outer wall of the threaded rod 303, the top end of the outer wall of the threaded rod 303 is connected to the center of the bottom surface of the threaded sleeve 305, and the top end of the outer wall of the threaded rod 303 is rotatably connected to the inner center of the threaded sleeve 305 through a thread.

[0031] When the metal plate 202 is fixed at the center of the top surface of the lower template 201, the control motor 3 is turned on. Since the driving teeth 302 and the transmission teeth 304 are meshed with each other, when the output end of the control motor 3 drives the driving rod 301 to rotate, the driving rod 301 can effectively drive the threaded rods 303 at both ends of its top through the driving teeth 302, so that the threaded rods 303 on both sides of the lower template 201 rotate inward at the same time, and the upper template 1 fixes multiple sliding shafts 2 at the inner edge so that the sliding shafts 2 pass through the inner edge of the lower template 201, thereby limiting the movement trajectory of the lower template 201. When the threaded rod 303 rotates, the threaded rod 303 drives the threaded sleeve 305 and the upper template 1 through the outer wall thread. , slide vertically downward, and make the corresponding outer walls of the upper template 1 and the lower template 201 close to each other, and then inject high-pressure liquid into the water inlet 102. The high-pressure liquid applies pressure to the top surface of the metal plate 202 through the water channel 101, so that the metal plate 202 fits with the concave film in the center of the top surface of the lower template 201 and is formed, thereby ensuring that the metal plate 202 is accurately formed into the required parts under the action of the high-pressure liquid. Through the mutual cooperation between the water channel 101, the positioning bolt 205 and the threaded rod 303, the stability and accuracy of the metal plate 202 in the forming process are effectively improved, and at the same time, the positioning and fixation of the metal plate 202 in the forming process are guaranteed, avoiding forming defects caused by displacement or uneven pressure.

[0032] Working principle: After placing the metal plate 202 in the top groove of the lower template 201, align the asymmetric positioning blocks 207 on both sides of the positioning bolt 205 with the positioning grooves 204 on both sides of the inner wall of the positioning hole 203, and insert it downward into the positioning hole 203 through the opening on the top surface of the metal plate 202. When the asymmetric positioning block 207 contacts the outer wall of the top of the metal plate 202, the asymmetric positioning block 207 is pushed into the inside of the positioning bolt 205 by the metal plate 202 and the inner wall of the positioning hole 203. When the positioning block 207 is aligned with the positioning groove 204, since the asymmetric positioning block 207 loses the support force from the metal plate 202 and the inner wall of the positioning hole 203, the asymmetric positioning block 207 is pushed to the inner wall of the positioning groove 204 by the positioning spring 206, so that one side of the outer wall of the asymmetric positioning block 207 and the top of the inner wall of the positioning groove 204 are mutually engaged, and the metal plate 202 can be fixed to the top inside the lower template 201. When the metal plate 202 is fixed to the center of the top surface of the lower template 201, the control motor 3 is turned on. Since the driving teeth 302 and the transmission teeth 304 are meshed with each other, when the output end of the control motor 3 drives the driving rod 301 to rotate, the driving rod 301 can effectively drive the threaded rods 303 at both ends of its top at the same time through the driving teeth 302, so that the threaded rods 303 on both sides of the lower template 201 rotate inward at the same time, and the upper template 1 fixes multiple sliding shafts 2 at the inner edge so that the sliding shafts 2 penetrate the inner edge of the lower template 201, thereby limiting the movement trajectory of the lower template 201. When the threaded rod 303 rotates, the threaded rod 303 drives the threaded sleeve 305 and the upper template 1 through the outer wall thread to slide vertically downward, and after the corresponding outer walls of the upper template 1 and the lower template 201 are tightly attached, high-pressure liquid is injected into the water inlet 102, and the high-pressure liquid applies pressure to the top surface of the metal plate 202 through the water channel 101, so that the metal plate 202 fits with the concave film in the center of the top surface of the lower template 201 and is formed, thereby ensuring that the metal plate 202 is accurately formed into the required parts under the action of the high-pressure liquid.

[0033] It should be noted that, in this article, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", and "connected" should be understood in a broad sense. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "connected" can be a direct connection, an indirect connection through an intermediate medium, or a connection between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid-to-mold hydraulic mold for forming a metal bipolar plate, comprising an upper mold plate (1), characterized in that: A plurality of sliding shafts (2) are fixedly connected at the inner edge of the upper template (1), and a water channel (101) is provided at the center of the ground of the upper template (1). A water inlet (102) is provided on the outer wall of one side of the upper template (1), and the water inlet (102) and the water channel (101) are interconnected. The bottom center of the upper template (1) is slidably connected to the lower template (201) through the sliding shaft (2), and the sliding shaft (2) is located at the inner edge of the lower template (201). The bottom end of the outer wall of the sliding shaft (2) passes through one side of the top surface of the lower template (201), and one side of the inner part of the lower template (201) is slidably connected to the bottom end of the outer wall of the sliding shaft (2). The top end of the lower template (201) is fixedly connected to a metal plate (202), and one side of the outer wall of the lower template (201) is fixedly connected to a control motor (3). The upper template (1) is slidably connected to the top of the lower template (201) through the output end of the control motor (3).

2. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 1, characterized in that: The top of the lower template (201) is provided with a plurality of positioning holes (203), and both sides of the inner wall of the positioning hole (203) are provided with positioning grooves (204). A positioning bolt (205) is fixedly connected to the center of the positioning hole (203), and the positioning bolt (205) is located at the inner edge of the metal plate (202).

3. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 2, characterized in that: The center of the outer wall of the positioning bolt (205) passes through one side of the top surface of the metal plate (202), and the center of the outer wall of the positioning bolt (205) is fixedly connected to one side of the interior of the metal plate (202). The inner center of the positioning bolt (205) is fixedly connected to a plurality of positioning springs (206), and the outer wall of one end of the positioning spring (206) is fixedly connected to an asymmetric positioning block (207).

4. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 3, characterized in that: The outer wall of the asymmetric positioning block (207) at a side away from the positioning bolt (205) is in contact with and in conflict with the inner wall of the positioning groove (204).

5. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 1, characterized in that: The bottom end of the lower template (201) is rotatably connected to a driving rod (301), and both ends of the outer wall of the driving rod (301) are fixedly connected to a plurality of driving teeth (302), and the outer wall of one end of the driving rod (301) penetrates one side of the inner wall of the lower template (201) and is fixedly connected to the output end of the control motor (3).

6. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 5, characterized in that: Both ends of the top of the driving rod (301) are rotatably connected to a group of corresponding threaded rods (303) through driving teeth (302), and the bottom end of the outer wall of the threaded rod (303) is fixedly connected to a transmission tooth (304), and the bottom side of the transmission tooth (304) and the top side of the driving tooth (302) are meshed with each other and rotatably connected.

7. The liquid-to-mold hydraulic mold for forming a metal bipolar plate according to claim 6, characterized in that: The upper mold plate (1) has threaded sleeves (305) fixedly connected to both sides thereof, and the threaded sleeves (305) are located at the top of the outer wall of the threaded rod (303), the top of the outer wall of the threaded rod (303) is connected through the center of the bottom surface of the threaded sleeve (305), and the top of the outer wall of the threaded rod (303) is rotatably connected to the inner center of the threaded sleeve (305) via a thread.

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