Mounting structure of core rod of a molding press

Abstract

The application discloses a lower core rod mounting structure of a forming press, and relates to the field of lower core rod mounting. The lower core rod mounting structure comprises a limiting assembly, a clamping assembly and a control assembly. The clamping assembly is slidably connected with the limiting assembly. One end of the clamping assembly is engagedly connected with one end of the control assembly. A guide gap is reserved between a plurality of limiting assemblies. The application is convenient for connecting lower core rods of different sizes. After the lower core rod is clamped by the clamping plate, the driven slider, the first movable block and the second movable block can be continuously moved to adjust the clamping force, so that different fixing effects are obtained, the lower core rod is prevented from being damaged, and the clamping assembly only needs to move any one of the driven slider, the first movable block and the second movable block to drive the overall structure to change. Compared with the fixing mode of the bolt, the operation difficulty is not increased too much.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core rod installation, in particular to a core rod installation structure of a forming press. BACKGROUND

[0002] The core rod of the press refers to a tool used to support and position the workpiece during the operation of the press. The core rod is usually made of solid metal material and has a certain length and diameter. The core rod is generally installed through a core rod seat, which is a device fixed on the press and usually consists of a seat body and a clamping mechanism.

[0003] In the prior art, such as Chinese patent No. CN106270521A, "a powder metallurgy press core rod seat rotating mechanism", including a rack and a lower punch assembly, the lower punch assembly includes a core rod seat, a core rod transition pad, a connecting screw, a core rod mounting pad, a core rod and a core rod gland, the core rod seat is fixedly connected with the rack, the middle axis of the core rod transition pad is provided with a shaft hole, the connecting screw includes a threaded section, a smooth section and a screw head, the connecting screw passes through the shaft hole and is fixedly connected with the center point of the core rod seat, the bottom end of the core rod mounting pad is provided with a cavity capable of accommodating the screw head, the core rod mounting pad is fixedly connected with the core rod transition pad, and the core rod is fixedly connected with the core rod mounting pad through the core rod gland.

[0004] However, in the prior art, when the core rod is installed in the core rod seat, it is usually fixed by bolts. However, the bolt fixing method only corresponds to core rods of fixed size and cannot adjust the size or the fixing force, so it is easy to cause the core rod to be too large to match the core rod seat, and the fixing force may be too large during actual installation. SUMMARY

[0005] The present application aims to provide a core rod installation structure of a forming press to solve the problem of excessive fixing force during actual installation.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a core rod installation structure of a forming press, comprising a limiting assembly, a clamping assembly and a control assembly, the clamping assembly is slidably connected with the limiting assembly, one end of the clamping assembly is engagedly connected with one end of the control assembly, and a guide gap is reserved between a plurality of limiting assemblies.

[0007] The clamping assembly comprises a driven slider, a first movable block, a square connecting plate and a second movable block, the driven slider, the first movable block and the second movable block are all rotatably provided with bent connecting rods, the top of the driven slider, the first movable block and the second movable block is fixedly provided with a clamping plate, the other end of the four bent connecting rods is rotatably connected to the four corners of the square connecting plate, two driven sliders are located on the two sides of the square connecting plate, and the first movable block and the second movable block are located on the other two sides of the square connecting plate.

[0008] The bottom of the first movable block and the second movable block is fixedly provided with an adapter rod, the first transmission rod is fixedly installed on the adapter rod at the bottom of the first movable block, the second transmission rod is fixedly installed on the adapter rod at the bottom of the second movable block, and the first transmission rod and the second transmission rod are both fixedly provided with a toothed plate on one side.

[0009] The control assembly comprises a butt joint gear, a vertical rotating rod and a hollow cylinder, the vertical rotating rod is rotatably installed in the hollow cylinder, the butt joint gear is fixedly installed at the top of the vertical rotating rod, the butt joint gear is in meshing connection with the toothed plate, two toothed plates are located on the two sides of the butt joint gear, and the top of the vertical rotating rod is rotatably connected to the bottom of the square connecting plate.

[0010] Preferably, the bottom of the hollow cylinder is fixedly connected with a bearing bottom plate, the other end of the bearing bottom plate is fixedly provided with a hollow support column, and the hollow cylinder and the hollow support column are respectively located at the two ends of the bearing bottom plate.

[0011] Preferably, the upper surface of the bearing bottom plate is fixedly provided with a limiting block, the main transmission shaft is rotatably installed in the limiting block, and the two ends of the main transmission shaft are rotatably connected to the inside of the hollow cylinder and the hollow support column.

[0012] Preferably, the two ends of the main transmission shaft are both fixedly provided with a driven bevel gear, the outer wall of the vertical rotating rod is fixedly provided with a first bevel gear, and the first bevel gear is in meshing connection with one driven bevel gear.

[0013] Preferably, the inside of the hollow support column is rotatably connected with a steering shaft, the outer wall of the steering shaft is fixedly provided with a second bevel gear, and the second bevel gear is in meshing connection with the other driven bevel gear.

[0014] Preferably, the top of the steering shaft is fixedly provided with a rotating disc, the second bevel gear, the driven bevel gear and the outside of the hollow support column are provided with a protective cover.

[0015] Preferably, the upper surface of the square connecting plate is fixedly provided with a positioning circular block, and the driven slider, the first movable block and the second movable block are all located in the guiding gap.

[0016] Preferably, the limiting assembly comprises a support plate, a bearing plate, a limiting plate and a positioning plate, the bearing plate is fixedly installed on the top of the support plate, the limiting plate is fixedly installed on the lower surface of the bearing plate, and the positioning plate is fixedly installed on one side of the support plate.

[0017] Preferably, one side of the upper bent connecting rod of the driven slider is lapped on one side of the limiting plate, and the limiting plate is located on one side of the driven slider.

[0018] Preferably, the positioning block is rotatably connected with the bearing plate, the first transmission rod and the second transmission rod are slidably connected with the positioning plate, and guide convex strips are fixedly installed on the outer walls of the first transmission rod and the second transmission rod.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1、In the present application, the structure for installing the lower core rod is composed of the limiting assembly and the clamping assembly. When the lower core rod is installed, the movement of the driven slider, the first movable block and the second movable block can drive the clamping plate to move, so that the distance between the clamping plates changes, thereby adjusting the clamping size, facilitating the butt joint of lower core rods of different sizes. After the lower core rod is clamped by the clamping plate, the driven slider, the first movable block and the second movable block can be moved to adjust the clamping force, so as to obtain different fixing effects and avoid damage to the lower core rod. Moreover, the clamping assembly only needs to move any one of the driven slider, the first movable block and the second movable block to drive the overall structure to change, and compared with the fixed mode of the bolt, the operation difficulty is not increased too much.

[0021] 2、In the present application, the clamping assembly and the control assembly are connected together through a main transmission shaft. When operating, the main transmission shaft can be driven by rotating the turntable, the butt joint gear is driven to rotate by the main transmission shaft, the first transmission rod and the second transmission rod are used at the same time, the positions of the first movable block and the second movable block are changed, the overall adjustment speed is accelerated, and compared with the fixed bolt by the screwdriver, the use of the turntable is more labor-saving and can improve the use experience of the operator.

[0022] 3、In the present application, the limiting assembly limits the movement routes of the driven slider, the first movable block and the second movable block through the four bearing plates, and the limiting plate and the positioning plate at the bottom also assist in determining the movement routes of the components in the clamping assembly, thereby improving the coordination and stability of the overall structure and avoiding the problems of misalignment or inclination during the change of the clamping structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a side view of the installation structure of the lower core rod of the forming press.

[0024] Figure 2 It is a stereoscopic structure schematic view of the installation structure of the core rod of the forming press of the application;

[0025] Figure 3 It is a clamping assembly and control assembly side view of the installation structure of the core rod of the forming press of the application;

[0026] Figure 4 It is a clamping assembly and control assembly connection and structure schematic view of the installation structure of the core rod of the forming press of the application;

[0027] Figure 5 It is a clamping assembly top view of the installation structure of the core rod of the forming press of the application;

[0028] Figure 6 It is a clamping assembly bottom view of the installation structure of the core rod of the forming press of the application;

[0029] Figure 7 It is a driven slider, square connecting plate, first movable block and second movable block connection and position structure schematic view of the installation structure of the core rod of the forming press of the application;

[0030] Figure 8 It is a partial clamping assembly and partial limiting assembly connection structure schematic view of the installation structure of the core rod of the forming press of the application.

[0031] In the figure: 1, limiting assembly; 2, clamping assembly; 3, control assembly; 4, guiding gap; 11, support plate; 12, bearing plate; 13, limiting plate; 14, positioning plate; 21, driven slider; 22, clamping plate; 23, bent connecting rod; 24, first movable block; 25, square connecting plate; 26, second movable block; 27, connecting rod; 28, first transmission rod; 29, second transmission rod; 210, guiding convex strip; 211, toothed plate; 212, positioning round block; 31, protective cover; 32, steering shaft; 33, rotating disc; 34, bearing bottom plate; 35, limiting block; 36, main transmission shaft; 37, hollow support column; 38, driven bevel gear; 39, second bevel gear; 310, hollow cylinder; 311, vertical rotating rod; 312, butt joint gear; 313, first bevel gear. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application. Embodiment One

[0033] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The installation structure of the core rod of the molding press comprises a limiting assembly 1, a clamping assembly 2 and a control assembly 3, the clamping assembly 2 is slidably connected between the limiting assembly 1, and the clamping assembly 2 is meshingly connected between one end of the clamping assembly 2 and one end of the control assembly 3, a guide gap 4 is reserved between the plurality of limiting assemblies 1, the clamping assembly 2 comprises a driven slider 21, a first movable block 24, a square connecting plate 25 and a second movable block 26, the bending connecting rods 23 are rotatably installed on the driven slider 21, the first movable block 24 and the second movable block 26, the clamping plates 22 are fixedly installed on the top of the driven slider 21, the first movable block 24 and the second movable block 26, the other ends of the four bending connecting rods 23 are rotatably connected at the four corners of the square connecting plate 25, the two driven sliders 21 are located at two sides of the square connecting plate 25, the first movable block 24 and the second movable block 26 are located at the other two sides of the square connecting plate 25, the bottom of the first movable block 24 and the bottom of the second movable block 26 are fixedly installed with the connecting rods 27, the first transmission rod 28 is fixedly installed on the connecting rod 27 at the bottom of the first movable block 24, the second transmission rod 29 is fixedly installed on the connecting rod 27 at the bottom of the second movable block 26, the toothed plates 211 are fixedly installed on one side of the first transmission rod 28 and one side of the second transmission rod 29, the control assembly 3 comprises a butt joint gear 312, a vertical rotating rod 311 and a hollow cylinder 310, the vertical rotating rod 311 is rotatably installed in the hollow cylinder 310, the butt joint gear 312 is fixedly installed at the top of the vertical rotating rod 311, the butt joint gear 312 is meshingly connected with the toothed plates 211, the two toothed plates 211 are located at two sides of the butt joint gear 312, and the top of the vertical rotating rod 311 is rotatably connected to the bottom of the square connecting plate 25.

[0034] In this embodiment, the clamping assembly 2 is slidably installed on the limiting assembly 1 and is controlled by the control assembly 3, in the use process, first, the core rod is inserted between the four clamping plates 22, then the vertical rotating rod 311 in the control assembly 3 is rotated, and the two toothed plates 211 are pushed by the butt joint gear 312 on the vertical rotating rod 311;

[0035] Two toothed plates 211 are arranged on both sides of the butt joint gear 312, and in the process of rotation of the butt joint gear 312, the two toothed plates 211 will drive the first transmission rod 28 and the second transmission rod 29 to move in two directions respectively, and the first transmission rod 28 and the second transmission rod 29 simultaneously pull the first movable block 24 and the second movable block 26 to move towards the center of the limiting assembly 1, and the connecting rod 27 connects the first transmission rod 28 and the first movable block 24 and the second transmission rod 29 and the second movable block 26 together;

[0036] Since the bent connecting rods 23 on the first movable block 24 and the second movable block 26 are connected at the corners of the square connecting plate 25 and are also on the diagonal lines of the square connecting plate 25, in the process of movement of the first movable block 24 and the second movable block 26, the square connecting plate 25 is pushed to rotate, and in the process of rotation, the driven sliding block 21 is pulled to move through the other two bent connecting rods 23, so as to achieve the purpose of simultaneously changing the positions of the four clamping plates 22, and the clamping of the lower core rod is completed.

[0037] The vertical rotating rod 311 is installed inside the hollow cylinder 310, which determines the position of the butt joint gear 312, so that in the process of rotation of the butt joint gear 312, the position of the toothed plate 211 will not be changed, and the normal transmission of the structure is ensured.

[0038] If it is necessary to expand the size of the clamping, the vertical rotating rod 311 is reversely rotated, the first movable block 24 and the second movable block 26 are pushed to move towards the corners of the limiting assembly 1 by the butt joint gear 312, the distance between the clamping plates 22 is expanded, and core rods of various sizes can be used. Embodiment two

[0039] According to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the clamping assembly 2 comprises a driven slider 21, a first movable block 24, a square connecting plate 25 and a second movable block 26, the driven slider 21, the first movable block 24 and the second movable block 26 are all rotatably installed with a bent connecting rod 23, the top of the driven slider 21, the first movable block 24 and the second movable block 26 is fixedly installed with a clamping plate 22, the other end of the four bent connecting rods 23 is rotatably connected at the four corners of the square connecting plate 25, the two driven sliders 21 are located at two sides of the square connecting plate 25, the first movable block 24 and the second movable block 26 are located at the other two sides of the square connecting plate 25, the bottom of the first movable block 24 and the second movable block 26 is fixedly installed with a connecting rod 27, the first movable block 24 is fixedly installed with a first transmission rod 28 on the connecting rod 27 at the bottom, the second movable block 26 is fixedly installed with a second transmission rod 29 on the connecting rod 27 at the bottom, the side of the first transmission rod 28 and the second transmission rod 29 is fixedly installed with a tooth plate 211, the upper surface of the square connecting plate 25 is fixedly installed with a positioning round block 212, the driven slider 21, the first movable block 24 and the second movable block 26 are all located inside the guide gap 4.

[0040] In the embodiment, the guide gap 4 can determine the moving route of the driven slider 21, the first movable block 24 and the second movable block 26, and ensure that the clamping plate 22 located above will not be inclined or dislocated, so as to ensure the clamping quality;

[0041] In the process of moving of the first movable block 24 and the second movable block 26 along the guide gap 4, the square connecting plate 25 will be pushed to rotate with the positioning round block 212 as the center, and the rotation of the square connecting plate 25 will transmit the force to each clamping plate 22, so as to promote the displacement of the clamping plate 22, and control the clamping force while adjusting the clamping size in time;

[0042] The driven slider 21 is two, and is located at the four corners of the square connecting plate 25 with the first movable block 24 and the second movable block 26, so that when the first movable block 24 and the second movable block 26 move, the square connecting plate 25 can be pushed to rotate through the bent connecting rod 23. Embodiment three

[0043] According to Figure 2 , Figure 3 and Figure 4As shown, the control assembly 3 comprises a docking gear 312, a vertical rotating rod 311 and a hollow cylinder 310, the vertical rotating rod 311 is rotatably installed inside the hollow cylinder 310, the docking gear 312 is fixedly installed on the top of the vertical rotating rod 311, the docking gear 312 is in meshing connection with the toothed plate 211, two toothed plates 211 are respectively located on the two sides of the docking gear 312, the top of the vertical rotating rod 311 is rotatably connected to the bottom of the square connecting plate 25, the bottom of the hollow cylinder 310 is fixedly connected with a bearing bottom plate 34, the other end of the bearing bottom plate 34 is fixedly installed with a hollow support column 37, the hollow cylinder 310 and the hollow support column 37 are respectively located at the two ends of the bearing bottom plate 34, the upper surface of the bearing bottom plate 34 is fixedly installed with a limiting block 35, the limiting block 35 is rotatably installed with a main transmission shaft 36, the two ends of the main transmission shaft 36 are rotatably connected inside the hollow cylinder 310 and the hollow support column 37, the two ends of the main transmission shaft 36 are fixedly installed with a driven bevel gear 38, the outer wall of the vertical rotating rod 311 is fixedly installed with a first bevel gear 313, the first bevel gear 313 is in meshing connection with one of the driven bevel gears 38, the inside of the hollow support column 37 is rotatably connected with a steering shaft 32, the outer wall of the steering shaft 32 is fixedly installed with a second bevel gear 39, the second bevel gear 39 is in meshing connection with the other driven bevel gear 38, the top of the steering shaft 32 is fixedly installed with a rotating disc 33, the second bevel gear 39, the driven bevel gear 38 and the outside of the hollow support column 37 are provided with a protective cover 31.

[0044] In this embodiment, the control assembly 3 mainly uses the rotating disc 33 to drive the main transmission shaft 36, when operating, the rotating disc 33 is manually rotated to drive the steering shaft 32, and the second bevel gear 39 on the steering shaft 32 is used in cooperation with the driven bevel gear 38 on the main transmission shaft 36 to push the main transmission shaft 36 to rotate;

[0045] The driven bevel gear 38 at the other end of the main transmission shaft 36 will push the first bevel gear 313 on the vertical rotating rod 311, so as to cause the vertical rotating rod 311 to rotate, thereby providing power source for the operation of the clamping assembly 2, and the overall operation mode does not change much compared with using a screwdriver to rotate a bolt, and will not affect the use feeling of the operator;

[0046] The steering shaft 32 is installed in the hollow support column 37, and the vertical rotating rod 311 is installed in the hollow cylinder 310, so as to ensure the stability of the vertical rotating rod 311 and the steering shaft 32, and the main transmission shaft 36 is limited by the limiting block 35, the inside of the limiting block 35 is provided with a bearing to reduce the friction between the limiting block 35 and the main transmission shaft 36, and the bearing bottom plate 34 determines the direction of the entire control assembly 3, so as to avoid affecting the normal operation of the clamping assembly 2. Embodiment four

[0047] According to Figure 1 , Figure 2 andFigure 8 As shown, the limiting assembly 1 comprises a support plate 11, a bearing plate 12, a limiting plate 13 and a positioning plate 14, the bearing plate 12 is fixedly installed on the top of the support plate 11, the limiting plate 13 is fixedly installed on the lower surface of the bearing plate 12, the positioning plate 14 is fixedly installed on one side of the support plate 11, one side of the bent connecting rod 23 on the driven slider 21 is overlapped on one side of the limiting plate 13, the limiting plate 13 is located on one side of the driven slider 21, the positioning round block 212 is rotatably connected between the bearing plate 12, the first transmission rod 28 and the second transmission rod 29 are slidably connected between the positioning plate 14, the outer wall of the first transmission rod 28 and the second transmission rod 29 is fixedly installed with the guide convex strip 210.

[0048] In this embodiment, the support plate 11 determines the position of the four bearing plates 12, thereby synchronously determining the installation center of the core rod, the limiting plate 13 at the bottom of the bearing plate 12 is located on one side of the driven slider 21, which can assist in fixing the driven slider 21 and determine the maximum rotation range of the bent connecting rod 23 to avoid the driven slider 21 from being separated from the bearing plate 12;

[0049] The positioning plate 14 is used to support the position of the first transmission rod 28 and the second transmission rod 29, the guide convex strip 210 is installed on the first transmission rod 28 and the second transmission rod 29, which can determine the moving route of itself, thereby avoiding the problem of deviation and ensuring that the tooth plate 211 can be always meshed and connected with the mating gear 312.

[0050] The working principle and the use method of the device are as follows: when used, first, the initial position of the clamping plate 22 is adjusted by rotating the rotating disc 33, the rotating disc 33 drives the main transmission shaft 36 to rotate through the second bevel gear 39 on the steering shaft 32, the main transmission shaft 36 drives the vertical rotating rod 311 to rotate through the cooperation of the driven bevel gear 38 and the first bevel gear 313;

[0051] When the vertical rotating rod 311 rotates, the mating gear 312 on the top of the vertical rotating rod 311 will simultaneously push the tooth plate 211 to move to both sides, the tooth plate 211 is installed on the first transmission rod 28 and the second transmission rod 29, which will simultaneously push the first movable block 24 and the second movable block 26 to move, and the moving route of the first transmission rod 28 and the second transmission rod 29 will be limited by the guide convex strip 210 and the positioning plate 14;

[0052] In the moving process of the first movable block 24 and the second movable block 26, the square connecting plate 25 is pushed to rotate with the positioning round block 212 as the center by the bent connecting rod 23, the driven slider 21 is pulled to move along the guide gap 4 by the bent connecting rod 23 on the other two corners, thereby achieving the purpose of changing the position of the clamping plate 22;

[0053] After the initial size is adjusted, the mandrel is inserted between the four clamping plates 22, and finally the final clamping size and clamping force are adjusted by rotating the rotating disc 33. If the distance between the clamping plates 22 is too small, the clamping size can be expanded by rotating the rotating disc 33 in the opposite direction.

[0054] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A mounting structure of a core rod of a molding press, characterized by: Including limiting component (1), clamping assembly (2) and control assembly (3), clamping assembly (2) and limiting component (1) between sliding connection, the one end of clamping assembly (2) and the one end of control assembly (3) between engagement connection, multiple limiting component (1) between the reserved guide gap (4); The clamping assembly (2) includes driven slider (21), first movable block (24), square connecting plate (25) and second movable block (26), the driven slider (21), first movable block (24) and second movable block (26) are all rotatably installed with bending connecting rod (23), the top of driven slider (21), first movable block (24) and second movable block (26) is all fixedly installed with clamping plate (22), the other end of four bending connecting rods (23) is rotatably connected at the four corners of square connecting plate (25), two driven sliders (21) are located at the two sides of square connecting plate (25), and the first movable block (24) and the second movable block (26) are located at the other two sides of square connecting plate (25); The bottom of the first movable block (24) and the second movable block (26) is all fixedly installed with the adapter rod (27), the first transmission rod (28) is fixedly installed on the adapter rod (27) of the bottom of the first movable block (24), the second transmission rod (29) is fixedly installed on the adapter rod (27) of the bottom of the second movable block (26), and the side of the first transmission rod (28) and the second transmission rod (29) is all fixedly installed with the toothed plate (211); The control assembly (3) includes butt gear (312), vertical rotating rod (311) and hollow cylinder (310), the vertical rotating rod (311) is rotatably installed in the hollow cylinder (310), the butt gear (312) is fixedly installed at the top of the vertical rotating rod (311), the butt gear (312) is rotatably connected with the toothed plate (211), two toothed plates (211) are located at the two sides of the butt gear (312), and the top of the vertical rotating rod (311) is rotatably connected to the bottom of the square connecting plate (25). The bottom of the hollow cylinder (310) is fixedly connected with a bearing bottom plate (34), one end of the bearing bottom plate (34) is fixedly installed with a hollow support column (37), the hollow cylinder (310) and the hollow support column (37) are located at two ends of the bearing bottom plate (34) respectively, the upper surface of the bearing bottom plate (34) is fixedly installed with a limiting block (35), the inside of the limiting block (35) is rotatably installed with a main transmission shaft (36), both ends of the main transmission shaft (36) are rotatably connected in the hollow cylinder (310) and the hollow support column (37) respectively, both ends of the main transmission shaft (36) are fixedly installed with a driven bevel gear (38), the outer wall of the vertical rotating rod (311) is fixedly installed with a first bevel gear (313), the first bevel gear (313) is meshedly connected with one driven bevel gear (38), the inside of the hollow support column (37) is rotatably connected with a steering shaft (32), the outer wall of the steering shaft (32) is fixedly installed with a second bevel gear (39), the second bevel gear (39) is meshedly connected with another driven bevel gear (38), the top of the steering shaft (32) is fixedly installed with a rotating disc (33), the second bevel gear (39), the driven bevel gear (38) and the outside of the hollow support column (37) are provided with a protective cover (31), the upper surface of the square connecting plate (25) is fixedly installed with a positioning circular block (212), the driven sliding block (21), the first movable block (24) and the second movable block (26) are located in the inside of the guide gap (4), the limiting assembly (1) comprises a supporting plate (11), a bearing plate (12), a limiting plate (13) and a positioning plate (14), the bearing plate (12) is fixedly installed on the top of the supporting plate (11), the limiting plate (13) is fixedly installed on the lower surface of the bearing plate (12), the positioning plate (14) is fixedly installed on one side of the supporting plate (11), one side of the bending connecting rod (23) of the driven sliding block (21) is lapped on one side of the limiting plate (13), the limiting plate (13) is located on one side of the driven sliding block (21), the positioning circular block (212) is rotatably connected between the bearing plate (12), the first transmission rod (28) and the second transmission rod (29) are slidably connected with the positioning plate (14), the outer wall of the first transmission rod (28) and the second transmission rod (29) is fixedly installed with a guide convex strip (210).

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