Construction steel bar machining equipment

Abstract

The invention belongs to the technical field of reinforcing steel bar machining equipment, and discloses construction reinforcing steel bar machining equipment which comprises a base, a mounting frame is arranged on the base, a rotatable rotating base is arranged on the base, a square frame is fixed to the rotating base, and first adjusting assemblies are arranged on the mounting frame and the square frame correspondingly. The mounting frame is further provided with a second adjusting assembly, the second adjusting assembly is located between the two first adjusting assemblies, each of the first adjusting assemblies and the second adjusting assembly comprises two rotating seats and adjusting wheels rotationally connected into the rotating seats, and the two adjusting wheels of the first adjusting assemblies are oppositely arranged; the two adjusting wheels of the second adjusting assembly are arranged in a staggered mode, and a second hydraulic push rod is connected between one rotating base of the second adjusting assembly and the mounting frame. One device can be used as a straightening machine and can also be used as a bending machine, and the practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of steel bar processing equipment, and in particular relates to construction steel bar processing equipment. Background Art

[0002] Construction steel bars often need to be straightened or bent before use. Straightening requires the use of a straightening machine, and bending requires the use of a bending machine. Both straightening and bending machines are special tools. Currently, construction steel bar processing equipment can only achieve one processing method. A steel bar processing equipment cannot be used as both a straightening machine and a bending machine, and its practicality is low. Construction sites need to purchase two types of equipment at the same time when straightening and bending construction steel bars, which makes the processing cost of construction steel bars higher. Summary of the invention

[0003] The purpose of the present invention is to provide a construction steel bar processing device to solve the problem that the existing steel bar processing device can only realize one processing mode.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A construction steel bar processing equipment includes a base, a mounting frame is provided on the base, a rotatable rotating base is provided on the base, a square frame is fixed on the rotating base, a first adjustment component is provided on the mounting frame and the square frame, a second adjustment component is also provided on the mounting frame, and the second adjustment component is located between the two first adjustment components, the first adjustment component and the second adjustment component each include two rotating seats and adjusting wheels rotatably connected to the rotating seats, the two adjusting wheels of the first adjusting component are arranged opposite to each other, the two adjusting wheels of the second adjusting component are staggered, and a second hydraulic push rod is connected between one of the rotating seats of the second adjusting component and the mounting frame.

[0006] Preferably, threaded barrels and limit rods are fixedly mounted on the remaining rotating seats, and the threaded barrels and limit rods slide through the corresponding mounting frames and square frames. Multiple fixed seats are fixedly mounted on the mounting frames and square frames, and multiple fixed seats are rotatably connected to screw rods, and the multiple screw rods are screwed together one by one and extend into multiple threaded barrels.

[0007] Preferably, a fixed frame is fixedly installed on the base at one side of the mounting frame, a rotatable driving wheel is provided in the fixed frame, a first hydraulic push rod is fixedly installed in the fixed frame, a telescopic end of the first hydraulic push rod is fixedly connected to a moving frame, and a clamping wheel is rotatably connected in the moving frame.

[0008] Preferably, an annular bracket is fixedly mounted on the base, a sliding seat is slidably connected inside the annular bracket, and the mounting frame is fixedly mounted on the sliding seat.

[0009] Preferably, a gear ring is fixedly installed in the annular bracket, a rotatable gear is provided in the sliding seat, and the gear is meshed with the gear ring.

[0010] Preferably, a cutting assembly is provided on the rotating base, and the cutting assembly and the square frame are located on the same diameter of the rotating base. The cutting assembly is a one-side open structure, and the cutting assembly can be moved from the side to the upper and lower sides of the steel bar through the rotation of the rotating base.

[0011] Preferably, the cutting assembly comprises a cutting bracket and two cutter seats symmetrically and slidably connected in the cutting bracket, and cutters are fixedly mounted on the two cutter seats, and the two cutters are arranged opposite to each other.

[0012] Preferably, a slide groove is provided on one side of the two cutter seats, a rotatable turntable is provided in the cutting bracket, and two fixing rods which are symmetrically fixedly mounted on the turntable and respectively slidably cooperate with the two slide grooves.

[0013] Preferably, a movable seat is slidably connected on the rotating base between the cutting assembly and the square frame, a rotatable eccentric wheel is provided on the rotating base, a slide is rotatably connected to one side of the eccentric wheel, a guide rod is fixedly installed in the movable seat, and the slide is slidably sleeved on the outside of the guide rod, and a clamping assembly is provided on the top of the movable seat.

[0014] Preferably, the clamping assembly includes two clamping plates symmetrically and slidably connected to the top of the movable seat, the bottom of the two clamping plates are rotatably connected to the first connecting rod, a slide plate is slidably sleeved on the guide rod, a second connecting rod is fixedly installed on the slide plate, and the end of the second connecting rod is rotatably connected to the two first connecting rods, the bottom of the slide plate is fixedly connected to a spring sleeved on the outside of the guide rod, and the slide is located below the spring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention is provided with a rotating base and a second hydraulic push rod. When the device is used as a straightening machine, the rotating base moves the square frame close to the mounting frame so that the two first adjustment components are in the same straight line, and the straightening force is changed by the adjustment wheel of the second adjustment component, so that the device can achieve steel bar straightening; when the device is used as a bending machine, the rotating base moves the square frame to one side to prevent the first adjustment component on the square frame from blocking the steel bar from bending to the side, and then the second hydraulic push rod is used to push the corresponding adjustment wheel in the second adjustment component, and the steel bar is bent with the other adjustment wheel as the axis. In summary, the present invention can be used as both a straightening machine and a bending machine, and has high practicality.

[0017] (2) The present invention is provided with an annular bracket and a slide. When used as a bending machine, the steel bars are transported based on the driving wheel and the clamping wheel so that the steel bars cannot rotate. When performing automatic bending processing, the mounting frame is driven by the slide to move in the annular bracket, so that the pushing direction of the second hydraulic push rod is changed, so that the steel bars can be bent in various directions, thereby realizing the spatial bending processing of the steel bars, so that the processing cost is not limited to the plane structure, thereby increasing the practicality of the equipment.

[0018] (3) The present invention is provided with a turntable. When the cutting assembly is cutting the steel bar, the turntable is rotated so that the two fixed rods on the turntable drive the two cutter seats and the cutter to approach each other, thereby realizing the centering shearing of the cutter and preventing the center line of the steel bar from deviating when the steel bar is cut, causing the steel bar to bend again.

[0019] (4) The present invention is provided with a moving seat and a clamping assembly. When used as a straightening machine, in order to prevent the steel bars from bending due to the weight of the steel bars during the process of moving from the square frame to the cutting assembly, the clamping assembly can be used to clamp the steel bars and the movement of the moving seat can be used to pull the steel bars to the cutting assembly.

[0020] (5) The clamping assembly clamps the steel bar by driving the slide to slide with the eccentric wheel. When moving toward the cutting assembly, the eccentric wheel drives the slide to move along an upward convex semicircular trajectory. When the slide moves upward, it pushes and compresses the spring to move the slide plate upward. The second connecting rod and the first connecting rod make the two clamping plates close to the clamping steel bar, so that the steel bar is always clamped when moving toward the cutting assembly; when moving away from the cutting assembly, the eccentric wheel drives the slide to move along a downward concave semicircular trajectory. When the slide moves downward, it disengages from the spring. The slide plate and the spring drop due to their own gravity, causing the two clamping plates to separate and release the clamping, thereby achieving the clamping of the clamping assembly on the way forward and the release of the clamping assembly on the way back. The clamping assembly does not need to be equipped with additional driving equipment, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Figure 3 It is a cross-sectional view of the adjustment wheel assembly of the present invention;

[0024] Figure 4 It is a cross-sectional view of the assembly of the mobile seat of the present invention;

[0025] Figure 5 A stereogram of the clamping assembly of the present invention;

[0026] Figure 6 It is a cross-sectional view of the assembly of the cutting assembly of the present invention;

[0027] In the figure: 1, base; 2, fixed frame; 3, first hydraulic push rod; 4, mobile frame; 5, annular bracket; 6, gear ring; 7, screw; 8, fixed seat; 9, clamping plate; 10, eccentric wheel; 11, cutting bracket; 12, cutter seat; 13, cutter; 14, rotating base; 15, moving seat; 16, slide; 17, guide rod; 18, spring; 19, square frame; 20, adjusting wheel; 21, rotating seat; 22, mounting frame; 23, second hydraulic push rod; 24, gear; 25, driving wheel; 26, clamping wheel; 27, limit rod; 28, threaded cylinder; 29, slide plate; 30, first connecting rod; 31, second connecting rod; 32, turntable; 33, slide seat. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 6 As shown, the present invention provides the following technical solutions:

[0030] A construction steel bar processing equipment includes a base 1, a mounting frame 22 is provided on the base 1, a rotatable rotating base 14 is provided on the base 1, a square frame 19 is fixed on the rotating base 14, a first adjustment component is provided on the mounting frame 22 and the square frame 19, a second adjustment component is also provided on the mounting frame 22, and the second adjustment component is located between the two first adjustment components, the first adjustment component and the second adjustment component each include two rotating seats 21 and an adjustment wheel 20 rotatably connected to the rotating seat 21, the two adjustment wheels 20 of the first adjustment component are arranged opposite to each other, and the two adjustment wheels 20 of the second adjustment component are staggered, and a second hydraulic push rod 23 is connected between one of the rotating seats 21 of the second adjustment component and the mounting frame 22.

[0031] Based on the above disclosed structure, when performing the straightening and bending operations of building steel bars:

[0032] First, the rotating base 14 is driven to rotate according to the processing operation required for the steel bar, so that the present invention can realize different processing functions. Specifically, when the steel bar needs to be straightened, the rotating base 14 is driven by the motor to rotate so that the square frame 19 moves to the side close to the mounting frame 22, and the center position between the two adjusting wheels 20 of the two first adjusting components on the square frame 19 and the mounting frame 22 is located on the same straight line, so that the center line position of the steel bar is consistent when the steel bar passes through the two adjusting wheels 20 of the two first adjusting components respectively. In addition, since the steel bar has a certain toughness, the steel bar needs to have a slight curvature in the second adjusting component during the steel bar straightening process. The two adjusting wheels 20 set in the second adjusting component are adjusted to push the steel bar to bend, so as to balance the toughness rebound of the steel bar, so that the steel bar is straight when it is output, so as to achieve the purpose of steel bar straightening;

[0033] When the steel bar needs to be bent, the motor drives the rotating base 14 to rotate so that the square frame 19 moves to one side of the base 1, so that the steel bar has enough space to be bent after it extends from the second adjustment component. The two adjustment wheels 20 of the first adjustment component in the mounting frame 22 play a guiding role. When the steel bar passes through the second adjustment component, the second hydraulic push rod 23 is started to push out the rotating base 21 and the adjustment wheel 20 at the telescopic end to push the steel bar, so that the steel bar is bent with the axis of the other adjustment wheel of the second adjustment component as the axis. The bending of different angles can be achieved by the telescopic length of the second hydraulic push rod 23, thereby achieving the purpose of bending the steel bar;

[0034] In summary, the rotation of the rotating base 14 drives the first adjusting component in the square frame 19 to move, so that the present invention can be used as both a straightening machine and a bending machine, so that different steel bar processing methods can be realized, and the practicality is high.

[0035] Preferably, the remaining rotating seats 21 are all fixedly mounted with threaded barrels 28 and limiting rods 27, and the threaded barrels 28 and limiting rods 27 are all slid through the corresponding mounting brackets 22 and square frames 19, and multiple fixed seats 8 are fixedly mounted on the mounting brackets 22 and square frames 19, and the multiple fixed seats 8 are all rotatably connected with screw rods 7, and the multiple screw rods 7 are screwed and extended into the multiple threaded barrels 28 in a one-to-one correspondence. Based on this, except for the rotating seat 21 and the adjusting wheel 20 connected to the telescopic end of the second hydraulic push rod 23, the remaining rotating seats 21 and the adjusting wheel 20 can adjust the distance between them and the steel bar by rotating the screw rod 7, and the rotating screw 7 makes the threaded barrel 28 move in the direction away from the fixed seat 8. The setting of the limiting rod 27 makes the threaded barrel 28 unable to rotate, so that the threaded barrel 28 drives the rotating seat 21 to move, and then the adjusting wheel 20 is against the steel bar, so that steel bars of different diameters can be straightened or bent.

[0036] In addition, regarding the transportation of the steel bars, a fixed frame 2 is fixedly installed on one side of the mounting frame 22 on the base 1, a rotatable driving wheel 25 is arranged in the fixed frame 2, a first hydraulic push rod 3 is fixedly installed in the fixed frame 2, the telescopic end of the first hydraulic push rod 3 is fixedly connected to the mobile frame 4, and a pressing wheel 26 is rotatably connected in the mobile frame 4. Based on this, the steel bars are placed on the driving wheel 25, the first hydraulic push rod 3 is started to push out the telescopic end, so that the mobile frame 4 drives the pressing wheel 26 to approach and press the steel bars, so that the steel bars are fixedly pressed between the driving wheel 25 and the pressing wheel 26, and then the driving wheel 25 is driven to rotate by the motor, and based on the friction between the steel bars and the driving wheel 25, the driving wheel 25 transports the steel bars to one side, which is convenient for subsequent processing.

[0037] In addition, in order to enable the steel bar to be bent in all directions, the following structure is preferably provided:

[0038] An annular bracket 5 is fixedly mounted on the base 1, a slide seat 33 is slidably connected inside the annular bracket 5, and the mounting frame 22 is fixedly mounted on the slide seat 33;

[0039] A gear ring 6 is fixedly mounted inside the annular bracket 5 , a rotatable gear 24 is provided inside the slide seat 33 , and the gear 24 is meshed with the gear ring 6 .

[0040] As can be seen from the above, the motor drives the gear 24 to rotate, and the gear 24 meshes with the gear ring 6, so that the gear 24 rolls in the gear ring 6, thereby making the slide 33 slide in the annular bracket 5, so that the mounting frame 22 rotates around the axis between the rings, and then the telescopic direction of the second hydraulic push rod 23 is changed. Based on the compression of the above-mentioned driving wheel 25 and the clamping wheel 26, the steel bar cannot rotate, so that when the second hydraulic push rod 23 pushes out the telescopic end, the steel bar can be bent in all directions. When performing continuous bending of the steel bar, the spatial bending processing of the steel bar can be realized to process products of more shapes, thereby improving the practicality of the equipment.

[0041] As mentioned above, after the steel bar is straightened or bent, in order to shear the steel bar, the following structure is preferably provided:

[0042] A cutting assembly is provided on the rotating base 14 . The cutting assembly and the square frame 19 are located on the same diameter of the rotating base 14 . The cutting assembly is an open structure on one side. The rotating base 14 can be rotated to allow the cutting assembly to move from the side to the upper and lower sides of the steel bar.

[0043] It can be seen from the above that when used as a straightening machine, the cutting assembly and the square frame 19 are located at the two ends of the same diameter of the rotating base 14. After the steel bar extends from the first adjustment assembly in the square frame 19, it continues to move to the cutting assembly, and the straightened steel bar can be directly sheared and segmented through the cutting assembly; when used as a bending machine, when the rotating base 14 moves the square frame 19 to one side, the cutting assembly also moves with the rotating base 14, and at this time the opening of the cutting assembly is facing the mounting frame 22. After the steel bar is bent, the steel bar continues to extend, and then the rotating base 14 is driven to rotate, so that the cutting assembly is close to the mounting frame 22, and at the same time the opening of the cutting assembly passes through the steel bar, so that the cutting assembly is located on the upper and lower sides of the steel bar, and the bent steel bar can be sheared by the cutting assembly.

[0044] As mentioned above, the cutting component is preferably configured as follows:

[0045] The cutting assembly includes a cutting bracket 11 and two cutter seats 12 symmetrically slidably connected to the cutting bracket 11. Cutters 13 are fixedly mounted on the two cutter seats 12, and the two cutters 13 are arranged opposite to each other.

[0046] A slide groove is provided on one side of the two cutter seats 12. A rotatable turntable 32 is provided in the cutting bracket 11. Two fixing rods which are symmetrically fixedly mounted on the turntable 32 and are respectively slidably matched with the two slide grooves.

[0047] As can be seen from the above, when the steel bar is sheared, the steel bar is located between the two cutters 13. At this time, the motor is started to drive the turntable 32 to rotate, so that the two fixed rods on the turntable 32 slide in the slide grooves on the two cutter seats 12, and at the same time, the two cutter seats 12 are close to each other, so that the two cutters 13 are close to each other to shear the steel bar. Based on the fact that the height position of the axis of the turntable 32 remains unchanged and is always flush with the center line position of the steel bar, the two cutters 13 can be automatically centered and sheared through the rotation of the turntable 32 to prevent the steel bar from bending when shearing.

[0048] In addition, when used as a straightening machine, in order to prevent the steel bars from bending due to the weight of the steel bars during the process of moving from the square frame 19 to the cutting assembly, it is preferably provided with the following structure:

[0049] A moving seat 15 is slidably connected between the cutting assembly and the square frame 19 on the rotating base 14, a rotatable eccentric wheel 10 is provided on the rotating base 14, a slide 16 is rotatably connected to one side of the eccentric wheel 10, a guide rod 17 is fixedly installed in the moving seat 15, and the slide 16 is slidably sleeved on the outer side of the guide rod 17, and a clamping assembly is provided on the top of the moving seat 15;

[0050] The clamping assembly includes two clamping plates 9 symmetrically and slidably connected to the top of the moving seat 15, and the bottom of the two clamping plates 9 are rotatably connected to the first connecting rod 30. A slide plate 29 is slidably sleeved on the guide rod 17, and a second connecting rod 31 is fixedly installed on the slide plate 29, and the ends of the second connecting rod 31 are rotatably connected to the two first connecting rods 30. The bottom of the slide plate 29 is fixedly connected to a spring 18 sleeved on the outside of the guide rod 17, and the slide 16 is located below the spring 18.

[0051] As can be seen from the above, the starting motor drives the eccentric wheel 10 to rotate, thereby driving the slide 16 to move in a circular trajectory, and then the slide 16 slides up and down on the guide rod 17, so that the guide rod 17 drives the moving seat 15 to reciprocate between the square frame 19 and the cutting assembly. Specifically, when the moving seat 15 moves toward the cutting assembly, the eccentric wheel 10 drives the slide 16 to move in the upper semicircular trajectory, so that the slide 16 moves horizontally and also moves upward. At this time, the slide 16 moves upward on the guide rod 17 to resist the spring 18, and drives the spring 18 to move upward, so that The slide plate 29 drives the second connecting rod 31 to move upward, and then one end of the two first connecting rods 30 moves upward, so that the two first connecting rods 30 drive the two clamping plates 9 to slide close to each other on the top of the moving seat 15, so that the two clamping plates 9 clamp the steel bar. After the steel bar is clamped, the spring 18 is compressed when the slide 16 continues to move. Based on the elastic force of the spring 18, the two clamping plates 9 always clamp the steel bar when the moving seat 15 moves toward the cutting assembly, so that the upper semicircular track of the slide 16 is moved to clamp and convey the steel bar to prevent the steel bar from bending.

[0052] When the moving seat 15 moves toward the square frame 19, the eccentric wheel 10 drives the slide 16 to move along the lower semicircular trajectory, so that the slide 16 moves downward while moving horizontally. At this time, the slide 16 moves downward on the guide rod 17 and disengages from the spring 18. The slide plate 29 and the spring 18 move downward due to their own gravity, and then the two clamps 9 move away from each other through the rotation between the second connecting rod 31 and the two first connecting rods 30, thereby releasing the clamping of the steel bars. In this way, the eccentric wheel 10 drives the slide 16 to move along a circular trajectory, so that while driving the reciprocating motion of the moving seat 15, the two clamps 9 can also be clamped on the way and released on the way back, so that the clamping assembly does not need to be equipped with additional driving equipment.

[0053] 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 construction steel bar processing device, comprising a base (1), characterized in that: The base (1) is provided with a mounting frame (22), the base (1) is provided with a rotatable rotating base (14), a square frame (19) is fixed on the rotating base (14), the mounting frame (22) and the square frame (19) are both provided with a first adjustment component, the mounting frame (22) is also provided with a second adjustment component, and the second adjustment component is located between the two first adjustment components, the first adjustment component and the second adjustment component both include two rotating seats (21) and an adjustment wheel (20) rotatably connected to the rotating seats (21), the two adjustment wheels (20) of the first adjustment component are arranged opposite to each other, the two adjustment wheels (20) of the second adjustment component are arranged in a staggered manner, and a second hydraulic push rod (23) is connected between one of the rotating seats (21) of the second adjustment component and the mounting frame (22).

2. A construction steel bar processing equipment according to claim 1, characterized in that: The remaining rotating seats (21) are all fixedly mounted with threaded barrels (28) and limiting rods (27), and the threaded barrels (28) and limiting rods (27) are slidably passed through the corresponding mounting frames (22) and square frames (19). The mounting frames (22) and square frames (19) are all fixedly mounted with a plurality of fixed seats (8), and the plurality of fixed seats (8) are all rotatably connected with screw rods (7), and the plurality of screw rods (7) are screwed together one by one and extend into the plurality of threaded barrels (28).

3. The construction steel bar processing equipment according to claim 1, characterized in that: A fixed frame (2) is fixedly mounted on the base (1) at one side of the mounting frame (22), a rotatable driving wheel (25) is provided in the fixed frame (2), a first hydraulic push rod (3) is fixedly mounted in the fixed frame (2), a telescopic end of the first hydraulic push rod (3) is fixedly connected to a moving frame (4), and a clamping wheel (26) is rotatably connected in the moving frame (4).

4. The construction steel bar processing equipment according to claim 1, characterized in that: An annular bracket (5) is fixedly mounted on the base (1), a sliding seat (33) is slidably connected inside the annular bracket (5), and the mounting frame (22) is fixedly mounted on the sliding seat (33).

5. A construction steel bar processing equipment according to claim 4, characterized in that: A gear ring (6) is fixedly installed in the annular bracket (5), a rotatable gear (24) is arranged in the sliding seat (33), and the gear (24) is meshed with the gear ring (6).

6. The construction steel bar processing equipment according to claim 1, characterized in that: The rotating base (14) is provided with a cutting assembly, the cutting assembly and the square frame (19) are located on the same diameter of the rotating base (14), the cutting assembly is a one-side open structure, and the cutting assembly can be moved from the side to the upper and lower sides of the steel bar through the rotation of the rotating base (14).

7. A construction steel bar processing equipment according to claim 6, characterized in that: The cutting assembly comprises a cutting bracket (11) and two cutter seats (12) symmetrically slidably connected to the cutting bracket (11), and a cutter (13) is fixedly mounted on each of the two cutter seats (12), and the two cutters (13) are arranged opposite to each other.

8. The construction steel bar processing equipment according to claim 7, characterized in that: A slide groove is provided on one side of the two cutter seats (12), a rotatable turntable (32) is provided in the cutting bracket (11), and two fixing rods which are symmetrically fixedly mounted on the turntable (32) and are respectively slidably matched with the two slide grooves.

9. The construction steel bar processing equipment according to claim 6, characterized in that: A movable seat (15) is slidably connected between the cutting assembly and the square frame (19) on the rotating base (14), a rotatable eccentric wheel (10) is provided on the rotating base (14), a slide (16) is rotatably connected to one side of the eccentric wheel (10), a guide rod (17) is fixedly installed in the movable seat (15), and the slide (16) is slidably sleeved on the outer side of the guide rod (17), and a clamping assembly is provided on the top of the movable seat (15).

10. A construction steel bar processing equipment according to claim 9, characterized in that: The clamping assembly comprises two clamping plates (9) symmetrically slidably connected to the top of the movable seat (15), the bottoms of the two clamping plates (9) are rotatably connected to the first connecting rod (30), a slide plate (29) is slidably sleeved on the guide rod (17), a second connecting rod (31) is fixedly installed on the slide plate (29), and the ends of the second connecting rod (31) are rotatably connected to the two first connecting rods (30), the bottom of the slide plate (29) is fixedly connected to a spring (18) sleeved on the outside of the guide rod (17), and the slide (16) is located below the spring (18).

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