A bending device for steel structure processing

Abstract

The utility model provides a kind of bending device for steel structure processing, it is related to bending device technical field, including workbench, bending drive mechanism, detachable bending mould, first rotary stop roll, front and rear telescopic mounting platform, second rotary stop roll, detachable bending mould base;When carrying out overall bending to steel pipe, steel bar, shaped steel and other strip steel structures, detachable bending mould base is disassembled, steel structure both sides are limited in first rotary stop roll front end, hydraulic rear shift detachable bending mould extrusion steel structure is bent, second rotary stop roll is shielded in the front of steel structure both ends after bending, when bending to predetermined angle, play limiting shielding effect;When carrying out bending to form groove to the surface of this kind of steel structure of strip steel plate, install detachable bending mould base, with detachable bending mould rear shift cooperation corresponding detachable bending mould base carries out bending to form groove to the surface of strip steel plate, realize the effect of one machine multi-use, significantly improve equipment utilization.

Description

Technical Field

[0001] This utility model relates to the field of bending device technology, and in particular to a bending device for steel structure processing. Background Technology

[0002] The descriptions in this section provide background information relevant to this disclosure only and do not constitute prior art.

[0003] Steel structures are structures made of steel materials and are one of the main types of building structures. The processing of steel structures involves processes such as stamping and bending. The bending process is mainly used to fold steel raw materials such as steel plates, steel pipes, steel bars, and shaped steel into the curved shapes required for use.

[0004] Existing steel structure bending equipment often requires the replacement of specialized equipment or molds when processing different types of steel structures, resulting in cumbersome operation and low equipment utilization. Furthermore, traditional bending equipment lacks workpiece limiting during the bending process, easily leading to excessive bending angles, which affects processing quality and efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a bending device for steel structure processing, which can perform overall bending of strip steel structures such as steel pipes, steel bars, and shaped steel, and limit the maximum bending angle; it can also bend the surface of steel structures such as strip steel plates to form grooves, achieving the effect of one machine for multiple uses; it solves the technical problems of existing steel structure bending devices, which often require changing special equipment or molds when processing different types of steel structures, resulting in cumbersome operation and low equipment utilization; and the lack of workpiece limiting during the bending process, which easily leads to excessive bending angles, affecting processing quality and efficiency.

[0006] This utility model provides a bending device for steel structure processing, comprising:

[0007] The workbench has a bending drive mechanism fixedly mounted longitudinally on the front side of the center of its top surface.

[0008] The rear end of the bending drive mechanism is equipped with a detachable bending die.

[0009] The workbench is equipped with first rotating stop rollers at the left and right edges of the rear end of the top surface of the workbench.

[0010] The workbench is symmetrically equipped with front and rear telescopic mounting platforms at its left and right ends, and a second rotating stop roller is installed at the upper end of its movable part.

[0011] The open ends of the first and second rotating guide rollers face inward;

[0012] A detachable bending die holder is assembled at the middle of the rear end of the top surface of the workbench.

[0013] As a further optimization, in order to facilitate the installation and disassembly of the detachable bending die holder, positioning holes are evenly provided along the length direction at the rear end edge of the top surface of the workbench;

[0014] The lower end of the detachable bending die base is provided with a positioning rod corresponding to the positioning hole, and the lower end of the positioning rod is inserted into the corresponding positioning hole.

[0015] As a further optimization, in order to serve as a bending die holder for steel structure plates, and to cooperate with the replacement of corresponding detachable bending dies for bending strip steel plates of corresponding sizes, the detachable bending die holder includes:

[0016] The back panel has a V-shaped groove fixedly fitted to the middle of its front wall.

[0017] The upper end of the positioning rod is fixedly connected to the lower end of the back plate.

[0018] As a further optimization, the wedge-shaped slider is slidably engaged within the wedge-shaped groove, and the rear end of the wedge-shaped slider is integrally formed into a bending module, facilitating the disassembly and installation of the bending module. The detachable bending die includes:

[0019] A wedge-shaped groove is longitudinally formed at the rear end of the bending drive mechanism;

[0020] A wedge-shaped slider is slidably inserted into the wedge-shaped groove;

[0021] The bending module has its front end integrally formed with the rear end of the wedge-shaped slider.

[0022] As a further optimization, in order to improve the strength of the bending module installation, the left and right side walls of the rear end of the bending drive mechanism are provided with connecting bolts that pass through the reserved through holes on the left and right side walls of the wedge-shaped slider.

[0023] A fixing nut is screwed to the end of the connecting bolt.

[0024] As a further optimization, in order to fill the gap between the rear end of the bending drive mechanism and the bending module by using a pad to ensure the strength of the bending module connection, a gap is left between the front end of the bending module and the rear end of the bending drive mechanism.

[0025] Pad blocks are welded to both the left and right sides of the rear end of the bending drive mechanism.

[0026] The front end of the bending module is attached to the rear end of the left and right side pads.

[0027] As a further optimization, to facilitate the movement of the second rotating stop roller on the front and rear drive plates, the second rotating stop roller is moved to the angle at which the steel structure is expected to bend. When the steel structure bends to this angle, a blocking and limiting mechanism is implemented to prevent excessive bending. The front and rear telescopic installation platform includes:

[0028] The mounting slot is located at the left or right end of the workbench;

[0029] The front end of the workbench is embedded and fixed with a first hydraulic cylinder in the mounting groove, and its telescopic rear end extends into the corresponding mounting groove.

[0030] The first hydraulic cylinder has a support plate fixedly mounted on its telescopic end, and the second rotating stop roller is mounted on the upper end of the corresponding support plate.

[0031] As a further optimization, in order to stably guide the back-and-forth sliding of the pallet, a strip-shaped groove is provided on the inner side of the inner wall of the mounting groove along the length direction.

[0032] The outer wall of the pallet is fixedly fitted with a guide block corresponding to the strip groove, and the guide block is slidably fitted into the corresponding strip groove.

[0033] As a further optimization, in order to utilize the left and right first rotating stop rollers to block and limit the left and right ends of the steel structure, the rollers rotate along with the bending process of the steel structure. The first and second rotating stop rollers have the same structure, and the second rotating stop roller includes:

[0034] The longitudinal portion of the L-shaped plate is fixed perpendicularly to the upper end of the movable portion of the front and rear telescopic mounting platform.

[0035] The top surface of the transverse portion of the L-shaped plate is perforated by mounting bolts;

[0036] The lower end of the mounting bolt is screwed to the upper end of the corresponding movable part of the front and rear telescopic mounting platform;

[0037] The mounting bolt has no external thread in the middle of its outer wall, and a round roller is fixedly sleeved in the middle of its outer wall.

[0038] As a further optimization, in order to drive the detachable bending die to move back and forth, the bending module that moves backward is used to bend and compress the steel structure. The bending drive mechanism includes:

[0039] A vertical plate is fixedly mounted on the front side of the middle part of the top surface of the workbench;

[0040] The front wall of the upright plate is vertically fixedly equipped with a second hydraulic cylinder, and its telescopic rear end is fixedly equipped with a rectangular block through the upright plate.

[0041] Guide rods are vertically fixed to both the left and right sides of the front wall of the rectangular block.

[0042] Both ends of the upright plate are fixedly fitted with ear plates, and the front end of the guide rod passes through the ear plates on the same side.

[0043] This utility model provides an improved bending device for steel structure processing, which has the following improvements and advantages compared with the prior art:

[0044] 1. A bending drive mechanism is used to drive the detachable bending die to move backward and provide bending pressure. The detachable bending die can be disassembled and replaced with bending modules of different shapes to match different bending requirements. When bending strip steel structures such as steel pipes, steel bars, and shaped steel as a whole, the detachable bending die base is disassembled. The bending position of the steel structure corresponds to the detachable bending die. The two sides of the steel structure are abutted against the front end of the first rotating stop roller for limitation. The hydraulically moved detachable bending die squeezes the steel structure to bend. The second rotating stop roller blocks the front of the two ends of the steel structure after bending. When the bending reaches the predetermined angle, it plays a limiting and blocking role.

[0045] 2. When bending the surface of steel structures such as strip steel plates to form grooves, install a detachable bending die holder and replace the corresponding detachable bending die. As the detachable bending die moves backward, it works in conjunction with the detachable bending die holder to bend the surface of the strip steel plate to form grooves, achieving the effect of one machine serving multiple purposes and significantly improving equipment utilization. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of this utility model;

[0048] Figure 2 This is a schematic diagram of the disassembled bending die holder of this utility model after disassembly.

[0049] Figure 3 This is a schematic diagram of the detachable bending die holder structure of this utility model;

[0050] Figure 4 This is a schematic diagram of the detachable bending die structure of this utility model;

[0051] Figure 5 This is a schematic diagram of the front and rear telescopic mounting platform and the second rotating stop roller structure of this utility model.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1-Workbench, 11-Positioning hole, 2-Bending drive mechanism, 21-Upright plate, 22-Second hydraulic cylinder, 23-Rectangular block, 24-Ear plate, 25-Guide rod, 3-Front and rear telescopic mounting platform, 31-Mounting groove, 32-First hydraulic cylinder, 33-Support plate, 34-Strip groove, 35-Guide block, 4-Second rotating stop roller, 41-L-shaped plate, 42-Mounting bolt, 43-Round roller, 5-First rotating stop roller, 6-Disassembled bending die, 61-Wedge groove, 62-Wedge slider, 63-Bending module, 64-Padded block, 65-Connecting bolt, 7-Disassembled bending die base, 71-Back plate, 72-Positioning rod, 73-V-shaped groove. Detailed Implementation

[0054] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0055] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0056] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] Please see Figure 1-5This utility model provides a technical solution: a bending device for steel structure processing, comprising:

[0058] The workbench 1 has a bending drive mechanism 2 fixedly mounted longitudinally on the front side of the middle of its top surface;

[0059] The rear end of the bending drive mechanism 2 is equipped with a detachable bending die 6;

[0060] The top surface of the workbench 1 is equipped with first rotating guide rollers 5 at the left and right edges of the rear end;

[0061] The workbench 1 is symmetrically equipped with front and rear telescopic mounting platforms 3 at both ends, and the upper end of its movable part is equipped with a second rotating stop roller 4.

[0062] The open ends of the first rotating stop roller 5 and the second rotating stop roller 4 face inward;

[0063] A detachable bending die holder 7 is installed at the middle of the rear end of the top surface of the workbench 1.

[0064] Specifically in this embodiment, the workbench 1 is made of stainless steel as a device mounting platform. The positioning rod 72 is inserted into the corresponding positioning hole 11 to realize the installation of the detachable bending die 7. When disassembling, the detachable bending die 7 is lifted up and the positioning rod 72 is pulled out from the corresponding positioning hole 11.

[0065] Furthermore, a bending drive mechanism 2 is used to drive the detachable bending die 6 to move backward to provide bending pressure. The detachable bending die 6 can be disassembled and replaced with bending modules 63 of different shapes to match different bending requirements. When bending steel pipes, steel bars, and structural steel, the detachable bending die base 7 is disassembled. The bending position of the steel structure corresponds to the detachable bending die 6. The two sides of the steel structure are abutted against the front end of the first rotating stop roller 5 for limiting. The hydraulically moved detachable bending die 6 squeezes the steel structure to bend. The second rotating stop roller 4 blocks the front of the two ends of the steel structure after bending. When the bending reaches the predetermined angle, it plays a limiting and blocking role.

[0066] More specifically, when bending the surface of steel structures such as strip steel plates to form grooves, a detachable bending die holder 7 is installed, and the corresponding detachable bending die 6 is replaced. As the detachable bending die 6 moves backward to cooperate with the detachable bending die holder 7, the surface of the strip steel plate is bent to form grooves, achieving the effect of one machine serving multiple purposes and significantly improving equipment utilization.

[0067] It is understood that in this embodiment, the length of the applicable strip steel plate is less than the distance between the two first rotating stop rollers.

[0068] In some embodiments, positioning holes 11 are uniformly provided along the length direction at the rear end edge of the top surface of the workbench 1;

[0069] The lower end of the detachable bending die base 7 is provided with a positioning rod 72 corresponding to the positioning hole 11, and the lower end of the positioning rod 72 is inserted into the corresponding positioning hole 11.

[0070] The detachable bending die holder 7 includes:

[0071] The back plate 71 has a V-shaped groove 73 fixedly fitted in the middle of its front wall;

[0072] The upper end of the positioning rod 72 is fixedly connected to the lower end of the back plate 71.

[0073] Specifically in this embodiment, the back plate 71 is connected and fixed by inserting the positioning rod 72 into the corresponding positioning hole 11, and the positioning rod 72 is pulled out from the corresponding positioning hole 11 when the back plate 71 is lifted.

[0074] Furthermore, the V-shaped groove 73, in conjunction with the bending module 63 with a V-shaped protrusion at the front end, is used to bend the surface of steel structures such as strip steel plates to form grooves.

[0075] More specifically, in order to form grooves of different shapes, a detachable bending die base 7 is equipped with V-shaped grooves 73 of different shapes and depths, and various bending modules 63 and wedge sliders 62 are also provided for easy replacement.

[0076] In some embodiments, the detachable bending die 6 includes:

[0077] A wedge-shaped groove 61 is longitudinally formed at the rear end of the bending drive mechanism 2;

[0078] The wedge-shaped slider 62 is slidably inserted into the wedge-shaped groove 61;

[0079] The bending module 63 is integrally formed with the rear end of the wedge-shaped slider 62 at its front end;

[0080] The bending drive mechanism 2 has connecting bolts 65 penetrating the left and right side walls of the rear end, which penetrate the reserved through holes on the left and right side walls of the wedge-shaped slider 62;

[0081] A fixing nut is screwed to the end of the connecting bolt 65.

[0082] Specifically in this embodiment, the wedge-shaped slider 62 and the inner wall of the wedge-shaped groove 61 are fitted together, and the wedge-shaped slider 62 is positioned by friction after being inserted into the wedge-shaped groove 61;

[0083] Furthermore, the connecting bolt 65 passes through the reserved through holes on the left and right side walls of the rear end of the bending drive mechanism 2 and the reserved through holes on the left and right side walls of the wedge slider 62. Then, a fixing nut is screwed into the end of the connecting bolt 65 to stably fix the wedge slider 62 in the wedge groove 61.

[0084] In some embodiments, a gap is left between the front end of the bending module 63 and the rear end of the bending drive mechanism 2;

[0085] The bending drive mechanism 2 has pads 64 welded to both the left and right sides of its rear end;

[0086] The front end of the bending module 63 is attached to the rear end of the left and right side pads 64. The pads 64 fill the gap between the rear end of the bending drive mechanism 2 and the bending module 63 to ensure the strength of the connection between the bending module 63.

[0087] In some embodiments, the telescopic mounting platform 3 includes:

[0088] The mounting slot 31 is located at the left or right end of the workbench 1.

[0089] The first hydraulic cylinder 32 is embedded and fixed in the mounting groove 31 at the front end of the workbench 1, and its telescopic rear end extends into the corresponding mounting groove 31.

[0090] The telescopic end of the first hydraulic cylinder 32 is fixedly equipped with a support plate 33, and the second rotating stop roller 4 is assembled on the upper end of the corresponding support plate 33.

[0091] A strip groove 34 is provided on the inner side of the inner wall of the mounting groove 31 along the length direction;

[0092] A guide block 35 is fixedly mounted on the outer wall of the pallet 33 corresponding to the strip groove 34, and the guide block 35 is slidably mounted in the corresponding strip groove 34.

[0093] Specifically in this embodiment, the first hydraulic cylinder 32 is connected to an external hydraulic system, and the first hydraulic cylinder 32 drives the pallet 33 to move the second rotating roller 4 back and forth.

[0094] Furthermore, a scale groove can be provided along the length of the edge of the mounting groove 31 to facilitate control of the forward and backward movement of the second rotating guide roller 4;

[0095] More specifically, the guide block 35 on the outer wall of the pallet 33 slides within the strip groove 34 on the inner wall of the mounting groove 31, providing stable guidance for the back-and-forth sliding of the pallet 33.

[0096] In some embodiments, the first rotating guide roller 5 and the second rotating guide roller 4 have the same structure, and the second rotating guide roller 4 includes:

[0097] L-shaped plate 41, the longitudinal part of which is fixed perpendicularly to the upper end of the movable part of the front and rear telescopic mounting platform 3;

[0098] A mounting bolt 42 passes through the top surface of the transverse portion of the L-shaped plate 41;

[0099] The lower end of mounting bolt 42 is screwed to the upper end of the movable part of the corresponding front and rear telescopic mounting platform 3;

[0100] The mounting bolt 42 has no external thread in the middle of its outer wall, and a round roller 43 is fixedly sleeved in the middle of the outer wall of the mounting bolt 42.

[0101] Specifically in this embodiment, the L-shaped plate 41 serves as a mounting bracket, and the mounting bolt 42 passes through the top surface of the L-shaped plate 41 and is screwed to the fixed platform at its lower end.

[0102] Furthermore, the mounting bolt 42 has a special shape design, with the central thread eliminated, for rotating the mounting roller 43. Rotation is achieved through a bearing.

[0103] It is understandable that the roller 43 rotates due to friction from the steel structure as the steel structure bends.

[0104] In some embodiments, the bending drive mechanism 2 includes:

[0105] The upright plate 21 is vertically fixedly assembled to the front side of the middle part of the top surface of the workbench 1;

[0106] A second hydraulic cylinder 22 is vertically fixedly mounted on the front wall of the upright plate 21, and a rectangular block 23 is fixedly mounted through the rear end of the cylinder 21.

[0107] Guide rods 25 are vertically fixed to both the left and right sides of the front wall of rectangular block 23;

[0108] Both ends of the upright plate 21 are fixedly fitted with ear plates 24, and the front end of the guide rod 25 passes through the ear plate 24 on the same side.

[0109] Specifically in this embodiment, the second hydraulic cylinder 22 is connected to an external hydraulic system to drive the rectangular block 23 to move back and forth. The rectangular block 23 serves as the rear end of the bending drive mechanism 2 for the installation of the detachable bending die 6.

[0110] Furthermore, the guide rod 25 slides along the reserved through holes on the front and rear side walls of the ear plate 24 to guide the forward and backward movement of the rectangular block 23 and the detachable bending die 6.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bending device for steel structure processing, characterized in that, include: The workbench (1) has a bending drive mechanism (2) fixedly mounted longitudinally on the front side of the middle of its top surface; The rear end of the bending drive mechanism (2) is equipped with a detachable bending die (6); The workbench (1) is equipped with first rotating stop rollers (5) at the left and right edges of the rear end of the top surface; The workbench (1) is symmetrically equipped with front and rear telescopic mounting platforms (3) at its left and right ends, and a second rotating stop roller (4) is installed at the upper end of its movable part. The opening ends of the first rotating stop roller (5) and the second rotating stop roller (4) face inward; The workbench (1) is equipped with a detachable bending die base (7) at the middle of the rear end of its top surface.

2. The bending device for steel structure processing according to claim 1, characterized in that, The workbench (1) has positioning holes (11) evenly distributed along its length at the rear edge of its top surface; The lower end of the detachable bending die base (7) is provided with a positioning rod (72) corresponding to the positioning hole (11), and the lower end of the positioning rod (72) is inserted into the corresponding positioning hole (11).

3. A bending device for steel structure processing according to claim 2, characterized in that, The detachable bending die (7) includes: The back plate (71) has a V-shaped groove (73) fixedly fitted in the middle of its front wall; The upper end of the positioning rod (72) is fixedly connected to the lower end of the back plate (71).

4. The bending device for steel structure processing according to claim 1, characterized in that, The detachable bending die (6) includes: A wedge-shaped groove (61) is longitudinally opened at the rear end of the bending drive mechanism (2); A wedge-shaped slider (62) is slidably inserted into the wedge-shaped groove (61); The bending module (63) is integrally formed with the rear end of the wedge-shaped slider (62) at its front end.

5. A bending device for steel structure processing according to claim 4, characterized in that, The bending drive mechanism (2) has connecting bolts (65) penetrating the left and right side walls of the rear end, which penetrate the reserved through holes on the left and right side walls of the wedge-shaped slider (62); A fixing nut is screwed to the end of the connecting bolt (65).

6. A bending device for steel structure processing according to claim 4, characterized in that, A gap is left between the front end of the bending module (63) and the rear end of the bending drive mechanism (2); The bending drive mechanism (2) has pads (64) welded to both the left and right sides of its rear end; The front end of the bending module (63) is attached to the rear end of the left and right side pads (64).

7. A bending device for steel structure processing according to claim 1, characterized in that, The telescopic installation platform (3) includes: The mounting slot (31) is located at the left or right end of the workbench (1); The front end of the workbench (1) is embedded and fixed with a first hydraulic cylinder (32) in the mounting groove (31), and its telescopic rear end extends into the corresponding mounting groove (31); The first hydraulic cylinder (32) has a support plate (33) fixedly mounted on its telescopic end, and the second rotating stop roller (4) is mounted on the upper end of the corresponding support plate (33).

8. A bending device for steel structure processing according to claim 7, characterized in that, The inner wall of the mounting groove (31) is provided with a strip groove (34) along the length direction; The outer wall of the tray (33) is fixedly fitted with a guide block (35) corresponding to the strip groove (34), and the guide block (35) is slidably fitted in the corresponding strip groove (34).

9. A bending device for steel structure processing according to claim 1, characterized in that, The first rotating guide roller (5) and the second rotating guide roller (4) have the same structure, and the second rotating guide roller (4) includes: The longitudinal part of the L-shaped plate (41) is vertically fixed to the upper end of the movable part of the front and rear telescopic mounting platform (3); The top surface of the transverse portion of the L-shaped plate (41) is provided with mounting bolts (42); The lower end of the mounting bolt (42) is screwed to the upper end of the movable part corresponding to the front and rear telescopic mounting platform (3); The mounting bolt (42) has no external thread in the middle of its outer wall, and a round roller (43) is fixedly sleeved in the middle of its outer wall.

10. A bending device for steel structure processing according to claim 1, characterized in that, The bending drive mechanism (2) includes: The upright plate (21) is vertically fixedly assembled to the front side of the middle of the top surface of the workbench (1); The front wall of the upright plate (21) is vertically fixedly equipped with a second hydraulic cylinder (22), and its telescopic rear end is fixedly equipped with a rectangular block (23) through the upright plate (21); The rectangular block (23) has guide rods (25) vertically fixedly connected to both the left and right sides of its front wall; The left and right ends of the upright plate (21) are fixedly fitted with ear plates (24), and the front end of the guide rod (25) passes through the ear plate (24) on the same side.

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