CN210995835U

CN210995835U - Automatic copper pipe stretching device

Info

Publication number: CN210995835U
Application number: CN201921817566.8U
Authority: CN
Inventors: 宫建
Original assignee: Zhejiang Hongze Automation Equipment Co ltd
Current assignee: Zhejiang Hongze Automation Equipment Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-07-14
Anticipated expiration: 2029-10-25

Abstract

The utility model discloses an automatic copper pipe stretching device, which comprises a frame and a numerical control system for controlling a feeding mechanism, a sizing mechanism, a grabbing mechanism, a pipe drawing forming mechanism and a saw head mechanism to carry out automatic operation, wherein the feeding mechanism is used for feeding copper pipes so that the copper pipes fall on the sizing mechanism; the material fixing mechanism is used for positioning and adjusting the copper pipe; the grabbing mechanism is used for grabbing copper pipes on the material fixing mechanism, the pipe drawing forming mechanism and the saw head mechanism; the tube drawing forming mechanism is provided with a positioning die and a stretching die for positioning the end part of the copper tube and stretching the copper tube, and is also provided with an ejector rod for ejecting the copper tube after stretching forming from the positioning die and a tube pushing device for pushing the copper tube to be processed into the positioning die; the saw head mechanism is provided with a clamping device for clamping the copper pipe, a saw head assembly for cutting off the redundant part of the copper pipe and a sliding device for moving the saw head assembly. The advantages are that: the utility model discloses can improve work efficiency and reduce the cost of labor.

Description

Automatic copper pipe stretching device

Technical Field

The utility model belongs to the technical field of stretching device, especially, relate to an automatic change copper pipe stretching device.

Background

At present, the copper pipe is widely applied to occasions such as tap water pipelines, heat supply pipelines, refrigeration pipelines and the like due to the firmness and corrosion resistance of the copper pipe; in order to adapt to different use occasions, operations such as stretching, flaring and the like need to be carried out on the copper pipe; the existing copper pipe is mostly stretched through a stretching die, but the feeding, blanking and the smooth cutting of the port are mostly operated manually, so that the processing efficiency is low, and the labor cost is high.

Disclosure of Invention

The utility model aims at the not enough of above-mentioned prior art existence, provide an automatic change copper pipe stretching device, it has the characteristics that can improve machining efficiency and reduce the cost of labor.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is: the utility model provides an automatic change copper pipe stretching device which characterized in that: comprises a frame and a numerical control system for controlling the automatic operation of a feeding mechanism, a material fixing mechanism, a grabbing mechanism, a pipe drawing and forming mechanism and a saw head mechanism,

the feeding mechanism is provided with a storage hopper for containing a copper pipe and an ejector plate for ejecting the copper pipe, and the feeding mechanism is also provided with a material blocking device for blocking the copper pipe ejected from the ejector plate; the material blocking device is matched with the material fixing mechanism through the material discharging plate;

the material fixing mechanism is provided with a positioning block for positioning the copper pipe, a pushing cylinder for adjusting the relative position of the copper pipe and a positioning seat, the positioning seat is internally provided with an inductive switch for sensing the end position of the copper pipe, and the inductive switch is matched with the pushing cylinder; the two material fixing mechanisms are respectively used for positioning the copper pipe before forming and the copper pipe after forming;

the gripping mechanism is provided with a mechanical gripper for gripping the copper pipe on the material fixing mechanism, the pipe drawing forming mechanism and the saw head mechanism;

the tube drawing forming mechanism is provided with a positioning die for positioning the end part of the copper tube and a drawing die for drawing the copper tube, and the drawing die is controlled to move by a tube drawing oil cylinder; the tube drawing forming mechanism is also provided with an ejector rod for ejecting the copper tube subjected to stretch forming from the positioning die and a tube pushing device for pushing the copper tube to be processed into the positioning die;

the saw head mechanism is provided with a clamping device for clamping the copper pipe, a saw head assembly for cutting off the redundant part of the copper pipe and a sliding device for moving the saw head assembly.

The feeding mechanism comprises a storage hopper, an ejector plate, an ejector cylinder, a material blocking device and a blanking plate, wherein the storage hopper is fixed on the frame, and the bottom surface of the storage hopper is a downward inclined surface and used for automatic blanking; the ejector plate is connected with the ejector cylinder and matched with the outlet pipe orifice of the storage hopper; the material blocking device is composed of a material blocking plate and a material blocking cylinder, the material blocking cylinder is connected with the material blocking plate and controls the material blocking plate to lift, the material blocking plate and a fixing plate on the rack form a copper pipe positioning interval, one end of the material blocking plate is communicated with the copper pipe positioning interval, and the other end of the material blocking plate is communicated with the material fixing mechanism.

The copper tube positioning opening on the sizing mechanism for positioning the copper tube before molding is positioned below the outlet of the blanking plate; the positioning seat is opposite to the pushing cylinder, and the induction switch is located on the positioning seat.

The pipe drawing forming mechanism comprises a pipe drawing oil cylinder, a fixed seat, a positioning die, a drawing die seat, an ejector rod, a positioning air cylinder, an ejector rod air cylinder, a pull rod, a V-shaped positioning block and a pipe pushing device, wherein the positioning air cylinder is connected with the positioning die and controls the positioning die to open and close; the drawing die is fixed in a drawing die seat, and the drawing die seat is connected with a pipe drawing oil cylinder and is controlled to move by the pipe drawing oil cylinder; one end of the pull rod is fixedly connected with the drawing die seat through the connecting seat, and the other end of the pull rod is movably inserted and sleeved in the fixed seat; the V-shaped positioning block is fixedly arranged on the pull rod and moves along with the pull rod, and the position of the V-shaped positioning block is opposite to that of the stretching die; one end of the ejector rod is connected with the ejector rod cylinder, and the other end of the ejector rod is matched with the positioning die in use; the pipe pushing device comprises a pipe pushing cylinder, a material pushing plate and a material pushing seat, wherein the material pushing plate is fixed on the material pushing seat, and the material pushing seat is connected with the pipe pushing cylinder and is controlled to move by the pipe pushing cylinder; the material pushing plate is opposite to the positioning die.

The saw head mechanism comprises a saw head assembly, a clamping device and a sliding device, the clamping device comprises a clamping cylinder, a clamping mold and a clamping seat, and the clamping mold is arranged on the clamping seat, connected with the clamping cylinder and controlled to open and close by the clamping cylinder; the saw head assembly comprises a saw head and a driving motor, the saw head is connected with the driving motor and is controlled by the driving motor to rotate, and the saw head is matched with the clamping die in use; the sliding device comprises a longitudinal sliding block, a longitudinal guide rail, a longitudinal pushing cylinder, a transverse sliding block, a transverse guide rail, a transverse pushing cylinder, a transverse sliding plate and a longitudinal sliding plate, the driving motor is fixed on the transverse sliding plate, and the transverse sliding plate is connected with the transverse pushing cylinder and arranged on the transverse guide rail in a sliding mode through the transverse sliding block; the transverse guide rail is fixed on the longitudinal sliding plate, and the longitudinal sliding plate is connected with the longitudinal pushing cylinder and arranged on the longitudinal guide rail in a sliding mode through the longitudinal sliding block; the longitudinal guide rail is fixed on the frame.

After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the utility model discloses a feed mechanism carries out automatic continuous feeding, snatchs and the blowing automatically through snatching the mechanism, and rethread trombone slide forming mechanism carries out the shaping, is more than the part through the excision of saw head after the shaping, and this kind of automatic structure can improve machining efficiency and reduce the cost of labor greatly.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the material fixing mechanism of the present invention.

Fig. 3 is a schematic structural view of the tube drawing forming mechanism of the present invention.

Fig. 4 is a schematic structural view of the saw head mechanism of the present invention.

Fig. 5 is a schematic diagram of the structure of the copper tube to be stretched.

Detailed Description

The following description is only for the preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereby, the present invention will be further explained with reference to the drawings and the embodiments.

Examples, see fig. 1-5: an automatic copper pipe stretching device comprises a rack 10, a numerical control system 11 for controlling a feeding mechanism, a material fixing mechanism, a grabbing mechanism, a pipe drawing forming mechanism and a saw head mechanism to perform automatic operation, wherein power output devices such as a distribution box, a valve control box, a pneumatic system and a hydraulic station are arranged in the rack 10, and the power output devices can respectively provide power for the mechanisms. Various operation commands are integrated in the numerical control system 11, and the operation commands can control the above-mentioned various mechanisms to perform corresponding operations.

The feeding mechanism comprises a storage hopper 20, an ejector plate 21, an ejector cylinder 23, a material blocking device and a discharging plate 22, wherein the storage hopper 20 is fixed on the frame 10, and the bottom surface of the storage hopper is a downward inclined surface for automatic discharging; the storage hopper 20 is provided with a spacing adjusting device, the spacing adjusting device can correspondingly adjust and position two ends of a copper pipe according to different lengths of the copper pipe, and the specific structure of the spacing adjusting device is as follows: the copper tube storage device comprises two guide rods 26, two partition plates 27, a shaft sleeve 28 and a lock rod 29, wherein the two guide rods 26 are respectively fixed on the storage hopper 20 in parallel, the two partition plates 27 are also arranged oppositely, and a copper tube storage area is formed by the two partition plates and the bottom surface of the storage hopper 20 in use; the shaft sleeve 28 is inserted on the guide rod 26 and can slide on the guide rod, and the partition plate 27 is provided with a through hole which is inserted on the outer peripheral surface of the shaft sleeve 28 and is in interference fit with the shaft sleeve, namely when the shaft sleeve 28 slides, the partition plate 27 moves along with the shaft sleeve; the shaft sleeve has a screw hole in its peripheral surface communicating with its inner through hole, and the lock rod 29 is screwed into the screw hole and its end surface abuts against the peripheral surface of the guide rod 26 in use, so that after the partition plate 27 is adjusted to a proper position, the end surface of the lock rod 29 abuts against the peripheral surface of the guide rod 26 to perform a locking function. The ejector plate 21 is connected with the ejector cylinder 23, and is matched with the outlet pipe orifice of the storage hopper 20, when the copper pipe is positioned on the outlet pipe orifice, the ejector plate 21 can eject the copper pipe onto the material blocking device. The material blocking device is composed of a material blocking plate 24 and a material blocking cylinder 25, the material blocking cylinder 25 is connected with the material blocking plate 24 and controls the material blocking plate to lift, the material blocking plate 24 and a fixing plate 12 on the frame 10 form a copper pipe positioning section, one end of a blanking plate 22 is communicated with the copper pipe positioning section, and the other end of the blanking plate is communicated with a material fixing mechanism; the copper pipe that pushes up on flitch 21 will stop in copper pipe location interval earlier, and it just slides to the deciding material mechanism from blanking plate 22 after striker plate 24 shifts up.

The two material fixing mechanisms are respectively used for positioning the copper pipe before forming and the copper pipe after forming; the copper tube positioning mechanism comprises a pushing cylinder 31, two positioning blocks 30, a positioning seat 32, a fixing frame 33 and an inductive switch, wherein the pushing cylinder 31 is fixed on a rack 10, the two positioning blocks 30 are respectively arranged on the fixing frame 33 in a sliding manner and are provided with copper tube positioning holes, the copper tube positioning holes on the copper tube positioning mechanism before positioning and molding are positioned below the outlet of a blanking plate 22, and therefore, when the copper tube slides out of the blanking plate 22, the copper tube directly falls on the copper tube positioning holes; the copper pipe after being formed is directly placed after being grabbed by the mechanical grabbing hand 40. The positioning seat 32 is opposite to the pushing cylinder 31, and the inductive switch is positioned on the positioning seat 32; in use, after the copper pipe falls onto the positioning block 30, the cylinder rod on the pushing cylinder 31 can push the end of the copper pipe to move on the positioning block 30, after the other end of the copper pipe is contacted with the inductive switch, the inductive switch can send a signal to stop pushing the pushing cylinder 31, the copper pipe is located at a material fixing position at the moment, and the mechanical gripper 40 can grab the copper pipe and place the copper pipe onto the pipe drawing forming mechanism.

The pipe drawing forming mechanism comprises a pipe drawing oil cylinder 52, a fixed seat 54, a positioning die 50, a drawing die 51, a drawing die seat 55, an ejector rod 53, a positioning air cylinder 56, an ejector rod air cylinder 57, a pull rod 58, a V-shaped positioning block 59 and a pipe pushing device, wherein the positioning die 50 is divided into an upper die 501 and a lower die 502, the lower die 502 is positioned on the rack 10, the upper die 501 is connected with the positioning air cylinder 56 and controls the opening and closing of the upper die 501 and the positioning air cylinder 56, and semicircular clamping grooves are respectively arranged on the upper die 501 and the lower die 502 so as to clamp and position the end part of a copper. The drawing die 51 is fixed in a drawing die seat 55, and the drawing die seat 55 is connected with the tube drawing oil cylinder 52 and is controlled to move by the tube drawing oil cylinder; the drawing die 51 has a tube inlet width larger than a tube outlet width so as to facilitate the insertion of the end part of the copper tube; during stretching, the tube drawing cylinder 52 drives the stretching die base 55 to move backwards, and the stretching die 51 stretches the copper tube by retreating. One end of the pull rod 58 is fixedly connected with the stretching die seat 55 through the connecting seat 581, and the other end of the pull rod is movably inserted in the fixing seat 54, so that the positioning effect can be achieved, and the shaking phenomenon is prevented; a V-shaped positioning block 59 is fixedly arranged on the pull rod 58 and moves along with the pull rod, and the position of the V-shaped positioning block is opposite to that of the drawing die 51; the pull rod 58 can position the V-shaped positioning block 59 to prevent the concentricity from deviating during stretching. One end of the ejector 53 is connected to the ejector cylinder 57, and the other end thereof is engaged with the positioning mold 50. The pipe pushing device comprises a pipe pushing cylinder 80, a material pushing plate 81 and a material pushing seat 82, wherein the material pushing plate 81 is fixed on the material pushing seat 82, and the material pushing seat 82 is connected with the pipe pushing cylinder 80 and is controlled to move by the same; the ejector plate 81 is located opposite to the positioning die 50. When the copper pipe drawing machine works, a copper pipe to be processed is grabbed by the mechanical gripper 40 and then placed on the V-shaped positioning block 59, the pushing plate 81 pushes the positioning end of the copper pipe to penetrate through the drawing die 51 and be inserted into the positioning die 50 under the pushing action of the pipe pushing cylinder 80, the pipe drawing cylinder 52 is pulled back after being locked by the positioning cylinder 56, the drawing die 51 is used for drawing the copper pipe, the frame 10 or the pipe drawing forming mechanism is provided with the travel switch 13, the travel switch 13 is respectively positioned at a pipe drawing starting point and a pipe drawing ending point, and the drawing is stopped when the drawing die seat 55 reaches the pipe drawing ending point; after the drawing is finished, the drawing oil cylinder 52 pushes the drawing die seat 55 to return to the drawing starting point, at this time, the ejector rod 53 is pushed by the ejector rod air cylinder 57 to eject the drawn copper tube out of the drawing die 51, so that the mechanical gripper 40 grips the copper tube.

The saw head mechanism comprises a saw head assembly, a clamping device and a sliding device, the clamping device comprises a clamping cylinder 60, a clamping die 61 and a clamping seat 62, and the clamping die 61 is arranged on the clamping seat 62, connected with the clamping cylinder 60 and controlled to open and close by the clamping cylinder 60. The saw head assembly comprises a saw head 63 and a driving motor 64, the saw head 63 is connected with the driving motor 64 and is controlled by the driving motor 64 to rotate, the saw head 63 is matched with the clamping die 61 in use, namely, more than part of the copper pipe on the clamping die 61 can be cut off by the saw head 63. The sliding device comprises a longitudinal sliding block 65, a longitudinal guide rail 66, a longitudinal pushing cylinder 67, a transverse sliding block 68, a transverse guide rail 69, a transverse pushing cylinder 70, a transverse sliding plate 71 and a longitudinal sliding plate 72, a driving motor 64 is fixed on the transverse sliding plate 71, and the transverse sliding plate 71 is connected with the transverse pushing cylinder 70 and is arranged on the transverse guide rail 69 in a sliding mode through the transverse sliding block 68; the transverse guide rail 69 is fixed on a longitudinal slide plate 72, the longitudinal slide plate 72 is connected with the longitudinal pushing cylinder 67 and is arranged on the longitudinal guide rail 66 in a sliding way through a longitudinal slide block 65, and the longitudinal guide rail 66 is fixed on the machine frame 10. Before the mechanical gripper 40 puts the copper tube, the saw head 63 and the driving motor 64 are driven by the transverse sliding plate 71 and the longitudinal sliding plate 72 to move outwards, so that the copper tube is not influenced to be put into the clamping die 61; after the copper pipe is placed (the part of the copper pipe needing to be cut is exposed out of the clamping die), the clamping die 61 clamps the copper pipe, the longitudinal pushing cylinder 67 pushes the driving motor 64 to a specified position, and then the transverse pushing cylinder 70 pushes the driving motor 64 to move transversely, so that the saw head 63 cuts the copper pipe when passing through the copper pipe; after completion, the clamping die 61 is released, allowing the mechanical gripper 40 to grasp the copper tube and to collect the material. In order to improve the cutting stability, a support seat 14 is provided on the frame 10, and the support seat 14 can support the end of the copper tube to prevent the copper tube from dropping and affecting the cutting flatness.

The grabbing mechanism is used for grabbing copper tubes on the material fixing mechanism, the tube drawing forming mechanism and the saw head mechanism and comprises a mechanical gripper 40, a pneumatic finger 41, a lifting cylinder 42 and a sliding seat 43, the sliding seat 43 can be arranged on a cross beam of the rack 10 in a sliding mode under the action of a pneumatic system, the lifting cylinder 42 is fixed on the sliding seat 43 and is linked with the sliding seat 43, the pneumatic finger 41 is connected with the lifting cylinder 42 and is controlled to lift by the lifting cylinder 42, and the mechanical gripper 40 is connected with the pneumatic finger 41 and is controlled to open and close by the pneumatic finger 41; when the copper pipe is grabbed, the pneumatic finger 41 controls the mechanical gripper 40 to be opened, the lifting cylinder 42 pushes the mechanical gripper 40 downwards to reach a specified position, and then the pneumatic finger 41 controls the mechanical gripper 40 to be closed so as to grab the copper pipe; after the copper pipe is grabbed, the lifting air cylinder 42 is pulled upwards to enable the mechanical gripper 40 to move upwards, then the sliding seat 43 slides to be right above the blanking position of the next process, the lifting air cylinder 42 descends to the specified position, the pneumatic finger 41 controls the mechanical gripper 40 to be released, and the copper pipe falls to the specified position.

The stretching die 51 and the mechanical gripper 40 are widely used at present, and other structures and principles are the same as those in the prior art, and are not described in detail here.

Claims

1. The utility model provides an automatic change copper pipe stretching device which characterized in that: comprises a frame (10) and a numerical control system (11) for controlling the feeding mechanism, the material fixing mechanism, the grabbing mechanism, the pipe drawing and forming mechanism and the saw head mechanism to carry out automatic operation,

the feeding mechanism is provided with a storage hopper (20) for containing a copper pipe and an ejector plate (21) for ejecting the copper pipe, and the feeding mechanism is also provided with a material blocking device for blocking the copper pipe ejected from the ejector plate (21); the material blocking device is matched with the material fixing mechanism through a blanking plate (22);

the material fixing mechanism is provided with a positioning block (30) for positioning a copper pipe, a pushing cylinder (31) and a positioning seat (32) for adjusting the relative position of the copper pipe, an inductive switch for sensing the end position of the copper pipe is arranged in the positioning seat (32), and the inductive switch is matched with the pushing cylinder (31); the two material fixing mechanisms are respectively used for positioning the copper pipe before forming and the copper pipe after forming;

the grabbing mechanism is provided with a mechanical grabbing hand (40) for grabbing the copper pipe on the material fixing mechanism, the pipe drawing forming mechanism and the saw head mechanism;

the tube drawing forming mechanism is provided with a positioning die (50) for positioning the end part of the copper tube and a drawing die (51) for drawing the copper tube, and the drawing die (51) is controlled to move by a tube drawing oil cylinder (52); the tube drawing forming mechanism is also provided with an ejector rod (53) for ejecting the copper tube subjected to stretch forming from the positioning die (50) and a tube pushing device for pushing the copper tube to be processed into the positioning die (50);

2. An automated copper tube stretching device as claimed in claim 1, wherein: the feeding mechanism comprises a storage hopper (20), an ejector plate (21), an ejector cylinder (23), a material blocking device and a blanking plate (22), wherein the storage hopper (20) is fixed on the rack (10), and the bottom surface of the storage hopper is a downward inclined surface and used for automatic blanking; the ejector plate (21) is connected with the ejector cylinder and is matched with the outlet pipe orifice of the storage hopper (20); the material blocking device is composed of a material blocking plate (24) and a material blocking cylinder (25), the material blocking cylinder (25) is connected with the material blocking plate (24) and controls the material blocking cylinder to lift, a copper pipe positioning area is formed between the material blocking plate (24) and a fixing plate (12) on a rack (10), one end of a lower material plate (22) is communicated with the copper pipe positioning area, and the other end of the lower material plate is communicated with a material fixing mechanism.

3. An automated copper tube stretching device as claimed in claim 2, wherein: the material fixing mechanism comprises a pushing cylinder (31), a positioning block (30), a positioning seat (32), a fixing frame (33) and an induction switch, wherein the pushing cylinder (31) is fixed on the rack (10), the positioning block (30) is arranged on the fixing frame (33) in a sliding mode and is provided with a copper pipe positioning port, and the copper pipe positioning port on the material fixing mechanism for positioning and forming a copper pipe is positioned below the outlet of the blanking plate (22); the positioning seat (32) is opposite to the pushing cylinder (31), and the inductive switch is positioned on the positioning seat (32).

4. An automated copper tube stretching device as claimed in claim 3, wherein: the tube drawing forming mechanism comprises a tube drawing oil cylinder (52), a fixed seat (54), a positioning die (50), a drawing die (51), a drawing die seat (55), an ejector rod (53), a positioning cylinder (56), an ejector rod cylinder (57), a pull rod (58), a V-shaped positioning block (59) and a tube pushing device, wherein the positioning cylinder (56) is connected with the positioning die (50) and controls the opening and closing of the positioning die (50); the drawing die (51) is fixed in a drawing die seat (55), and the drawing die seat (55) is connected with a tube drawing oil cylinder (52) and is controlled to move by the tube drawing oil cylinder; one end of the pull rod (58) is fixedly connected with the stretching die seat (55) through a connecting seat (581), and the other end of the pull rod is movably inserted in the fixed seat (54); the V-shaped positioning block (59) is fixedly arranged on the pull rod (58) and moves along with the pull rod, and the position of the V-shaped positioning block is opposite to that of the drawing die (51); one end of the ejector rod (53) is connected with the ejector rod cylinder (57), and the other end of the ejector rod is matched with the positioning die (50); the pipe pushing device comprises a pipe pushing cylinder (80), a material pushing plate (81) and a material pushing seat (82), wherein the material pushing plate (81) is fixed on the material pushing seat (82), and the material pushing seat (82) is connected with the pipe pushing cylinder (80) and is controlled to move by the same; the material pushing plate (81) is opposite to the positioning die (50).

5. An automated copper tube drawing apparatus as claimed in claim 4, wherein: the saw head mechanism comprises a saw head assembly, a clamping device and a sliding device, the clamping device comprises a clamping cylinder (60), a clamping die (61) and a clamping seat (62), and the clamping die (61) is arranged on the clamping seat (62), connected with the clamping cylinder (60) and controlled to open and close by the clamping cylinder; the saw head assembly comprises a saw head (63) and a driving motor (64), the saw head (63) is connected with the driving motor (64) and is controlled by the driving motor to rotate, and the saw head (63) is matched with the clamping die (61) in use; the sliding device comprises a longitudinal sliding block (65), a longitudinal guide rail (66), a longitudinal pushing cylinder (67), a transverse sliding block (68), a transverse guide rail (69), a transverse pushing cylinder (70), a transverse sliding plate (71) and a longitudinal sliding plate (72), the driving motor (64) is fixed on the transverse sliding plate (71), and the transverse sliding plate (71) is connected with the transverse pushing cylinder (70) and arranged on the transverse guide rail (69) in a sliding mode through the transverse sliding block (68); the transverse guide rail (69) is fixed on a longitudinal sliding plate (72), and the longitudinal sliding plate (72) is connected with a longitudinal pushing cylinder (67) and is arranged on the longitudinal guide rail (66) in a sliding manner through a longitudinal sliding block (65); the longitudinal guide rail (66) is fixed on the frame (10).