An upper tube device

Abstract

The present invention provides a pipe-loading device, comprising a frame, an electric control module, a silo, a pipe-jacking assembly and a pipe-pushing assembly; the pipe-jacking assembly comprises a lifting plate and a first power unit; the first power unit is arranged on the first side plate of the frame and connected to the lifting plate, driving the lifting plate to rise and lift the pipe body provided at the silo; the pipe-pushing assembly comprises a first push block and a second power unit; a through hole is arranged on the first side plate of the frame, and the through hole is higher than the stacking height of the pipe body; the first push block is inserted in the through hole; the second power unit is transmission-connected with the first push block, driving the first push block to extend and retract in the through hole; during the lifting process of the lifting plate, when the distance between the lifting plate and the first push block is greater than the outer diameter of one pipe body and less than the sum of the outer diameters of two pipe bodies, the second power unit drives the first push block to extend and retract from the through hole. The structure of the device is compact and ingenious, which not only realizes fully automatic pipe loading, but also effectively avoids the situation of overloading, greatly improving production efficiency.

Description

Technical Field

[0001] The invention relates to the field of electric heating tube processing, and in particular to a tube mounting device. Background Art

[0002] Electric heating tubes, also known as electric heating tubes, are electrical components that can convert electrical energy into thermal energy. For example, electric water heaters, electric kettles, and heating furnaces commonly used in daily life are equipped with electric heating tubes.

[0003] Generally, the electric heating tube is composed of a metal tube, a heating wire, an insulating powder, a seal and a porcelain bead. Among them, the heating wire is arranged in the metal tube. The insulating powder is filled inside the tube body. One end of the lead rod is connected to the heating wire, and the other end passes through the seal and extends out of the metal tube. This means that the manufacture of the electric heating tube must go through multiple processing steps. Therefore, the metal tube, the semi-finished electric heating tube and the finished electric heating tube will go through multiple turnovers during the manufacturing process. In each tube loading process, it was found that the loading mechanism often provides two or more tube bodies at one time, causing the subsequent processing mechanism to be unable to process them one by one normally, seriously affecting production efficiency. Summary of the invention

[0004] One object of the present invention is to provide a top pipe device to overcome the defects of excess material feeding and low production efficiency in the related art.

[0005] The technical solution adopted by the present invention to solve its technical problem is to provide a pipe-loading device for use in electric heating pipe processing equipment, including a frame and an electric control module arranged on the frame, and also including a silo, a pipe-jacking assembly and a pipe-pushing assembly; the silo is arranged on the frame; a cavity for accommodating a plurality of pipe bodies parallel to each other is provided in the silo; the pipe-jacking assembly includes a lifting plate and a first power unit electrically connected to the electric control module; the first power unit is arranged on a first side plate of the frame and is transmission-connected to the lifting plate to drive the lifting plate to rise and lift the pipe body provided at the silo; the pipe-pushing assembly includes a first pushing block and a first power unit electrically connected to the electric control module; the first power unit is arranged on a first side plate of the frame and is transmission-connected to the lifting plate to drive the lifting plate to rise and lift the pipe body provided at the silo; the pipe-pushing assembly includes a first pushing block and a first power unit electrically connected to the electric control module a second power unit electrically connected to the control module; a through hole adapted to the shape of the first push block is opened on the first side panel of the frame, and the position of the through hole is higher than the stacking height of the tube body in the cavity; the first push block is slidably inserted in the through hole; the second power unit is arranged on the first side panel and is transmission-connected with the first push block to drive the first push block to extend and retract in the through hole; during the rising process of the lifting plate, when the distance between the lifting plate and the first push block is greater than the outer diameter of one tube body and less than the sum of the outer diameters of the two tube bodies, the second power unit drives the first push block to first extend out of the through hole and then retract.

[0006] The present invention provides a tube-laying device, which drives the lifting plate to rise by the first power unit, thereby lifting the tube body provided by the silo. During the lifting process of the lifting plate, when the distance between the lifting plate and the first push block is greater than the outer diameter of one tube body and less than the sum of the outer diameters of two tube bodies, the first push block is first extended from the through hole by the second power unit, and the other tube bodies on the tube body at the bottom of the lifting plate are pushed back into the cavity, and then the first push block is driven to retract into the through hole to avoid interfering with the continued rise of the lifting plate, and then the lifting plate rises to the tube-laying position. The structure of the device is compact and ingenious, which not only realizes fully automatic tube laying, but also effectively avoids the situation of over-loading, greatly improving production efficiency.

[0007] In some embodiments, the first power unit includes a first lifting cylinder and a second lifting cylinder; the first lifting cylinder is vertically mounted on the first side plate; the cylinder body of the second lifting cylinder is fixedly connected to the lifting plate, and the piston rod of the second lifting cylinder is fixedly connected to the piston rod of the first lifting cylinder; after the piston rod of the first lifting cylinder is extended, the lifting plate rises to a position where the distance between the first pushing block and the first pushing block is greater than the outer diameter of one tube body and less than the sum of the outer diameters of two tube bodies; the second power unit drives the first pushing block to extend first to above the tube body at the bottom end of the lifting plate, and then retracts into the through hole; then the piston rod of the second lifting cylinder is extended to drive the lifting plate to continue to rise.

[0008] In some embodiments, the push tube assembly also includes a second push block and a return spring; one end of the second push block is transmission-connected to the second power unit, and the other end is provided with a wedge-shaped body that is narrow at the top and wide at the bottom; the end of the first push block close to the second push block is provided with a wedge-shaped hole that cooperates with the wedge-shaped body, and the other end is inserted into the through hole; the return spring is compressed between the first push block and the first side plate, thereby driving the first push block to retract into the through hole.

[0009] In some embodiments, the first push block is in a "convex" shape, including a push rod inserted in the through hole and a connecting block fixed to the push rod; the wedge-shaped hole is provided in the connecting block; a receiving groove is provided at one end of the connecting block close to the first side plate; one end of the return spring is inserted in the receiving groove, and the other end is connected to the first side plate.

[0010] In some embodiments, the silo includes a bottom plate mounted on a frame and limit plates arranged on both sides of the bottom plate; the bottom plate and the limit plates on both sides form the cavity; there is a gap between the bottom plate and the lifting plate, and one end of the bottom plate close to the lifting plate is lower than the other end away from the lifting plate.

[0011] In some embodiments, the base plate includes a rotating plate and a plurality of support rods inserted in the rotating plate in parallel and at intervals; both ends of the rotating plate are rotatably connected to the frame.

[0012] In some embodiments, the silo includes a locking screw and an adjustment plate for adjusting the distance between two limit plates; the adjustment plate is provided with a slide groove along its length; one end of the limit plate is fixedly connected to the adjustment plate; the locking screw passes through the slide groove and is threadedly connected to the frame.

[0013] In some embodiments, the upper tube device also includes a conveying track, a conveying belt, a conveying motor and a pushing cylinder; the conveying track is parallel to the lifting plate, and a notch is provided on the conveying track corresponding to the position of the cavity; the conveying belt is arranged in the conveying track; the conveying motor is installed on the conveying track and is transmission-connected to the conveying belt to drive the conveying belt to rotate; the pushing cylinder is installed on one side of the notch, so as to push the tube body on the conveying belt into the cavity.

[0014] In some embodiments, one end of the top surface of the lifting plate close to the first side plate is lower than the other end away from the first side plate, thereby forming a V-shaped groove with the first side plate; the upper tube device also includes a guide plate fixed on the first side plate for guiding the tube body to the next workstation; the guide plate is provided with an inclined surface; after the lifting plate rises, the inclined surface of the guide plate can be connected with the top surface of the lifting plate.

[0015] In some embodiments, the upper tube device further comprises a centering cylinder symmetrically arranged on both sides of the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the upper tube device according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the three-dimensional structure of the upper tube device of an embodiment of the present invention from another angle;

[0019] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure at the AA position;

[0020] Figure 4 is a schematic diagram of the working state of the lifting plate of the embodiment of the present invention after the first lifting;

[0021] Figure 5 Schematic diagram of the working state of the lifting plate after the second lifting of the embodiment of the present invention;

[0022] Figure 6 yes Figure 4 A partial enlarged schematic diagram of position B in the middle;

[0023] Figure 7 is a schematic diagram of the three-dimensional structure of the first push block according to an embodiment of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the second push block according to an embodiment of the present invention.

[0025] The following are the descriptions of the reference numerals:

[0026] 100-tube body;

[0027] 1-frame; 11-first side panel; 12-second side panel; 13-third side panel; 14-fourth side panel;

[0028] 2-bin; 21-bottom plate; 22-rotating plate; 23-support rod; 24-limiting plate; 25-adjusting plate;

[0029] 3-jacking pipe assembly; 31-lifting plate; 32-first power unit; 33-first jacking cylinder; 34-second jacking cylinder; 35-guide shaft; 36-mounting seat;

[0030] 4-push tube assembly; 41-first push block; 42-wedge-shaped hole; 43-push rod; 44-connecting block; 45-accommodating groove; 46-second power unit; 47-second push block; 48-wedge-shaped body;

[0031] 51-transmission track; 52-conveyor belt; 53-transmission motor; 54-push cylinder;

[0032] 6-guide plate; 7-centering cylinder; 8-support seat. DETAILED DESCRIPTION

[0033] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0034] like Figures 1 to 5 As shown, this embodiment provides a pipe loading device for use in electric heating pipe processing equipment, which includes a frame 1 and an electric control module arranged on the frame 1, and also includes a silo 2, a pipe jacking assembly 3 and a pipe pushing assembly 4. In the embodiment, the pipe body 100 is a cylindrical structure. In other embodiments, the pipe body 100 may also be a prismatic structure.

[0035] The frame 1 of this embodiment is in a rectangular parallelepiped shape, including a first side plate 11, a second side plate 12 and a third side plate 13 fixed to both ends of the first side plate 11, and a fourth side plate 14 located opposite to the first side plate 11. However, it can be understood that the shape and structure of the frame 1 can be appropriately adjusted according to actual production needs.

[0036] The silo 2 is disposed on the frame 1 , and a cavity capable of accommodating a plurality of tubes 100 parallel to each other is provided in the silo 2 .

[0037] The jacking assembly 3 includes a lifting plate 31 and a first power unit 32 electrically connected to the electric control module. The first power unit 32 is arranged on the first side plate 11 of the frame 1 and is in transmission connection with the lifting plate 31 to drive the lifting plate 31 to rise and lift the pipe body 100 provided at the silo 2.

[0038] The push tube assembly 4 includes a first push block 41 and a second power unit 46 electrically connected to the electronic control module. A through hole adapted to the shape of the first push block 41 is provided on the first side plate 11 of the frame 1, and the position of the through hole is higher than the stacking height of the tube body 100 in the cavity. The first push block 41 is slidably inserted in the through hole. The second power unit 46 is arranged on the first side plate 11 and is transmission-connected to the first push block 41 to drive the first push block 41 to extend and retract in the through hole.

[0039] The first power unit 32 drives the lifting plate 31 to rise, thereby lifting the tube body 100 provided by the silo 2. Figure 6 During the lifting process of the lifting plate 31, when the distance h between the lifting plate 31 and the first push block 41 is greater than the outer diameter d of one tube body and less than the sum of the outer diameters of the two tube bodies 2d (i.e., d<h<2d), the first push block 41 is firstly extended from the through hole by the second power unit 46, and the other tube bodies 100 on the tube body 100 at the bottom of the lifting plate 31 are pushed back into the cavity, and then the first push block 41 is driven to retract into the through hole to avoid interfering with the continued lifting of the lifting plate 31, and then the lifting plate 31 rises to the tube loading position. The structure of the device is compact and ingenious, which not only realizes full-automatic tube loading, but also effectively avoids the situation of overloading, greatly improving production efficiency.

[0040] Continue to refer Figure 1 , Figure 2 The silo 2 includes a bottom plate 21 mounted on the frame 1 and limit plates 24 arranged on both sides of the bottom plate 21. The bottom plate 21 and the limit plates 24 on both sides form the above-mentioned cavity. One end of the bottom plate 21 close to the lifting plate 31 is lower than the other end away from the lifting plate 31. There is a gap between the bottom plate 21 and the lifting plate 31, and the lower end of the bottom plate 21 is slightly higher than the top surface of the lifting plate 31 at the lowest position, that is, the bottom plate 21 is an inclined surface. In this way, the tube body 100 will automatically roll down to the bottom of the silo 2, that is, above the lifting plate 31, under the action of gravity, without the use of additional power-consuming power structures, which is energy-saving and environmentally friendly.

[0041] The bottom plate 21 includes a rotating plate 22 and support rods 23 inserted in parallel and at intervals in the rotating plate 22. Both ends of the rotating plate 22 are rotatably connected to the second side plate 12 and the third side plate 13 of the frame 1. By rotating the rotating plate 22, the inclination of the bottom plate 21 can be adjusted, thereby adjusting the height position of the bottom of the silo 2.

[0042] In order to be compatible with tube bodies 100 of different lengths, the silo 2 also includes a locking screw (not shown) and an adjustment plate 25. The adjustment plate 25 is provided with a slide groove along its length. One end of the above-mentioned limit plate 24 is fixedly connected to one end of the adjustment plate 25, and the other end is bent outward and abuts against the rotating plate 22, so that the feed port of the silo 2 becomes funnel-shaped, which has a guiding and centralizing effect. The locking screw is threadedly connected to the frame 1 after passing through the slide groove. According to the length of the tube body 100, the distance between the two limit plates 24 can be adjusted by sliding the adjustment plate 25 left and right. After the adjustment is completed, the position of the adjustment plate 25 can be fixed by the locking screw, which is very convenient.

[0043] Still reference Figure 1 The upper tube device also includes a conveying track 51, a conveying belt 52, a driving wheel (not shown), a driven wheel, a conveying motor 53 and a pushing cylinder 54. Among them, the conveying track 51 is used to connect the equipment in the previous process with the silo 2 in this device. The conveying track 51 is parallel to the lifting plate 31, and a notch is provided at the position of the conveying track 51 corresponding to the silo 2 cavity. The conveying belt 52 is embedded in the conveying track 51. The conveying motor 53 is installed on the conveying track 51, and is connected to the conveying belt 52 through the driving wheel and the driven wheel, so as to drive the conveying belt 52 to rotate. The pushing cylinder 54 is installed on one side of the notch, so as to push the tube body 100 on the conveying belt 52 into the cavity. Since the conveying track 51 and the conveying belt 52 are parallel to the lifting plate 31, when the pushing cylinder 54 pushes the tube body 100 into the cavity, the tube body 100 is still parallel to the lifting plate 31 after rolling to the bottom of the silo 2, and the tube bodies 100 are also parallel to each other, neat and orderly.

[0044] Continue to refer Figures 3 to 5Preferably, in order to avoid the lifting plate 31 from rising too fast and hitting the first push block 41, the lifting plate 31 in this embodiment will rise twice. Specifically, the first power unit 32 includes a first lifting cylinder 33 and a second lifting cylinder 34. Among them, the cylinder body of the first lifting cylinder 33 is vertically installed on the first side plate 11. The cylinder body of the second lifting cylinder 34 is fixedly connected to the lifting plate 31, and the piston rod of the second lifting cylinder 34 is fixedly connected to the piston rod of the first lifting cylinder 33. In this way, after the piston rod of the first lifting cylinder 33 is extended, the lifting plate 31 rises to a position where the spacing h between the lifting plate 31 and the first push block 41 is greater than the outer diameter d of one tube body and less than the sum of the outer diameters 2d of the two tube bodies. The second power unit 46 drives the first push block 41 to extend first to the top of the tube body 100 located at the bottom of the lifting plate 31, and then retracts into the through hole; then the piston rod of the second lifting cylinder is extended to drive the lifting plate 31 to continue to rise to the upper tube position.

[0045] In another embodiment, the first power unit 32 is a two-stroke cylinder (also called a multi-position cylinder). The two-stroke cylinder is vertically mounted on the first side plate 11 of the frame 1, and the piston rod of the two-stroke cylinder is fixedly connected to the lifting plate 31. In the process of the two-stroke cylinder driving the lifting plate 31 to rise, when the distance h between the lifting plate 31 and the first push block 41 is greater than the outer diameter d of one tube body and less than the sum of the outer diameters 2d of the two tube bodies, the lifting plate 31 stops, and the second power unit 46 drives the first push block 41 to extend from the through hole to the top of the tube body 100 at the bottom of the lifting plate 31, and then retracts into the through hole. Then the two-stroke cylinder drives the lifting plate 31 to continue to rise to the upper tube position.

[0046] In another embodiment, the first power unit 32 may also be a screw pair structure driven by a precision servo motor. The screw nut is fixedly connected to the lifting plate 31, and the servo motor drives the screw to rotate twice, thereby driving the lifting plate 31 to rise twice.

[0047] More preferably, in order to improve the position accuracy and stability of the lifting plate 31, the jacking pipe assembly 3 further includes a guide shaft 35 ( Figure 1 ) and a mounting seat 36. Both ends of the guide shaft 35 are mounted on the first side plate 11 through the mounting seats 36. The lifting plate 31 is slidably connected to the guide shaft 35, and the lifting plate 31 is lifted up and down along the guide shaft 35.

[0048] For reference Figures 3 to 8The push tube assembly 4 includes a first push block 41, a second power unit 46, a second push block 47 and a return spring (not shown). One end of the second push block 47 is connected to the second power unit 46 in a transmission manner, and the other end is provided with an inclined surface to form a wedge-shaped body 48 that is narrow at the top and wide at the bottom. One end of the first push block 41 close to the second push block 47 is provided with a wedge-shaped hole 42 that cooperates with the wedge-shaped body 48, and the other end is inserted into the through hole. Preferably, the second power unit 46 is a push tube cylinder, which is vertically mounted on the first side plate 11, and the piston rod of the push tube cylinder is fixedly connected to the bottom end of the second push block 47. In other embodiments, the second power unit 46 can also be an electric cylinder, a linear motor, a screw pair structure, etc. When the second power unit 46 drives the second push block 47 to rise, the first push block 41 is driven to move toward the direction of the lifting plate 31 through the cooperation of the wedge-shaped body 48 and the wedge-shaped hole 42, thereby detecting whether the lifting plate 31 contains two or more pipe bodies 100. The return spring is compressed between the first push block 41 and the first side plate 11 , thereby driving the first push block 41 to retract into the through hole after extending out.

[0049] Continue to refer Figure 7 The first push block 41 is in a "convex" shape, and includes a push rod 43 inserted in the through hole and a connecting block 44 fixedly connected to the push rod 43. The wedge-shaped hole 42 is provided in the connecting block 44. An end of the connecting block 44 close to the first side plate 11 is provided with a receiving groove 45. One end of the reset spring is inserted in the receiving groove 45, and the other end is connected to the first side plate 11. In this way, not only the position of the reset spring can be limited, but also the length of the push rod 43 that can be extended out of the through hole can be limited.

[0050] Continue to refer Figure 5 , Figure 6 In order to allow the tube body 100 to remain stably on the top surface of the lifting plate 31, the top surface of the lifting plate 31 is designed to be an inclined surface, and the end of the top surface close to the first side plate 11 is lower than the other end away from the first side plate 11, thereby forming a V-shaped groove with the first side plate 11, which can effectively prevent the tube body 100 from falling off the lifting plate 31 during the rising process. The upper tube device also includes a guide plate 6 fixed on the first side plate 11 to facilitate guiding the tube body 100 to the next station, and the upper surface (in the direction shown in the figure) of the guide plate 6 is an inclined surface. The guide plate 6 is installed at the top end of the first side plate 11, and an avoidance hole is opened on the guide plate 6 at the position corresponding to the second push block 47. In this way, the second push block 47 will not collide with the guide plate 6 when rising. After the lifting plate 31 rises, the inclined surface of the guide plate 6 can be connected with the top surface of the lifting plate 31. In this way, when the lifting plate 31 lifts the tube body 100 to the upper tube position, the tube body 100 will automatically roll down into the next station along the top surface of the lifting plate 31 and the inclined surface of the guide plate 6 under the action of gravity, without the need to use additional power-consuming structures.

[0051] Reference again Figure 1 , Figure 2 The upper tube device also includes a centering cylinder 7 symmetrically arranged on both sides of the guide plate 6. When the piston rods of the two opposite centering cylinders 7 are extended, the tube body 100100 can be pushed back to the center position.

[0052] Based on the above structural description of the upper tube device, the working mode of the device is described in detail below in conjunction with the accompanying drawings:

[0053] refer to Figure 1 , the equipment in the previous station (not shown) sends the tube body 100 to the conveyor belt 52 in the conveyor track 51, and the conveyor motor 53 drives the conveyor belt 52 to rotate, and transports the tube body 100 to the notch position of the conveyor track 51. Then the piston rod of the push cylinder 54 extends to push the tube body 100 into the cavity of the silo 2. After the tube body 100 enters the silo 2, it rolls down to the bottom of the silo 2 along the bottom plate 21.

[0054] refer to Figure 4 , the piston rod of the first lifting cylinder 33 extends, driving the second lifting cylinder 34 and the lifting plate 31 to rise. During the rising process of the lifting plate 31, the top of the lifting plate 31 lifts the tube body 100 in the silo 2, and the tube body 100 is fixed in the V-shaped groove formed by the top surface of the lifting plate 31 and the first side plate 11. When the lifting plate 31 rises to a position where the distance between it and the first push block 41 is greater than the outer diameter of one tube body 100 and less than the sum of the outer diameters of two tube bodies 100, the piston rod of the first lifting cylinder 33 and the lifting plate 31 stop.

[0055] The piston rod of the push tube cylinder extends, driving the second push block 47 to rise, and through the cooperation between the wedge body 48 and the wedge hole 42, driving the push rod 43 in the first push block 41 to extend out of the through hole, pushing the other tube bodies 100 on the bottom tube body 100 on the lifting plate 31 back into the cavity. Then the piston rod of the push tube cylinder retracts, and the return spring drives the push rod 43 back into the through hole by elastic force.

[0056] refer to Figure 5 , the piston rod of the second lifting cylinder 34 extends, driving the cylinder body of the second lifting cylinder 34 and the lifting plate 31 to continue to rise to the upper tube position. At this time, the top surface of the lifting plate 31 is connected with the upper surface of the guide plate 6, and the tube body 100 rolls down along the inclined surface to the support seat 8 of the next station. The piston rods of the centering cylinders 7 symmetrically arranged on both sides of the guide plate 6 extend to push the tube body 100 to the center position, which is convenient for subsequent processing operations.

[0057] Although the present invention has been described with reference to the above typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the claims or their equivalents should be covered by the appended claims.

Claims

1. A tube loading device, used in electric heating tube processing equipment, comprising a frame and an electric control module arranged on the frame, characterized in that: Also includes: A silo is arranged on the frame; the silo is provided with a cavity capable of accommodating a plurality of mutually parallel tubes; The jacking pipe assembly includes a lifting plate and a first power unit electrically connected to the electric control module; the first power unit is arranged The first side plate of the frame is connected to the lifting plate in a transmission manner, driving the lifting plate to rise and lift the pipe body provided at the silo; The push tube assembly comprises a first push block and a second power unit electrically connected to the electric control module; a through hole adapted to the shape of the first push block is provided on the first side plate of the frame, and the position of the through hole is higher than the stacking height of the tube bodies in the cavity; the first push block is slidably inserted in the through hole; the second power unit is arranged on the first side plate and is transmission-connected with the first push block to drive the first push block to extend and retract in the through hole; During the lifting process of the lifting plate, when the distance between the lifting plate and the first push block is greater than the outer diameter of one tube body and less than the sum of the outer diameters of the two tube bodies, the second power unit drives the first push block to first extend out of the through hole and then retract; The first power unit includes a first lifting cylinder and a second lifting cylinder; the first lifting cylinder is vertically mounted on the first side plate; the cylinder body of the second lifting cylinder is fixedly connected to the lifting plate, and the piston rod of the second lifting cylinder is fixedly connected to the piston rod of the first lifting cylinder; After the piston rod of the first lifting cylinder is extended, the lifting plate rises to a position where the distance between the lifting plate and the first push block is greater than the outer diameter of one tube body and less than the sum of the outer diameters of the two tube bodies; the second power unit drives the first push block to extend to the top of the tube body at the bottom of the lifting plate, and then retracts it into the through hole; then the piston rod of the second lifting cylinder is extended to drive the lifting plate to continue to rise; The push tube assembly also includes a second push block and a return spring; One end of the second push block is transmission-connected to the second power unit, and the other end is provided with a wedge-shaped body which is narrow at the top and wide at the bottom; one end of the first push block close to the second push block is provided with a wedge-shaped hole which matches with the wedge-shaped body, and the other end is inserted into the through hole; The return spring is compressed between the first push block and the first side plate, thereby driving the first push block to retract into the through hole.

2. The upper tube device according to claim 1, characterized in that: The first push block is in a "convex" shape, comprising a push rod inserted in the through hole and a connecting block fixed to the push rod; the wedge-shaped hole is provided in the connecting block; An end of the connecting block close to the first side plate is provided with a receiving groove; one end of the return spring is inserted in the receiving groove, and the other end is connected to the first side plate.

3. The upper tube device according to claim 1, characterized in that: The silo includes a bottom plate installed on a frame and limit plates arranged on both sides of the bottom plate; the bottom plate and the limit plates on both sides form the cavity; there is a gap between the bottom plate and the lifting plate, and one end of the bottom plate close to the lifting plate is lower than the other end away from the lifting plate.

4. The upper tube device according to claim 3, characterized in that: The bottom plate comprises a rotating plate and a plurality of supporting rods which are inserted in the rotating plate in parallel and at intervals; two ends of the rotating plate are rotatably connected with the frame.

5. The upper tube device according to claim 4, characterized in that: The silo includes a locking screw and an adjustment plate for adjusting the distance between two limit plates; the adjustment plate is provided with a slide groove along its length direction; one end of the limit plate is fixedly connected to the adjustment plate; the locking screw passes through the slide groove and is threadedly connected to the frame.

6. The upper tube device according to claim 5, characterized in that: The upper tube device also includes a conveying track, a conveying belt, a conveying motor and a pushing cylinder; the conveying track is parallel to the lifting plate, and a notch is provided on the conveying track corresponding to the position of the cavity; the conveying belt is arranged in the conveying track; the conveying motor is installed on the conveying track and is connected to the conveying belt for driving the conveying belt to rotate; the pushing cylinder is installed on one side of the notch, so as to push the tube body on the conveying belt into the cavity.

7. The upper tube device according to any one of claims 1 to 6, characterized in that: One end of the top surface of the lifting plate close to the first side plate is lower than the other end away from the first side plate, thereby forming a V-shaped groove with the first side plate; the upper tube device also includes a guide plate fixed on the first side plate for guiding the tube body to the next workstation; the guide plate is provided with an inclined surface; after the lifting plate rises, the inclined surface of the guide plate can be connected with the top surface of the lifting plate.

8. The upper tube device according to claim 7, characterized in that: The upper tube device also includes centering cylinders symmetrically arranged on both sides of the guide plate.

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