Forging cutting device

Abstract

A forge piece cutting device comprises a workbench, supporting legs are arranged at the bottom end of the workbench, a pushing and jacking mechanism is arranged on the left side of the top end of the workbench, a cutting mechanism is arranged on the right side of the top end of the workbench, and a clamping mechanism is arranged between the cutting mechanism and the pushing and jacking mechanism and comprises two parallel displacement grooves. Side clamping assemblies capable of adjusting the clamping width are arranged in the displacement grooves, adjusting assemblies for adjusting the clamping width of the side clamping assemblies are arranged in the displacement grooves, and a downward pressing fixing assembly is arranged at the top end of the portion, between the displacement grooves, of the workbench. According to the utility model, continuous cutting of a plurality of forgings can be realized, the device can adapt to forgings with various diameters, the cutting efficiency and precision are effectively improved, and diversified industrial production requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of forge piece processing, especially a forge piece cutting device. BACKGROUND

[0002] As a key basic component in many industrial fields, the quality and precision of forge pieces play a crucial role in the performance and reliability of the final product. The cutting process is an important link in the processing of forge pieces. Accurate and efficient cutting not only ensures that the forge pieces meet the predetermined size specifications, but also provides a good foundation for subsequent processing procedures, thereby improving the efficiency of the entire production process and product quality.

[0003] In the prior art, a cutting device for forge pieces with the application number CN202420553058.8 is provided. The device is equipped with two support seats symmetrically arranged on the left end of the cutting table upper surface, and cooperates with components such as the light pole, distance plate, adjusting screw, etc. The movement of the moving block is achieved by setting a rectangular column and a translation screw on the upper end of the support seat. This allows the cutting motor and cutting wheel installed on the mounting plate at the bottom of the moving block to perform cutting operations. The limiting seat on the right end of the cutting table upper surface is equipped with equidistant V-shaped grooves and a fixing mechanism, which can facilitate the fixation of forge pieces and allow for equal-length cutting of multiple forge pieces at one time, thereby improving cutting efficiency to a certain extent. However, the technology gradually exposes some defects in actual application. On the one hand, the device can only perform single cutting on forge pieces and cannot perform continuous cutting operations according to specific use scenarios and production requirements, which is particularly inconvenient in situations that require continuous cutting to improve production efficiency or meet specific process requirements, limiting its application in a wider range of production scenarios. On the other hand, the opening angle of the V-shaped groove on the limiting seat is fixed and cannot be adjusted, which makes the device unable to widely adapt to the cutting needs of forge pieces of different diameters. When facing forge pieces with large differences in diameter, problems such as unstable fixation or affected cutting precision may occur, which cannot meet the actual needs of diversified forge piece cutting processing.

[0004] In summary, the existing forge piece cutting device has deficiencies in flexibility of cutting function and adaptability to different sizes of forge pieces. In view of this, we propose a forge piece cutting device to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a forge piece cutting device, which is used to work and solve the existing problems in the background technology.

[0006] In order to achieve the above object, the utility model provides technical scheme for: a forge piece cutting device, including the work table, the bottom of work table is provided with the support leg, the top left side of work table is provided with the push mechanism, the top right side of work table is provided with cutting mechanism, be provided with clamping mechanism between cutting mechanism and push mechanism, clamping mechanism includes two parallel displacement slot, adjustable side clamping assembly of clamping width is provided in displacement slot, adjustment assembly of the clamping width of side clamping assembly is provided in displacement slot, the top of work table between two displacement slot is provided with the down pressure fixed component.

[0007] Preferably, the side clamping assembly includes a displacement block slidingly connected in the displacement slot, the top of the displacement block is provided with at least four uniformly distributed connecting blocks, the top of the connecting block is hinged with two first connecting rods, the end of the first connecting rod away from the connecting block is hinged with a second connecting rod, the two second connecting rods are rotatably connected with a support rod, the two ends of the support rod are fixedly connected with the inner wall of the displacement slot, the end of the second connecting rod away from the first connecting rod is fixedly connected with a clamping plate, and the side of the two clamping plates close to each other is rotatably connected with a rotating stick.

[0008] Preferably, the adjustment assembly includes a first screw rod, the surface of the first screw rod is threadedly connected with the displacement block, the top of the first screw rod is rotatably connected with a containing plate, the containing plate is fixedly arranged between the two side walls of the displacement slot, the bottom of the first screw rod is rotatably connected with a shell, the top of the shell is fixedly connected with the bottom of the work table, the surface of the first screw rod is fixedly connected with a worm gear in the shell, one side of the worm gear is meshingly connected with a worm, the worm is rotatably connected with the inner wall of the shell, and one end of the worm is drivingly connected with a first motor through the side wall of the shell.

[0009] Preferably, the down pressure fixed component includes a first gantry, the first gantry is parallel to the displacement slot and is fixedly installed at the top of the work table, an electric push rod is arranged at the top center position of the first gantry, and the extended end of the electric push rod is fixedly connected with a pressing plate through the cross beam of the first gantry.

[0010] Preferably, the push mechanism includes a first sliding groove opened at the top of the work table, the first sliding groove is perpendicular to the displacement slot, a first sliding block is slidingly connected in the first sliding groove, a push plate is fixedly arranged at the top of the first sliding block, a second screw rod is rotatably connected between the inner walls of the two ends of the first sliding groove, the surface of the second screw rod is threadedly connected with the first sliding block, and the end of the second screw rod away from the clamping mechanism is drivingly connected with a second motor through the inner wall of the first sliding groove.

[0011] Preferably, two groups of symmetrical mounting plates are arranged at the two sides of the first sliding groove at the top of the work table, a guide rod is fixedly installed between one group of mounting plates, and the guide rod is slidingly connected with the push plate.

[0012] Preferably, the cutting mechanism comprises a second gantry, a second sliding groove is formed in the bottom end of the beam of the second gantry, a second sliding block is slidably connected in the second sliding groove, a third screw rod is rotatably connected between the inner walls of the two ends of the second sliding groove, the surface of the third screw rod is threadedly connected with the second sliding block, and one end of the third screw rod is drivingly connected with a third motor penetrating through the inner wall of the second sliding groove.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. The multiple forgings are continuously cut, in the cutting process, when the cutting saw of the cutting mechanism starts to cut the multiple forgings fixed on the clamping mechanism, the push mechanism can play a role in time according to the cutting progress, the second motor in the push mechanism is started to drive the second screw rod to rotate, the first sliding block which is threadedly connected with the second screw rod and slides in the first sliding groove moves, and the push plate fixed on the top end of the first sliding block is pushed to the clamping mechanism, so that the forging placed on the clamping plate and abutting against the push plate at one end is continuously applied with a pushing force, the forgings can continuously move to the lower side of the cutting mechanism, the cutting saw can continuously cut the multiple forgings without pausing and waiting for the forgings to be repositioned, the continuous cutting operation is realized, the total time required for cutting multiple forgings is shortened, the production efficiency is improved, and the demand for cutting continuity of forgings under some specific process requirements can be better met, and the forgings after cutting are more in line with production standards in terms of size precision.

[0015] 2. More diameter sizes of forgings can be effectively cut, the side clamping assembly and the downward pressing fixing assembly in the clamping mechanism work cooperatively to clamp and fix the forgings from different directions, the side clamping assembly can flexibly adjust the clamping width according to the diameter size of the forgings, the first motor of the adjusting assembly is started to drive the worm to rotate, the worm gear meshed with the worm and the first screw rod connected with the worm gear are driven to rotate, the rotation of the first screw rod makes the displacement block slide in the displacement groove, the displacement block drives the clamping plate to change the position and angle through the connecting rod structure composed of the connecting block, the first connecting rod and the second connecting rod, so that the adaptability clamping of forgings with different diameter sizes is realized, and the downward pressing fixing assembly drives the pressing plate to press downward above the forgings through the electric push rod, so that the stability of the forgings in the cutting process is further ensured, the device can effectively cope with forgings with various diameter sizes, whether the forgings are thin or thick, the forgings can be stably fixed and accurately cut on the device, the application range of the device is greatly widened, and the actual demand for cutting and machining of diversified forgings in different production scenes is met. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 is a structural schematic view of the side clamping assembly in the utility model;

[0018] Figure 3 is a structural schematic view of the adjusting assembly in the utility model;

[0019] Figure 4 is a structural schematic view of the downward pressing fixing assembly in the utility model;

[0020] Figure 5 is a structural schematic view of the workbench in the utility model;

[0021] Figure 6 is a structural schematic view of the cutting mechanism in the utility model.

[0022] In the figure: 1, workbench; 2, pushing mechanism; 21, first sliding groove; 22, first sliding block; 23, second screw rod; 24, second motor; 25, push plate; 26, mounting plate; 27, guide rod; 3, cutting mechanism; 31, second gantry frame; 32, second sliding groove; 33, second sliding block; 34, third screw rod; 35, third motor; 36, cutting saw; 4, clamping mechanism; 41, displacement slot; 42, side clamping assembly; 421, displacement block; 422, connecting block; 423, first connecting rod; 424, second connecting rod; 425, supporting rod; 426, clamping plate; 427, rotating stick; 43, adjusting assembly; 431, first screw rod; 432, containing plate; 433, shell; 434, worm wheel; 435, worm; 436, first motor; 44, downward pressing fixing assembly; 441, first gantry frame; 442, electric push rod; 443, pressing plate; 5, supporting leg. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] In order to further understand the content of the utility model, the utility model will be described in detail with reference to the drawings.

[0025] In combination with the drawings Figures 1-6The utility model provides a forging cutting device, including workbench 1, the bottom end of workbench 1 is provided with support leg 5, the top left side of workbench 1 is provided with push mechanism 2, the top right side of workbench 1 is provided with cutting mechanism 3, and the cutting mechanism 3 is provided with clamping mechanism 4 between push mechanism 2, clamping mechanism 4 includes two parallel displacement grooves 41, and the adjustable side clamping assembly 42 of clamping width is arranged in displacement groove 41, and the adjusting assembly 43 of adjusting the clamping width of side clamping assembly 42 is arranged in displacement groove 41, and the top of workbench 1 is provided with the fixed assembly 44 of pressing down between two displacement grooves 41, according to the diameter size of forging by adjusting assembly 43 adjusting side clamping assembly 42 clamping width, places the forging on side clamping assembly 42, and is fixed with the fixed assembly 44 of pressing down in different directions to forging, ensure that the displacement of forging does not occur in the cutting process, and the end of forging is touched on push mechanism 2, when cutting starts, and push mechanism 2 gives the push force of forging, makes forging continuously move towards the below of cutting mechanism 3, after push mechanism 2 pushes forging to the appropriate position, push mechanism 2 stops the push of forging, and cutting mechanism 3 cuts the forging, and cutting mechanism 3 and push mechanism 2 and clamping mechanism 4 cooperate to complete the whole cutting process.

[0026] Side clamping assembly 42 includes displacement block 421 slidingly connected in displacement groove 41, the top of displacement block 421 is provided with at least four evenly distributed connecting blocks 422, the top of connecting block 422 is hinged with two first connecting rods 423, the end of first connecting rod 423 away from connecting block 422 is hinged with second connecting rod 424, two second connecting rods 424 are rotatably connected with support rod 425 between the both ends of support rod 425 and the inner wall of displacement groove 41, the end of second connecting rod 424 away from first connecting rod 423 is fixedly connected with clamping plate 426, two clamping plates 426 are rotatably connected with rotating stick 427 on the side of each other, and the connecting block 422, first connecting rod 423, second connecting rod 424 and support rod 425 form a connecting rod structure, the displacement movement of connecting block 422 can drive clamping plate 426 fixedly connected with second connecting rod 424 to change angle and position, so as to reach the effect of adjusting clamping width, rotating stick 427 reduces the friction between clamping plate 426 and forging when push mechanism 2 pushes forging, prevents the surface of forging from being scratched, and also helps to clamp the forgings of different diameters more closely.

[0027] The adjusting assembly 43 comprises a first lead screw 431, the surface of the first lead screw 431 is threadedly connected with the displacement block 421, the top end of the first lead screw 431 is rotationally connected with a containing plate 432, the containing plate 432 is fixedly arranged between the two side walls of the displacement groove 41, the bottom end of the first lead screw 431 is rotationally connected with a shell 433, the top end of the shell 433 is fixedly connected with the bottom end of the workbench 1, the surface of the first lead screw 431 is fixedly connected with a worm gear 434 in the shell 433, one side of the worm gear 434 is meshingly connected with a worm shaft 435, the worm shaft 435 is rotationally connected with the inner wall of the shell 433, one end of the worm shaft 435 is drivingly connected with a first motor 436 through the side wall of the shell 433, the first motor 436 is started, the first motor 436 drives the worm shaft 435 to rotate, the rotation of the worm shaft 435 drives the worm gear 434 to rotate, and then the first lead screw 431 rotates, in the process of the rotation of the first lead screw 431, the displacement block 421 moves up and down in the displacement groove 41, and then the connecting block 422 at the top end of the displacement block 421 also moves up and down, so that the width clamped by the side clamping assembly 42 is adjusted.

[0028] The downward pressing fixing assembly 44 comprises a first gantry 441, the first gantry 441 is parallel to the displacement groove 41 and is fixedly arranged at the top end of the workbench 1, a electric push rod 442 is arranged at the center position of the top end of the first gantry 441, the extending end of the electric push rod 442 is fixedly connected with a pressing plate 443 through the cross beam of the first gantry 441, the electric push rod 442 is started, the extending end of the electric push rod 442 starts to extend downward, the pressing plate 443 moves downward, and the pressing plate 443 stably presses on the upper side of the forging.

[0029] The pushing mechanism 2 comprises a first sliding groove 21 arranged at the top end of the workbench 1, the first sliding groove 21 is perpendicular to the displacement groove 41, a first sliding block 22 is slidingly connected in the first sliding groove 21, a pushing plate 25 is fixedly arranged at the top end of the first sliding block 22, a second lead screw 23 is rotationally connected between the inner walls of the two ends of the first sliding groove 21, the surface of the second lead screw 23 is threadedly connected with the first sliding block 22, the end of the second lead screw 23 away from the clamping mechanism 4 is drivingly connected with a second motor 24 through the inner wall of the first sliding groove 21, the second motor 24 drives the second lead screw 23 to rotate, when the second lead screw 23 rotates, the first sliding block 22 moves along the first sliding groove 21, the pushing plate 25 fixedly arranged at the top end of the first sliding block 22 moves to the clamping mechanism 4 along with the movement of the first sliding block 22, so that the pushing plate 25 exerts a pushing force on the forging placed on the clamping plate 426 and abutting against the pushing plate 25.

[0030] The workbench 1 top end is provided with two groups of symmetrical mounting plates 26 on both sides of the two ends of the first sliding groove 21, a group of mounting plates 26 is fixedly provided with a guide rod 27, the guide rod 27 is slidably connected with the push plate 25, the guide rod 27 provides guidance and support for the movement of the push plate 25, ensures that the push plate 25 can move stably and accurately during the pushing process, prevents the push plate 25 from deviating or shaking, and thus improves the pushing precision and stability.

[0031] The cutting mechanism 3 comprises a second gantry 31 which is parallel to the displacement groove 41 and is fixedly installed at the top end of the workbench 1, a second sliding groove 32 is formed in the bottom end of the beam of the second gantry 31, a second sliding block 33 is slidably connected in the second sliding groove 32, a motor-driven cutting saw 36 is installed at the bottom end of the second sliding block 33, a third screw rod 34 is rotatably connected between the inner walls of the two ends of the second sliding groove 32, the surface of the third screw rod 34 is threadedly connected with the second sliding block 33, one end of the third screw rod 34 penetrates through the inner wall of the second sliding groove 32 and is drivingly connected with a third motor 35, the third motor 35 drives the third screw rod 34 to rotate, the rotation of the third screw rod 34 causes the second sliding block 33 to slide in the second sliding groove 32, and with the movement of the second sliding block 33, the cutting saw 36 simultaneously cuts the plurality of forgings which are fixed on the clamping mechanism 4 and have been pushed to the cutting position.

[0032] Working principle:

[0033] Firstly, according to the size of the to-be-cut forgings, the clamping plates in the clamping mechanism 4 need to be adjusted accordingly to adapt to the forgings, and the specific operation is to start the first motor 436 of the adjusting assembly 43, the first motor 436 starts to rotate and drives the connected worm 435 to rotate, since the worm 435 is meshed with the worm gear 434 fixedly connected with the first screw rod 431, the rotation of the worm 435 drives the worm gear 434 to rotate, and then the first screw rod 431 rotates, the surface of the first screw rod 431 is threadedly connected with the displacement block 421, and the displacement block 421 is slidably connected in the displacement groove 41, during the rotation of the first screw rod 431, the displacement block 421 moves up and down in the displacement groove 41, with the movement of the displacement block 421, the clamping plate 426 changes the angle and position through the connecting block 422, the first connecting rod 423, the second connecting rod 424 and the supporting rod 425, so as to realize the accurate adjustment of the angle of the two clamping plates 426 according to the size of the forgings.

[0034] After the angle adjustment of the finished clamp plate 426 is completed, the multiple forgings to be cut are placed on the clamp plate 426, one end of the forgings is placed on the push plate 25 of the push-up mechanism 2, and then the electric push rod 442 in the downward pressing assembly 44 is started. The extended end of the electric push rod 442 starts to expand, pushing the pressing plate 443 connected with the electric push rod 442 to move downward until the pressing plate 443 is stably pressed above the forgings. Through the clamping from the side of the clamp plate 426 and the downward pressing from above of the pressing plate 443, the stable fixing of the multiple forgings is completed, ensuring that the forgings will not shift during the subsequent cutting process, providing a stable basis for accurate cutting.

[0035] After the forgings are fixed, the second motor 24 of the push-up mechanism 2 is started. The rotation of the second motor 24 drives the rotation of the second screw rod 23. When the second screw rod 23 rotates, the first sliding block 22 moves along the first sliding groove 21 because the surface of the second screw rod 23 is threadedly connected with the first sliding block 22 and the first sliding block 22 slides in the first sliding groove 21. The top end of the first sliding block 22 is fixedly provided with the push plate 25. With the movement of the first sliding block 22, the push plate 25 approaches the clamping mechanism 4, thereby applying a pushing force to the forgings placed on the clamp plate 426 and having one end abutting against the push plate 25, so that the forgings continuously move downward of the cutting mechanism 3. In this process, the pushing operation of the forgings can be paused in time according to the actual cutting length required, so as to facilitate subsequent accurate cutting.

[0036] When the forgings are pushed up to the appropriate position, the third motor 35 of the cutting mechanism 3 is started. The rotation of the third motor 35 drives the rotation of the third screw rod 34. The rotation of the third screw rod 34 causes the second sliding block 33 threadedly connected with the third screw rod 34 to slide in the second sliding groove 32. Since the bottom end of the second sliding block 33 is provided with the motor-driven cutting saw 36, with the movement of the second sliding block 33, the cutting saw 36 simultaneously cuts the multiple forgings fixed on the clamping mechanism 4 and pushed up to the cutting position. Through the movement cutting of the cutting saw 36, the forgings can be cut into sizes meeting the production requirements according to the predetermined cutting length and requirements, and the entire forging cutting process is completed.

[0037] In the entire working process, the mechanisms closely cooperate, and through accurate mechanical transmission and control, efficient and accurate cutting of multiple forgings is realized, meeting the diversified industrial production requirements.

[0038] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A forging cutting device, comprising a workbench (1), the bottom end of the workbench (1) is provided with a supporting leg (5), characterized in that: The top left side of the workbench (1) is provided with a push-up mechanism (2), the top right side of the workbench (1) is provided with a cutting mechanism (3), the cutting mechanism (3) and the push-up mechanism (2) are provided with a clamping mechanism (4), the clamping mechanism (4) includes two parallel displacement grooves (41), the displacement groove (41) is provided with a side clamping assembly (42) capable of adjusting the clamping width, the displacement groove (41) is provided with an adjusting assembly (43) for adjusting the clamping width of the side clamping assembly (42), and the top of the workbench (1) between the two displacement grooves (41) is provided with a downward pressing fixing assembly (44).

2. A device for cutting a forging according to claim 1, characterized in that: The side clamping assembly (42) includes a displacement block (421) slidingly connected in the displacement groove (41), the top of the displacement block (421) is provided with at least four uniformly distributed connecting blocks (422), the top of the connecting block (422) is hingedly connected with two first connecting rods (423), the end of the first connecting rod (423) away from the connecting block (422) is hingedly connected with a second connecting rod (424), the two second connecting rods (424) are rotatably connected with a supporting rod (425), the two ends of the supporting rod (425) are fixedly connected with the inner wall of the displacement groove (41), and the end of the second connecting rod (424) away from the first connecting rod (423) is fixedly connected with a clamping plate (426). The side of the two clamping plates (426) close to each other is rotatably connected with a rotating stick (427).

3. A device for cutting a forging according to claim 2, wherein: The adjusting assembly (43) includes a first lead screw (431), the surface of the first lead screw (431) is threadedly connected with the displacement block (421), the top of the first lead screw (431) is rotatably connected with a containing plate (432), the containing plate (432) is fixedly arranged between the two side walls of the displacement groove (41), the bottom of the first lead screw (431) is rotatably connected with a shell (433), the top of the shell (433) is fixedly connected with the bottom of the workbench (1), the surface of the first lead screw (431) is fixedly connected with a worm wheel (434) in the shell (433), one side of the worm wheel (434) is meshingly connected with a worm (435), the worm (435) is rotatably connected with the inner wall of the shell (433), and one end of the worm (435) is drivingly connected with a first motor (436) penetrating through the side wall of the shell (433).

4. The apparatus of claim 1 wherein: The downward pressing fixing assembly (44) includes a first gantry (441), the first gantry (441) is parallel to the displacement groove (41) and is fixedly installed on the top of the workbench (1), the top center position of the first gantry (441) is provided with an electric push rod (442), and the extension end of the electric push rod (442) is fixedly connected with a pressing plate (443) penetrating through the cross beam of the first gantry (441).

5. The apparatus of claim 1 wherein: The pushing mechanism (2) comprises a first sliding groove (21) formed in the top end of the workbench (1), the first sliding groove (21) is perpendicular to the displacement groove (41), the first sliding groove (21) is slidably connected with a first sliding block (22), the top end of the first sliding block (22) is fixedly provided with a push plate (25), the two end inner walls of the first sliding groove (21) are rotatably connected with a second lead screw (23), the surface of the second lead screw (23) is threadedly connected with the first sliding block (22), and the end, away from the clamping mechanism (4), of the second lead screw (23) is drivingly connected with a second motor (24) penetrating through the inner wall of the first sliding groove (21).

6. A swage cutting device according to claim 5, wherein: Two groups of symmetrical mounting plates (26) are arranged on the two sides of the top end of the workbench (1) at the two ends of the first sliding groove (21), a group of the mounting plates (26) are fixedly installed with a guide rod (27), and the guide rod (27) is slidably connected with the push plate (25).

7. The apparatus of claim 1 wherein: The cutting mechanism (3) comprises a second gantry (31), the second gantry (31) is parallel to the displacement groove (41) and is fixedly installed on the top end of the workbench (1), the bottom end of the beam of the second gantry (31) is provided with a second sliding groove (32), the second sliding groove (32) is slidably connected with a second sliding block (33), the bottom end of the second sliding block (33) is provided with a motor-driven cutting saw (36), the two end inner walls of the second sliding groove (32) are rotatably connected with a third lead screw (34), the surface of the third lead screw (34) is threadedly connected with the second sliding block (33), and one end of the third lead screw (34) is drivingly connected with a third motor (35) penetrating through the inner wall of the second sliding groove (32).

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