CN109940212B

CN109940212B - Portal shearing machine

Info

Publication number: CN109940212B
Application number: CN201910377834.7A
Authority: CN
Inventors: 许洪龙; 薛震天
Original assignee: Jiangyin Polytechnic College
Current assignee: Jiangyin Polytechnic College
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2024-04-30
Anticipated expiration: 2039-05-05
Also published as: CN109940212A

Abstract

The invention discloses a gantry shearing machine which comprises a gantry, a shearing mechanism, a pushing mechanism and a feed box; the portal frame comprises a top plate and supporting columns vertically fixed at two ends of the top plate, and an inner frame is formed together; the shearing mechanism comprises an upper cutter body and a lower cutter body which can move oppositely, the lower cutter body is fixed at the bottom of the portal frame, and the upper cutter body is fixed below the top plate through a first oil cylinder and can perform linear motion in the vertical direction relative to the lower cutter body through vertical driving of the first oil cylinder; the pushing mechanism is arranged at the rear side of the portal frame and can push materials positioned at the top of the lower cutter body; the workbin set up in the front side of portal frame, and be located the lower part of lower cutter body, come from shearing mechanism's material can fall into the workbin. The invention can cut the plate into small blocks, has high production efficiency, and ensures safety without the need of personnel directly participating in the working in the whole middle process.

Description

Portal shearing machine

Technical Field

The invention relates to the technical field of metal cutting processing and solid waste resource recycling treatment, in particular to a gantry shearing machine.

Background

When smelting metal, a temperature balance block is needed, the balance block generally needs to be small in size and convenient to control quality, so that a large (plate-shaped or strip-shaped) integral metal plate needs to be cut and processed into small metal squares with smaller volumes. In the existing small metal block shearing process, the current common method mainly uses a crusher to crush materials, but the crusher has high cost, high energy consumption and relatively low production efficiency. The other process is to manually cut for the second time, but the process has more potential safety hazards and low efficiency because of personnel participation.

Disclosure of Invention

This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.

The present invention has been made in view of the above and/or problems associated with the prior art cutting of small metal cubes.

Therefore, one of the purposes of the invention is to provide a gantry cutting machine, which has high production efficiency and almost does not need personnel to directly participate.

In order to solve the technical problems, the invention provides the following technical scheme: a gantry shearing machine comprises a gantry, a shearing mechanism, a pushing mechanism and a feed box; the portal frame comprises a top plate and supporting columns vertically fixed at two ends of the top plate, and an inner frame is formed together; the shearing mechanism comprises an upper cutter body and a lower cutter body which can move oppositely, the lower cutter body is fixed at the bottom of the portal frame, and the upper cutter body is fixed below the top plate through a first oil cylinder and can perform linear motion in the vertical direction relative to the lower cutter body through vertical driving of the first oil cylinder; the pushing mechanism is arranged at the rear side of the portal frame and can push materials positioned at the top of the lower cutter body; the workbin set up in the front side of portal frame, and be located the lower part of lower cutter body, come from shearing mechanism's material can fall into the workbin.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the upper cutter body comprises an upper cutter seat, a first support column transversely arranged at the bottom of the upper cutter seat, upper blades fixed at the lower ends of the support columns, and guide plates fixed at two transverse sides of the upper cutter seat; the lower cutter body comprises a lower cutter seat, second support posts which are fixed on the upper part of the lower cutter seat and staggered with the first support posts, and lower blades fixed on the upper ends of the second support posts.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the thickness of the upper blade is greater than that of the first pillar, and the thickness of the lower blade is greater than that of the second pillar.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: and a slope plate is fixed in the interval between the second support posts, a discharge hopper is arranged on the outer side of the slope plate, the discharge hopper is inclined downwards, and the lower end of the discharge hopper is positioned right above the feed box.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the inner side surface of the supporting column is symmetrically provided with vertical guide rails corresponding to the guide plates, and the guide plates on two sides of the upper cutter body are respectively embedded into the corresponding vertical guide rails and can vertically slide relatively.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the pushing mechanism comprises a mounting seat fixed on the rear side of the top plate, a second oil cylinder hinged with the mounting seat and with a piston rod downward, a movable joint connected to the lower end of the piston rod of the second oil cylinder, and guide grooves symmetrically arranged on two sides of the movable joint; the movable joint can slide along a preset track of the guide groove under the pushing of the second oil cylinder.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: one end of the guide groove is positioned at the upper part of the lower blade and is horizontal and longitudinal, and the other end of the guide groove is bent and then faces upwards and is vertical.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the movable joint comprises cross bars which are parallel to each other and connecting sheets for connecting the cross bars; the middle position of the cross rod is provided with a reducing area, and the end part of the connecting sheet is movably connected with the reducing area.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: a sleeve ring is fixed at the lower end of a piston rod of the second oil cylinder and sleeved on a reducing area of the uppermost cross rod; the two ends of the cross rod are respectively embedded into the corresponding guide grooves.

As a preferable scheme of the gantry shearing machine, the invention comprises the following steps: the device also comprises a rejecting mechanism; the removing mechanism is positioned at the upper part of the lower blade and comprises a cross beam with two ends fixed on support columns at two sides respectively, the cross beam is provided with a pair of parallel cross beams, teeth corresponding to the intervals of the upper blades are arranged between the two cross beams, and the upper blades can be inserted into the corresponding teeth intervals.

The invention has the beneficial effects that: the invention can cut the plate into small blocks, has high production efficiency, and ensures safety without the need of personnel directly participating in the working in the whole middle process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a front side view of a gantry cutter.

Fig. 2 is a detailed view of the whole structure and part of the structure of the shearing mechanism.

Fig. 3 is a structural view of the upper blade body.

Fig. 4 is a structural view of the lower cutter body.

Fig. 5 is a rear side view of the gantry cutter.

Fig. 6 is a block diagram of a push mechanism.

Fig. 7 is a view showing the mounting position of the rejecting mechanism and a detailed view of its partial structure.

Fig. 8 is a block diagram of the entire structure of the reject mechanism.

Fig. 9 is an exploded view of the rejection mechanism.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Referring to fig. 1 to 9, a first embodiment of the present invention provides a gantry shearing machine capable of cutting a sheared material (metal lath) and cutting it into small square structures. The gantry shearing machine comprises a gantry 100 and a shearing mechanism 200 arranged in the frame of the gantry 100. The portal frame 100 includes a horizontal top plate 101 and support columns 102 vertically fixed to both ends of the top plate 101. The shearing mechanism 200 includes an upper blade 201 and a lower blade 202 that are movable toward each other.

The upper blade 201 is fixed to the lower side of the top plate 101 by a first cylinder 203, and is driven by the first cylinder 203 to perform linear movement in the vertical direction with respect to the lower blade 202. The first cylinder 203 is fixed on the top plate 101, and the piston rod faces downwards; the top of the upper cutter body 201 is provided with an oil cylinder connecting seat, and the lower end of a piston rod of the first oil cylinder 203 is fixed with the oil cylinder connecting seat to realize transmission. Specifically, the upper blade body 201 includes an upper blade holder 201a, first supporting columns 201b laterally arranged at the bottom of the upper blade holder 201a, and upper blades 201c fixed to the lower ends of the respective first supporting columns 201 b. The single first supporting column 201b is a plate structure vertically fixed to the bottom of the upper tool holder 201a, and the first supporting columns 201b are simultaneously arranged in plurality side by side along the lateral direction.

The lower blade 202 is fixed to the bottom of the gantry 100. The lower cutter body 202 includes a lower cutter holder 202a, second supports 202b fixed to an upper portion of the lower cutter holder 202a and staggered with the respective first supports 201b, and lower blades 202c fixed to upper ends of the respective second supports 202 b. Thus, the upper blades 201c and the lower blades 202c are also formed in a staggered arrangement, and preferably, the interval between each adjacent upper blade 201c is equal to the thickness of the lower blade 202c, and the interval between each adjacent lower blade 202c is equal to the thickness of the upper blade 201 c. Accordingly, the respective first struts 201b are arranged equidistantly in the lateral direction and vertically downward; each second strut 202b is equally spaced in the lateral direction and vertically upward.

The upper blade body 201 can be inserted into the space between the corresponding lower blades 202c by a straight up-and-down vertical movement of each upper blade 201 c. Thus, if the metal lath is placed laterally on top of the upper blade 201c, the staggered upper blade 201c can be pressed downward, shearing the metal lath into a plurality of metal block structures. Preferably, the thickness of the upper blade 201c is equal to the thickness of the lower blade 202c, so that the size of the square cut by the cutting mechanism 200 is equal.

Further, guide plates 201d are symmetrically fixed at two lateral sides of the upper cutter body 201, vertical guide rails 102a corresponding to the guide plates 201d are symmetrically arranged on the inner side surfaces of the support columns 102, and the guide plates 201d at two sides of the upper cutter body 201 are respectively embedded into the corresponding vertical guide rails 102a and can vertically slide relatively. Preferably, the outer surface of the guide plate 201d is provided with a guide wear-resistant layer made of wear-resistant material.

Further, the upper end of the upper blade 201c is connected to the lower end of the first pillar 201b by a socket head cap screw, and the bottom surface of the upper blade 201c is recessed with a groove fitted to the head of the screw, so that the socket head cap screw can be completely immersed into the upper blade 201c after being fixed. Similarly, the lower end of the lower blade 202c is connected to the upper end of the second support 202b by a socket head cap screw, and the top surface of the lower blade 202c is recessed with a groove that fits the head of the screw, so that the socket head cap screw can be completely immersed in the lower blade 202c after being fixed.

Further, the thickness of the upper blade 201c is greater than the first leg 201b, and the thickness of the lower blade 202c is greater than the second leg 202b. Thus, the square cut by the upper blade 201c can be pushed down into the space between the second support posts 202b by the upper blade 201c, and since the thickness of the lower blade 202c is greater than that of the second support posts 202b, the space between the second support posts 202b is greater than that of the upper blade 201c (i.e., the thickness of the square), and finally the square pushed into between the second support posts 202b can be dropped without side friction.

Further, the upper end of the upper blade 201c is fixed to the corresponding first pillar 201b, and the lower end has a longitudinal limit groove 201c-1, and in a transverse projection, the limit groove 201c-1 makes the structure of the upper blade 201c form a "U" structure. When the upper blade 201c moves downward, the protruding portions on both sides have a motion limiting effect on the sheared material, preventing the position change of the sheared material caused by the absence of the action of the pressing device in the shearing process, thereby ensuring the normal shearing without the pressing device.

Further, a ramp plate 202d is fixed in the space between each adjacent second support column 202b, and the ramp plate 202d is a plate structure which is obliquely arranged and is inclined downward from inside to outside. The sheared square blocks, if dropped from the space of the second support 202b, can fall on the slope plate 202d at the bottom and slide out in a proper manner.

The gantry clipping machine further includes a feed box 400 disposed at the front side of the gantry 100 and located at the lower portion of the lower cutter body 202. In addition, a discharge hopper 202e is arranged on the outer side of the slope plate 202d, the upper end of the discharge hopper 202e is fixed on the outer edge of the slope plate 202d, and the lower end of the discharge hopper 202e is inclined downwards and extends to the position right above the material box 400. The material sliding off the ramp 202d can slide onto the hopper 202e and be guided by the hopper 202e to finally fall into the bin 400 at the lower end of the hopper 202 e.

Further, the rear side of the lower cutter body 202 has a receiving platform 202f, the receiving platform 202f is fixed (preferably in an integral structure) with the lower cutter seat 202a, and the upper end surface of the receiving platform 202f is flush with the top of the lower cutter blade 202 c. The metal lath to be sheared can rest temporarily on the receiving platform 202f, pushing it to the top of the lower blade 202c when shearing is required.

The gantry clipping machine further comprises a pushing mechanism 300 fixed at the rear side of the gantry 100, which can ensure continuous automatic feeding of the clipped material and automatic discharging of the finished product.

Specifically, the pushing mechanism 300 includes a mounting seat 301 fixed on the rear side of the top plate 101, a second oil cylinder 302 hinged to the mounting seat 301 and having a piston rod facing downward, a movable joint 303 connected to the lower end of the piston rod of the second oil cylinder 302, and guide grooves 304 symmetrically disposed on two sides of the movable joint 303. The extending path of the guide groove 304 is a predetermined path, and determines the sliding path of the movable joint 303. The movable joint 303 can slide along a predetermined trajectory of the guide groove 304 under the pushing of the second cylinder 302.

Further, the path of the guide slot 304 includes three sections, respectively: a vertical section at the upper end, a curved transition section at the middle, a horizontal section at the lower end. Namely: one end of the guide groove 304 is horizontally and longitudinally bent, and the other end is upwards and vertically bent.

Further, the movable joint 303 includes a plurality of cross bars 303a parallel to each other, and a connecting piece 303b connecting the respective cross bars 303 a. The connecting pieces 303b have connecting holes at both ends, and are movably connected with the adjacent cross bars 303a, respectively, and can relatively rotate. Preferably, the cross bar 303a is in a round bar shape, the middle position of the cross bar 303a is provided with a reducing area 303a-1, and the outer diameter of the reducing area 303a-1 is smaller than the outer diameter of the main body at two sides of the cross bar 303 a. The end of the connecting piece 303b is movably connected to the diameter-changing region 303 a-1.

Further, a collar 302a is fixed to the lower end of the piston rod of the second cylinder 302, and the collar 302a is sleeved on the diameter-variable region 303a-1 of the uppermost one of the crossbars 303a and can rotate relatively. Both ends of the cross bar 303a are respectively embedded in the corresponding guide grooves 304, and can slide in the guide grooves 304.

Preferably, a plurality of cross bars 303a may be arranged in parallel, and each cross bar 303a may adaptively slide in the guide groove 304 synchronously when the second cylinder 302 is started, so as to form different structural configurations. Preferably, when the second cylinder 302 is retracted to the shortest, all the crossbars 303a can be pulled into the vertical section at the upper end, and are in a suspended state; when the second cylinder 302 is gradually extended, each cross rod 303a can be pushed to move, and the cross rod 303a at the tail end can sequentially perform a series of actions such as sliding downwards, turning, horizontal movement and the like, and finally, the material to be sheared (or the sheared small material) at the same horizontal position is pushed to realize a feeding (or discharging) process.

The invention sets that: the guide groove 304 has an upper end (vertical section) located directly above the receiving platform 202f and a lower end (horizontal section) bent to extend across the receiving platform 202f to an upper portion of the lower blade 202c (located on both sides of the lower blade 202 c). When the metal laths to be sheared are sequentially placed on the material receiving platform 202f, the cross rod 303a at the lowest end can push one metal lath to the middle position of the top of the lower blade 202c in a clockwise manner when sliding downwards to a bending position, and then return is performed; when the metal lath is cut into small cubes, a part of the small cubes located at the top of the lower blade 202c slides down again due to the depth pushing (horizontal movement distance is longer) of the cross bar 303a, so that discharging is realized.

The gantry shearing machine further comprises a removing mechanism 500 which is transversely fixed in the frame of the gantry 100 and is inserted between the upper cutter body 201 and the lower cutter body 202, so that the situation that materials are blocked or entrained in the cutting process of the shearing mechanism 200 can be avoided.

Specifically, the rejecting mechanism 500 includes a cross beam 501 with two ends fixed to the support columns 102 at two sides, the cross beam 501 has a pair of parallel to each other, and a rejecting tooth 502 is disposed between the two cross beams 501 at intervals. The pair of parallel cross beams 501 are an inner cross beam 501a and an outer cross beam 501b, the inner cross beam 501a and the outer cross beam 501b are respectively provided with a first perforation 501a-1 and a second perforation 501b-1 which are opposite to each other and are in one-to-one correspondence, and each tooth picking 502 is respectively inserted and fixed in a corresponding group of the first perforation 501a-1 and the second perforation 501 b-1.

Further, both ends of the inner beam 501a and the outer beam 501b are respectively fixed with fixing plates fixed to the inner side surfaces of the support columns 102 by bolts.

Further, the tooth picking 502 body is in a cylindrical structure, the outer diameter of the tooth picking 502 body is matched with the inner diameters of the first perforation 501a-1 and the second perforation 501b-1, two ends of the tooth picking 502 are respectively provided with an inner end 502a and an outer end 502b, a limit head 502a-1 with a larger outer diameter is fixed on the inner end 502a, the limit head 502a-1 is blocked outside the first perforation 501a-1, and meanwhile, the outer end 502b penetrates out of the second perforation 501 b-1.

Further, the rejecting mechanism 500 further includes a strip-shaped pressing plate 503, and a lateral slot 502b-1 is formed on an outer side surface of the outer end 502b of each rejecting tooth 502, and a width of the slot 502b-1 is matched with a thickness of the pressing plate 503. When each pick 502 is inserted into the corresponding first perforation 501a-1 and second perforation 501b-1 such that the spacing head 502a-1 forms a spacing, the inside edge of the slot 502b-1 is just flush with the outside of the second perforation 501b-1, and the pressure plate 503 can be inserted into the slot 502b-1 of each pick 502 to form a spacing for that end.

Preferably, the pressure plate 503 is connected to the outer cross member 501b by bolts 504. The pressing plate 503 has a corresponding third through hole 503a, and the outer cross member 501b has a corresponding screw hole 501b-2. The bolt 504 is inserted into the third through hole 503a and is coupled to the screw hole 501b-2.

Further, the rejecting mechanism 500 is located at the upper portion of the lower blade 202c and the lower portion of the upper blade holder 201 a. The pick 502 corresponds to the spacing between each adjacent upper blade 201c, and each upper blade 201c is capable of being interspersed in the corresponding pick 502 spacing.

When the upper blade 201c moves downward and the staggered lower blades 202c cut the metal lath, the upper blade 201c can uniformly pass through each corresponding tooth picking 502 interval and be inserted into each corresponding lower blade 202c interval, at this time, the upper blade 201c is located below the tooth picking 502, and the intervals of the upper blade 201c may be blocked, and a material blocking phenomenon (caused by friction force) exists. If the upper cutter body 201 integrally returns to move upwards, the pick 502 positioned at the upper part can remove entrained square blocks along the belt, so that no material is always left between the upper cutter 201c and the lower cutter 202c after one action is finished.

It is important to note that the construction and arrangement of the application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present application. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present applications. Therefore, the application is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. A gantry clipping machine, characterized in that: comprising the steps of (a) a step of,

The portal frame (100) comprises a top plate (101) and supporting columns (102) vertically fixed at two ends of the top plate (101) to form an inner frame;

The shearing mechanism (200) comprises an upper cutter body (201) and a lower cutter body (202) which can move oppositely, the lower cutter body (202) is fixed at the bottom of the portal frame (100), the upper cutter body (201) is fixed below the top plate (101) through a first oil cylinder (203), and the upper cutter body can move linearly in the vertical direction relative to the lower cutter body (202) through vertical driving of the first oil cylinder (203);

the pushing mechanism (300) is arranged at the rear side of the portal frame (100) and can push materials positioned at the top of the lower cutter body (202); and

A feed box (400) arranged at the front side of the portal frame (100) and positioned at the lower part of the lower cutter body (202), wherein the material from the shearing mechanism (200) can fall into the feed box (400);

The upper cutter body (201) comprises an upper cutter seat (201 a), first struts (201 b) transversely arranged at the bottom of the upper cutter seat (201 a), upper blades (201 c) fixed at the lower ends of the struts (201 b), and guide plates (201 d) fixed at two transverse sides of the upper cutter seat (201 a);

The lower cutter body (202) comprises a lower cutter holder (202 a), second support columns (202 b) fixed on the upper part of the lower cutter holder (202 a) and staggered with the first support columns (201 b), and lower blades (202 c) fixed on the upper ends of the second support columns (202 b);

the thickness of the upper blade (201 c) is greater than that of the first strut (201 b), and the thickness of the lower blade (202 c) is greater than that of the second strut (202 b);

A slope plate (202 d) is fixed in the interval between the second support columns (202 b), a discharge hopper (202 e) is arranged on the outer side of the slope plate (202 d), the discharge hopper (202 e) is inclined downwards, and the lower end of the discharge hopper is positioned right above the feed box (400);

vertical guide rails (102 a) corresponding to the guide plates (201 d) are symmetrically arranged on the inner side surfaces of the supporting columns (102), and the guide plates (201 d) on two sides of the upper cutter body (201) are respectively embedded into the corresponding vertical guide rails (102 a) and can vertically slide relatively;

The removing mechanism (500), the removing mechanism (500) is located on the upper portion of the lower blade (202 c), the removing mechanism comprises a cross beam (501) with two ends fixed on two side supporting columns (102) respectively, the cross beam (501) is provided with a pair of parallel cross beams, pick teeth (502) corresponding to the intervals of the upper blades (201 c) are arranged between the two cross beams (501), and the upper blades (201 c) can be inserted into the corresponding pick teeth (502) intervals.

2. The gantry clipping machine of claim 1, wherein: the pushing mechanism (300) comprises a mounting seat (301) fixed on the rear side of the top plate (101), a second oil cylinder (302) hinged with the mounting seat (301) and with a piston rod downward, a movable joint (303) connected to the lower end of the piston rod of the second oil cylinder (302), and guide grooves (304) symmetrically arranged on two sides of the movable joint (303);

The movable joint (303) can slide along a preset track of the guide groove (304) under the pushing of the second oil cylinder (302).

3. The gantry clipping machine of claim 2, wherein: one end of the guide groove (304) is positioned at the upper part of the lower blade (202 c) and is horizontal and longitudinal, and the other end of the guide groove is bent and faces upwards and is vertical.

4. A gantry clipping machine as claimed in claim 3, wherein: the movable joint (303) comprises cross bars (303 a) parallel to each other and connecting pieces (303 b) connecting the cross bars (303 a);

The middle position of the cross rod (303 a) is provided with a reducing area (303 a-1), and the end part of the connecting sheet (303 b) is movably connected with the reducing area (303 a-1).

5. The gantry clipping machine of claim 4, wherein: a collar (302 a) is fixed at the lower end of a piston rod of the second oil cylinder (302), and the collar (302 a) is sleeved on a reducing area (303 a-1) of the uppermost cross rod (303 a);

Both ends of the cross rod (303 a) are respectively embedded into corresponding guide grooves (304).