Loading and unloading device of automatic punching device for metal pipe fittings

Abstract

The present invention relates to a loading and unloading device of an automatic punching device for metal pipe fittings, comprising: a workbench; a punching mechanism; a waste material discharging mechanism; a clamping and pushing mechanism, comprising a clamping seat assembly and a pushing driving member for driving the clamping seat assembly to reciprocate between a processing area and a loading and unloading area of ​​the workbench, the clamping seat assembly comprising a first positioning seat and a second positioning seat arranged at intervals in the front and rear directions of the workbench, the first positioning seat being provided with a first through hole that penetrates front and rear and is coaxially arranged with the metal pipe fitting clamped between the first positioning seat and the second positioning seat, so that a mandrel correspondingly cantilevered in the processing area of ​​the workbench can pass through the first through hole and extend into the corresponding metal pipe fitting, and when the waste material is pushed, the first through hole is sleeved on the mandrel to limit the free end of the mandrel. It has the advantages of avoiding bending of the mandrel, thereby improving the processing accuracy of the metal pipe fitting hole and improving the loading and unloading efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of metal pipe punching processing, and in particular to a loading and unloading device of an automatic punching device for metal pipe fittings. Background Art

[0002] Punching is a common processing technology in industrial production. For the processing of holes on the pipe wall, the punching method is used to make holes, which not only meets the quality requirements of the holes, but also has high processing efficiency and is more suitable for mass production. Existing pipe punching dies are mainly divided into two types: core dies and coreless dies.

[0003] For example, the Chinese invention patent with application number CN201410020329.4 (publication number CN104759523A) discloses a process equipment for processing metal tube wall holes with a core mold, including a stamping mechanism, a waste discharge mechanism and a metal tube clamping mechanism; the stamping mechanism is composed of a pressure cylinder, a punching needle driven by the pressure cylinder and a core rod; the punching needle faces the tube wall of the metal tube, the position of the punching needle is set according to the position of the hole in the metal tube wall, the core rod is sleeved in the metal tube, the diameter of the core rod is clearance-matched with the inner diameter of the metal tube, and the specific matching level is determined by the needs of the specific processing object, the surface of the core rod facing the punching needle is provided with a punching hole for sleeve-connecting the punching needle, and the end of the punching hole is also provided with a waste pushing hole that passes through the core rod; the waste discharge mechanism is composed of a waste pushing pressure cylinder and a waste pushing needle driven by the waste pushing pressure cylinder, and the waste pushing The needle is sleeved in the waste pushing hole of the core rod; the clamping mechanism clamps the metal tube tightly and transports it to the set position of the punching hole to be sleeved with the core rod. After the punching is completed, the metal tube is withdrawn from the core rod and the metal tube is released; the pressure cylinder drives the punching end of the punch needle to abut against the metal tube wall to punch out a set metal tube wall hole. After punching the metal tube wall hole, the waste is pressed into the punching hole of the core rod by the punch needle, and the pressure cylinder pulls the punch needle out of the metal tube wall hole. At this time, the clamping mechanism pulls the metal tube and the core rod out of the metal tube and releases the metal tube, and continues to clamp the next metal tube to be processed; the waste pushing pressure cylinder drives the waste pushing needle to push the waste in the punching hole of the core rod along the waste pushing hole of the core rod and push the waste out of the punching hole. The waste pushing pressure cylinder then pulls the waste pushing needle back into the waste pushing hole. At this point, the stamping process of a metal tube wall hole is completed, and this process is cyclic during continuous processing.

[0004] However, the process equipment for processing metal tube wall holes in the above patent still has certain shortcomings. First, in order to facilitate the metal tube fitting to be sleeved on the core rod, the core rod of the stamping mechanism is cantilevered, that is, one end of the core rod is fixed and the other end is suspended. Correspondingly, the clamping mechanism also clamps one end of the metal tube fitting, so as to transport the metal tube to the set position of the punching hole and sleeve it with the core rod. However, after the core rod is withdrawn relative to the core rod after the metal tube hole processing is completed, it is necessary to drive the waste pushing needle through the waste pushing pressure cylinder to push the waste in the core rod punching hole along the waste pushing hole of the core rod and push the waste out of the punching hole. After a certain period of use, the core rod will inevitably bend due to the impact of the waste pushing needle, which will lead to the punching of the core rod and the waste pushing needle. The feed hole is offset, which affects the punching accuracy of the metal pipe fittings. What's worse, it makes it difficult for the metal pipe fittings to be sleeved on the core rod, and the core rod needs to be replaced regularly. More seriously, the waste push needle may be damaged due to the mismatch between the waste push needle and the waste push hole of the core rod; secondly, the existing metal pipe punching devices mostly use manual loading and unloading, that is, the metal pipe fittings are placed on the clamping mechanism of the metal pipe manually, so that the clamping mechanism clamps the metal pipe fittings, and then the clamping mechanism drives the metal pipe fittings to be moved to the set position of the punching hole and sleeved with the core rod. After the punching process is completed, the clamping mechanism pulls the metal pipe and the core rod apart, then releases the metal pipe, and manually removes the processed metal pipe fittings, which results in low efficiency of metal pipe punching. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a loading and unloading device for an automatic punching device for metal pipes, which can avoid bending of the core rod and thus improve the processing accuracy of the holes of the metal pipes, in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a loading and unloading device for an automatic punching device for metal pipes, which is convenient for automatic loading and unloading of metal pipes, in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the first technical problem is: a loading and unloading device of an automatic punching device for metal pipe fittings, comprising:

[0008] A workbench, on which a processing area for punching metal pipes is provided at the front side and a loading and unloading area is provided at the rear side;

[0009] The clamping and pushing mechanism includes a clamping seat assembly for clamping the two ends of the metal pipe and a pushing driving member for driving the clamping seat assembly to reciprocate between the processing area and the loading and unloading areas of the workbench. The clamping seat assembly includes a first positioning seat and a second positioning seat spaced apart in the front-to-back direction of the workbench, the first positioning seat being closer to the processing area of ​​the workbench relative to the second positioning seat, the first positioning seat being provided with a first through hole which penetrates front and back and is coaxially arranged with the metal pipe clamped between the first positioning seat and the second positioning seat, so that a corresponding core rod cantilevered in the processing area of ​​the workbench can pass through the first through hole and extend into the corresponding metal pipe, and when the waste discharge mechanism performs the waste pushing action, the first through hole can be sleeved on the core rod to limit the core rod.

[0010] In order to enable the mandrel to smoothly enter the first through hole of the first positioning seat when the clamping seat assembly moves toward the mandrel, the free end of the mandrel is gradually reduced to guide the free end of the mandrel to be inserted into the first through hole of the first positioning seat. Specifically, the free end of the mandrel can be set to a guide arc surface or a guide inclined surface structure.

[0011] The technical solution adopted by the present invention to solve the second technical problem is:

[0012] The first positioning seat is provided with a first positioning groove for the first end of the metal pipe to slide into and out of, and the first positioning groove has the same direction as the first through hole and is connected with the first through hole; the second positioning seat is provided with a second positioning groove for the second end of the metal pipe to slide into and out of, and the second positioning groove is arranged in the same direction and at the same height as the first positioning groove, and the first positioning groove and the second positioning groove together constitute a clamp for receiving the metal pipe.

[0013] In order to ensure that the metal pipe can be securely fixed in a set position when it is placed in the corresponding first positioning groove of the clamping seat assembly, the width of the first positioning groove is adapted to the outer diameter of the metal pipe, the first through hole is a cylindrical hole, and the peripheral edge of the rear port of the first through hole abuts against the end of the metal pipe. Specifically, the inner diameter of the first through hole can be less than or equal to the inner diameter of the metal pipe.

[0014] In order to ensure that the metal pipe to be processed can be automatically clamped when it is placed in the corresponding first positioning groove of the clamping seat assembly, thereby ensuring the reliability of the fixation of the metal pipe, the second positioning seat is provided with an elastic mechanism that can act on the end of the metal pipe and axially clamp the metal pipe between the first positioning seat and the second positioning seat, and the elastic mechanism is provided with the second positioning groove.

[0015] In order to facilitate the assembly of the elastic mechanism, the elastic mechanism includes:

[0016] A movable block is arranged on the second positioning seat and can be movably arranged forward and backward relative to the second positioning seat. The side wall of the movable block has a guide groove for the corresponding end of the metal pipe to slide into, and the guide groove constitutes the second positioning groove of the second positioning seat;

[0017] The elastic member acts on the movable block, so that the movable block always has a tendency to move away from the second positioning seat in the front-rear direction of the workbench, so that the movable block abuts against the corresponding end position of the metal pipe.

[0018] In order to facilitate the end of the metal pipe to slide smoothly into the guide groove and remain stably in the guide groove, the guide groove of the movable block includes an entrance portion and a receiving portion, and the bottom surface of the entrance portion of the guide groove is a guide arc surface / guide inclined surface for guiding the metal pipe into the receiving portion. When the elastic mechanism is in a free state, a first axial distance between the entrance portion of the guide groove and another positioning groove is greater than the length of the metal pipe, and a second axial distance between the receiving portion of the movable block and another positioning groove is less than the length of the metal pipe.

[0019] In order to enable the metal workpiece to be processed to be quickly clamped onto the clamping seat assembly and to enable the metal pipe fittings after processing to be quickly unloaded from the clamping seat assembly, it also includes a loading mechanism and an unloading mechanism arranged in the loading and unloading areas of the workbench, the loading mechanism and the unloading mechanism are respectively located on the left and right sides of the clamping and pushing mechanism, the loading mechanism is arranged on the side of the opening of the first positioning groove on the workbench, and is used to transport and clamp the metal pipe fittings to be processed between the first positioning seat and the second positioning seat of the clamping seat assembly, and the unloading mechanism is arranged on the side of the opening of the first positioning groove on the workbench away from the first positioning seat, and is used to remove the metal pipe fittings after processing from between the first positioning seat and the second positioning seat of the clamping seat assembly. The spatial arrangement of the above-mentioned loading mechanism and unloading mechanism is more reasonable, so that the loading and unloading process can be carried out in sequence and smoothly.

[0020] As an improvement, the feeding mechanism comprises:

[0021] A workpiece lifting assembly includes a feed rack, a lifting drive and a workpiece bracket, wherein the feed rack is tilted so that the metal pipe to be processed can be automatically moved to a workpiece bracket corresponding to a low position of the feed rack, and the workpiece bracket is connected to the action end of the lifting drive and moves up and down reciprocatingly with the action end of the lifting drive;

[0022] A loading clamp, used to clamp the metal pipe to be processed lifted up by the workpiece bracket and release the metal pipe;

[0023] A feeding drive member, whose active end is connected to the feeding clamp, is used to drive the metal pipe clamped by the feeding clamp to move toward the clamping seat assembly so that the two ends of the metal pipe are clamped into the first positioning groove of the first positioning seat and the corresponding second positioning groove of the second positioning seat, and reset to the initial position.

[0024] As an improvement, the feeding mechanism comprises:

[0025] A material unloading driving member, the working end of which is connected to a material pushing block, for driving the material pushing block to move toward the clamping seat assembly to push out the processed metal pipe fitting on the clamping seat assembly, and reset it to an initial position;

[0026] The unloading rack is arranged tilted from top to bottom, and the feed port at the upper end is connected to the bottom of the loading and unloading area of ​​the workbench, and corresponds to the first unloading port corresponding to the first unloading port arranged on the workbench and located under the clamping seat assembly in the upper and lower directions, and the discharge port at the lower end extends to the outside of the workbench.

[0027] Compared with the prior art, the advantages of the present invention are as follows: when the metal pipe to be processed clamped on the clamping seat assembly is pushed to the processing area located on the front side of the workbench, the first through hole on the first positioning seat of the clamping seat assembly can be used for the core rod corresponding to the processing area of ​​the workbench to pass through, so that the core rod extends into the corresponding metal pipe, and the metal pipe sleeved on the core rod is punched by the stamping mechanism, and after the punching of the metal pipe is completed, when the clamping seat assembly moves backward, the waste pushing hole on the core rod can expose the metal pipe, and the waste pushing operation can be performed at this time. When the waste pushing operation is performed, the first through hole of the first positioning seat can still be sleeved on the core rod to limit the free end of the core rod. In this way, since both ends of the core rod are limited, the waste pushing needle of the waste discharge mechanism will remain in the waste ejection process of the core mold, and the core rod is not easy to bend, thereby ensuring the accuracy of the punching processing of the metal pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a three-dimensional structure from another angle of an embodiment of the present invention;

[0030] Figure 3 A top view of an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the clamping and pushing mechanism according to an embodiment of the present invention;

[0032] Figure 5 for Figure 4 Schematic diagram of the structure at the middle and back angles;

[0033] Figure 6 It is a left side view of the clamping and pushing mechanism according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the clamping and pushing mechanism of an embodiment of the present invention (without clamping the metal pipe fitting);

[0035] Figure 8 for Figure 7 A partial exploded view of

[0036] Fig. 9 It is a horizontal cross-sectional view of the clamping and pushing mechanism of an embodiment of the present invention (clamping a metal pipe fitting);

[0037] Fig.10 for Fig. 9 The state diagram of the metal pipe being detached;

[0038] Fig.11 It is a partial view of the clamping and pushing mechanism of the embodiment of the present invention;

[0039] Fig.12 It is a schematic diagram of a three-dimensional structure in which a first through hole of a first positioning seat of a clamping and pushing mechanism according to an embodiment of the present invention is sleeved on a free end of a core rod;

[0040] Fig.13 It is a schematic diagram of the three-dimensional structure of the fixed die of the stamping mechanism according to an embodiment of the present invention;

[0041] Fig.14 A front side view of a fixed die of a punching mechanism according to an embodiment of the present invention;

[0042] Fig.15 for Fig.14 Sectional view at AA in the middle;

[0043] Fig.16 It is a schematic diagram of the three-dimensional structure of the movable mold of the stamping mechanism according to an embodiment of the present invention.

[0044] Reference numerals: 10, workbench; 100, metal pipe; 11, first slide rail; 101, processing area; 102, loading and unloading area; 103, first blanking opening; 104, second blanking opening; 12, support plate; 13, slide bar; 14, suspension; 15, second slide rail; 16, second sliding seat; 17, material blocking plate; 20, clamping and pushing mechanism; 21, first positioning seat; 210, first through hole; 211, first positioning groove; 22, second positioning seat; 2 20, second through hole; 221, second positioning groove; 222, mounting groove; 23, push drive member; 231, drive member body; 232, drive shaft; 24, first sliding seat; 25, upper connecting rod; 26, lower connecting rod; 27, support seat; 270, first guide hole; 30, elastic mechanism; 301, entrance; 302, accommodating portion; 31, movable block; 32, elastic member; 310, guide slope; 311, guide column; 33, limit nut; 400, stamping mechanism; 401, avoidance groove; 40, stamping die; 41, fixed die; 410, first half groove; 411, third through hole; 42, movable die; 420, second half groove; 421, punching needle; 43, stamping drive member; 44, core rod; 440, punching hole; 441, waste pushing hole; 442, guide cone; 500, waste discharge mechanism; 50, waste pushing drive member; 51, third sliding seat; 511, second guide hole; 510, Waste pushing needle; 52, waste slide rack; 60, loading mechanism; 61, workpiece lifting assembly; 62, feed rack; 63, lifting drive; 64, workpiece bracket; 640, bracket structure; 65, loading clamp; 66, loading drive; 70, unloading mechanism; 71, unloading drive; 72, pushing block; 73, unloading rack; 74, third slide rail; A, gap space; d, length of metal pipe; L1, first axial distance; L2, second axial distance. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below with reference to the accompanying drawings.

[0046] See also Figure 1-Figure 16 The loading and unloading device of the automatic punching device for metal pipe fittings includes a workbench 10, a loading and unloading mechanism, a clamping and pushing mechanism 20 and a control system.

[0047] See also Figure 3 The workbench 10 can be a supporting platform. The top surface of the workbench 10 is divided into a processing area 101 for processing the metal pipe 100 and a loading and unloading area 102 (by Figure 3The dotted circle is roughly marked). The processing area 101 is located in the front area of ​​the workbench 10, and the loading and unloading area 102 is located in the rear area of ​​the workbench 10. Specifically, the punching mechanism 400 and the waste discharge mechanism 500 of the metal pipe automatic punching device are both located in the processing area 101 of the workbench 10, and the loading and unloading mechanism is located in the loading and unloading area 102 of the workbench 10.

[0048] Combination Figure 1 and Figure 2 The clamping and pushing mechanism 20 is arranged on the workbench 10. The clamping and pushing mechanism 20 includes a clamping seat assembly and a pushing driving member 23 for driving the clamping seat assembly to reciprocate between the processing area 101 and the loading and unloading area 102 of the workbench 10. The clamping seat assembly is used to clamp the two ends of the metal pipe 100 to fix the metal pipe 100, so that the metal pipe 100 is sent to the processing area 101 of the workbench 10 for punching processing under the drive of the pushing driving member 23.

[0049] Continue to see Figure 3 The stamping mechanism 400 includes a stamping die 40 and a stamping drive 43. The stamping die 40 is used to clamp the metal pipe 100 sent to the processing area 101 by the clamping and pushing mechanism 20, wherein the axial direction of the metal pipe 100 fixed to the clamping and pushing mechanism 20 is consistent with the front-to-back direction of the workbench 10. The stamping die 40 specifically includes a fixed die 41 and a movable die 42 sequentially arranged in the left-right direction of the workbench 10, wherein the fixed die 41 is fixed on the workbench 10, and the movable die 42 is connected to the action end of the stamping drive 43 and can be close to or away from the fixed die 41. The stamping drive 43 in this embodiment can be selected as a cylinder.

[0050] Combination Figure 13-Figure 16 The movable die 42 of the stamping die 40 is fitted with the fixed die 41 to form a cylindrical groove that matches the outer diameter of the metal pipe 100. Specifically, the cylindrical groove is formed by the first half groove 410 correspondingly arranged on the wall surface of the fixed die 41 and the second half groove 420 arranged on the movable die 42. The front part of the fixed die 41 is also provided with a mandrel 44 that extends backward and is in a cantilevered state, wherein the mandrel 44 is in a "cantilevered state" means that the front end of the mandrel 44 is fixed on the fixed die 41, and the rear end of the mandrel 44 extends into the first half groove 410 of the fixed die 41 and is suspended in the air. Specifically, there is a gap between the outer wall of the mandrel 44 and the inner wall of the first half groove 410, and the size of the gap is adapted to the wall thickness of the metal pipe 100. When the metal pipe 100 moves forward to the processing area 101 along with the clamping seat assembly, the metal pipe 100 can extend into the first half groove 410 of the fixed die 41 and sleeved outside the core rod 44. In this embodiment, the length of the core rod 44 is substantially the same as the length of the metal pipe 100 to be processed.

[0051] See also Fig.16, a punching needle 421 extending toward the mandrel 44 of the fixed mold 41 is provided on the inner wall of the second half groove 420 on the movable mold 42, and correspondingly, a punching hole 440 for sleeve-connecting the punching needle 421 is provided on the surface of the mandrel 44 facing the punching needle 421. More specifically, a waste material pushing hole 441 which passes through the mandrel 44 transversely is also provided at the end of the punching hole 440 of the mandrel 44, that is, the punching hole 440 of the mandrel 44 in this embodiment is connected with the waste material pushing hole 441 to form a stepped hole structure, wherein the structure of the punching hole 440 and the waste material pushing hole 441 of the mandrel 44 is the prior art, and the details can be referred to the "Process Equipment for Processing Metal Pipe Wall Holes with a Mandrel Mold" disclosed in the Chinese invention patent with application number CN201410020329.4 (publication number CN104759523A).

[0052] See also Figure 3 , the waste discharge mechanism 500 is located on the left side of the fixed die 41. The waste discharge mechanism 500 includes a waste pushing driving member 50 and a third sliding seat 51 connected to the action end of the waste pushing driving member 50. The third sliding seat 51 has a waste pushing needle 510 on the wall facing the fixed die 41. Correspondingly, the fixed die 41 has a third through hole 411 that passes through the left and right sides. The waste pushing needle 510 can pass through the third through hole 411 of the fixed die 41 and insert into the waste pushing hole 441 of the core rod 44, thereby pushing out the waste remaining in the punching hole 440 of the core rod 44 during the stamping process. In this embodiment, the waste pushing needle 510 can be always inserted in the third through hole 411 during the pushing process, or it can be removed from the third through hole 411 when it is away from the fixed die. The processing area 101 of the workbench 10 is also provided with a waste collecting device for collecting the waste pushed out by the waste pushing needle 510.

[0053] See also Figure 6 The waste collection device includes a waste slide rack 52, wherein the waste slide rack 52 is tilted from top to bottom. The feed port of the waste slide rack 52 at the upper end is connected to the bottom of the processing area 101 of the workbench 10, wherein the workbench 10 is provided with a second drop port 104, and the feed port of the waste slide rack 52 is engaged at the position of the second drop port 104 of the workbench 10. Specifically, the second drop port 104 is correspondingly located under the core rod 44 of the fixed mold 41, so that the waste pushed by the waste push needle 510 falls from the second drop port 104 of the workbench 10 and enters the waste slide rack 52. More specifically, the discharge port of the waste slide rack 52 at the lower end corresponds to extending forward to the outside of the workbench 10, and a waste collection frame (not shown) can be placed at the discharge port of the waste slide rack 52 to receive the waste that slides down automatically.

[0054] See also Figure 3, the workbench 10 is provided with two upright support plates 12 in the processing area 101. The two support plates 12 are spaced apart in the left-right direction of the workbench 10. Both support plates 12 are square in shape, and the two square plates extend in the front-back direction of the workbench 10. Four slide bars 13 are connected between the two square plates, wherein the four slide bars 13 are arranged at the four corners of the square plates. The waste pushing drive member 50 can be an oil cylinder, which is arranged on the wall of the support plate 12 on the left side, and the third sliding seat 51 is provided with second guide holes 511 for the above-mentioned four slide bars 13 to pass through respectively, so that it is slidably arranged on the above-mentioned four slide bars 13 left and right through the four second guide holes 511, and is driven by the above-mentioned oil cylinder. Similarly, the stamping drive member 43 can also be selected as a cylinder and fixed on the support plate 12 located on the right side. The movable mold 42 of the stamping mold 40 is also provided with second guide holes 511 for the above-mentioned four sliding rods 13 to pass through respectively, so that it is slidably arranged on the above-mentioned four sliding rods 13 left and right through the four second guide holes 511 and driven by the stamping drive member 43.

[0055] See also Figure 3 and Figure 4 In this embodiment, two support seats 27 are also provided on the workbench 10. The two support seats 27 are spaced apart in the front-to-back direction of the workbench 10. Specifically, the support seat 27 located on the rear side corresponds to the loading and unloading area 102 of the workbench 10, and the support seat 27 located on the front side corresponds to the processing area 101 of the workbench 10, specifically, located in front of the stamping die 40 (fixed die 41). In this embodiment, the push drive member 23 of the clamped push mechanism 20 can be selected as a cylinder (of course, it can also be an oil cylinder, a motor and other existing technologies). The push drive member 23 is specifically fixed on the support seat 27 located on the rear side of the workbench 10. The push drive member 23 includes a drive member body 231 (cylinder body) and a drive shaft 232 that can be retracted back and forth relative to the drive member body 231. The two positioning seats are both provided on the drive shaft 232 of the drive member and move back and forth with the drive shaft 232.

[0056] See also Figure 4 The end of the driving shaft 232 of the push drive member 23 is provided with a first sliding seat 24, and the workbench 10 is provided with a first slide rail 11 extending forward and backward, and the first sliding seat 24 is slidably arranged on the first slide rail 11. The first sliding seat 24 is provided with an upper connecting rod 25 and a lower connecting rod 26 extending forward and arranged in layers in the up-down direction. Specifically, the upper connecting rod 25 and the lower connecting rod 26 are both arranged horizontally, wherein a first guide hole 270 penetrating forward and backward for the upper connecting rod 25 and the lower connecting rod 26 to pass through is provided on the support seat 27 located at the front side of the workbench 10, so that under the drive of the push drive member 23, the upper connecting rod 25 and the lower connecting rod 26 can move back and forth more smoothly.

[0057] See also Fig.12 and Fig.15 The two opposite walls of the fixed die 41 and the movable die 42 of the stamping die 40 are respectively provided with avoidance grooves 401 for the upper connecting rod 25 and the lower connecting rod 26 to pass through.

[0058] See also Figure 4 and Figure 5 The clamping seat assembly of the clamping and pushing mechanism 20 includes a first positioning seat 21 and a second positioning seat 22 arranged at intervals in the front-to-back direction of the workbench 10, wherein the first positioning seat 21 is closer to the processing area 101 of the workbench 10 than the second positioning seat 22. Specifically, the two positioning seats are fixed on the upper connecting rod 25 and the lower connecting rod 26. More specifically, the first positioning seat 21 is provided with a first positioning groove 211 for the first end of the metal pipe 100 to slide into and also to escape from. In this embodiment, the first positioning groove 211 is a horizontal slide groove extending in the front-to-back direction, and is closed at the front end, and the notch of the horizontal slide groove faces the left side. Similarly, the second positioning seat is provided with a second positioning groove for the second end of the metal pipe 100 to slide into and also to escape from. The second positioning groove is arranged in the same direction and at the same height position as the first positioning groove, that is, the second positioning groove is also a horizontal slide groove extending in the front-to-back direction, and is closed at the rear end, and the notch of the horizontal slide groove also faces the left side.

[0059] See also Figure 4 In this embodiment, the height positions of the first positioning groove 211 on the first positioning seat 21 and the second positioning groove 221 on the second positioning seat 22 are located between the upper connecting rod 25 and the lower connecting rod 26, so that the metal pipe fitting 100 clamped between the positioning grooves of the two positioning seats is also correspondingly located in the gap space A between the upper connecting rod 25 and the lower connecting rod 26, which greatly facilitates the loading and unloading operations of the metal pipe fitting 100, wherein the loading mechanism 60 and the unloading mechanism 70 can be arranged on both sides of the connecting rod, when performing the loading action of the metal pipe fitting 100 (clamping the metal pipe fitting 100 between the two positioning seats) or the unloading action (pushing the metal pipe fitting 100 from between the two positioning seats), the loading mechanism 60 can push the metal pipe fitting 100 onto the clamping seat assembly on one side of the upper and lower connecting rods, and correspondingly, the unloading mechanism 70 can push the metal pipe fitting 100 off the clamping seat on the other side of the upper and lower connecting rods.

[0060] Combination Figure 8 and Fig. 9In order to make the metal pipe 100 to be processed automatically clamped when placed in the corresponding first positioning groove of the clamping seat assembly, thereby ensuring the reliability of the fixing of the metal pipe 100, a mounting groove 222 is provided on the side wall of the second positioning seat 22 facing the first positioning seat 21, and an elastic mechanism 30 is provided in the mounting groove 222, which can act on the corresponding end (rear end) of the metal pipe 100 to clamp the metal pipe 100 in the first positioning groove 211 of the first positioning seat 21 along the axial direction of the metal pipe 100. In order to facilitate the assembly of the elastic mechanism 30 and avoid the metal pipe 100 pushed from the left side, the mounting groove 222 of the second positioning seat 22 in this embodiment is a semi-enclosed notch groove.

[0061] Combination Figure 8 and Fig. 9 The elastic mechanism 30 of this embodiment includes a movable block 31 and an elastic member 32, wherein the movable block 31 can be movably arranged in the mounting groove 222 of the second positioning seat 22 relative to the second positioning seat 22. The front side wall of the movable block 31 has a guide groove for the corresponding end of the metal pipe 100 to slide into, and the guide groove constitutes the second positioning groove 221 of the second positioning seat 22, that is, the guide groove of the movable block 31 in this embodiment is a semi-closed notch groove. On the other hand, the guide groove of the movable block 31 in this embodiment includes an entrance portion 301 and a receiving portion 302. In order to allow the end of the metal pipe 100 to slide smoothly into the guide groove, the bottom surface of the entrance portion 301 of the guide groove is a guiding inclined surface 310 (or a guiding arc surface 310) for guiding the metal pipe 100 into the receiving portion 302. When the elastic mechanism is in a free state, a first axial distance L1 between the entrance portion 301 of the guide groove and another positioning groove is greater than a length d of the metal pipe, and a second axial distance L2 between the receiving portion of the movable block and another positioning groove is less than a length d of the metal pipe. In this way, when the metal pipe is pushed over, automatic clamping can be achieved. See for details. Fig. 9 and Fig.10 .

[0062] Combination Figure 8 and Fig. 9 The shape and size of the movable block 31 of the elastic mechanism 30 are adapted to the mounting groove 222 of the second positioning seat 22, thereby ensuring the stability of the forward and backward movement of the movable block 31. In order to enable the movable block 31 to move forward and backward smoothly relative to the positioning seat under the action of the elastic member 32, the movable block 31 has a guide column 311 extending backward on the side wall away from the guide groove, and the second positioning seat 22 has a second through hole 220 extending in the forward and backward direction at the bottom wall of the mounting groove 222 for the guide column 311 of the movable block 31 to pass through, and the end of the guide column 311 of the movable block 31 is connected to a limiting nut 33.

[0063] Combination Figure 8 and Fig. 9The elastic member 32 of this embodiment can be selected as a compression spring, wherein the compression spring is sleeved on the guide column 311 of the movable block 31 and extends into the second through hole 220 of the second positioning seat 22. Specifically, the second through hole 220 of the second positioning seat 22 is a stepped hole that is larger at the front and smaller at the back. The front end of the compression spring abuts against the rear side wall of the movable block 31, and the rear end of the compression spring abuts against the step (not shown) of the stepped hole of the second positioning seat 22, so that the movable block 31 always has a tendency to move away from the second positioning seat 22 in the front-to-back direction along the workbench 10, so as to ensure that the movable block 31 can firmly abut against the corresponding end position of the metal pipe 100.

[0064] See also Figure 4 and Figure 7 In order to enable the metal pipe 100 to be processed, which is clamped on the two positioning seats, to be correspondingly sleeved on the core rod 44 during the process of transferring the metal pipe 100 to the processing area 101 of the workbench 10, the first positioning seat 21 is provided with a first through hole 210 that penetrates front and back, and the first positioning groove 211 of the first positioning seat 21 is connected with the first through hole 210. Specifically, the first through hole 210 is coaxially arranged with the metal pipe 100 clamped between the first positioning seat 21 and the second positioning seat 22, so that the core rod 44 correspondingly cantilevered in the processing area 101 of the workbench 10 passes through the first through hole 210 and extends into the corresponding metal pipe 100. In order to keep the metal pipe 100 placed in the corresponding first positioning groove of the clamping seat assembly stably and securely in the set position, the width of the first positioning groove 211 of the first positioning seat 21 and the second positioning groove 221 of the second positioning seat 22 (and the guide groove of the movable block 31) are both adapted to the outer diameter of the metal pipe 100, wherein the width of the corresponding positioning groove is preferably just enough to allow the end of the metal pipe 100 to be inserted, and after being inserted, there will be no large floating or offset in the up and down directions. On the other hand, the first through hole 210 of the first positioning seat 21 is a cylindrical hole, and the inner diameter of the first through hole 210 is smaller than the outer diameter of the metal pipe 100. Specifically, it can be appropriately selected according to the wall thickness of the metal pipe 100, so that the end of the metal pipe 100 can resist the peripheral edge of the rear port of the first through hole 210, and can ensure that the core rod 44 can pass smoothly.

[0065] In this embodiment, after the core rod 44 is withdrawn from the core rod 44 after the hole processing of the metal pipe 100 is completed, it is necessary to drive the waste pushing needle 510 through the waste pushing driving member 50 to push the waste in the punching hole 440 of the core rod 44 along the waste pushing hole 441 of the core rod 44 and push the waste out of the punching hole 440. However, after a certain period of use, the core rod 44 will inevitably bend due to the impact of the waste pushing needle 510, thereby causing the punching hole 440 and the waste pushing hole 441 of the core rod 44 to deviate. Thus, the precision of the punching hole 440 of the metal pipe 100 is affected. To solve this problem, an important invention of this embodiment is that after the punching process is completed, the metal pipe 100 can move away from the mandrel 44 to expose the waste pushing hole of the mandrel, and then the waste discharge mechanism 500 performs the waste pushing action. At this time, the first through hole 210 set on the first positioning seat 21 can still be sleeved on the mandrel 44, specifically, it can be sleeved on the free end of the mandrel 44 to limit the mandrel 44. In this way, in the process of ejecting the waste remaining in the core mold through the waste pushing needle 510 of the waste discharge mechanism 500, since both ends of the mandrel 44 are limited, the mandrel 44 is not easy to bend, thereby ensuring the precision of the punching process of the metal pipe 100. In order to make the automatic end of the mandrel 44 more reliable, the inner diameter of the first through hole 210 of the first positioning seat 21 is adapted to the outer diameter of the mandrel 44 at least at the front end position. Specifically, there may be a slight gap between the front end of the first through hole 210 of the first positioning seat 21 and the outer wall of the core rod 44, but it is enough to ensure that the free end of the core rod 44 is fixed when the core rod 44 is impacted by the waste pushing needle 510. Fig.12 .

[0066] More specifically, in the present embodiment, during the reciprocating movement of the clamping seat assembly, the first through hole 210 of the first positioning seat 21 can be always mounted on the core rod 44, that is, during the reciprocating movement of the first positioning seat 21 with the driving shaft 232 of the pushing drive member 23, the first through hole 210 of the first positioning seat 21 never separates from the core rod 44, wherein, when the first positioning seat 21 moves backward to the loading and unloading area 102 of the workbench 10 for loading and unloading, the first through hole 210 of the first positioning seat 21 is mounted on the free end position of the core rod 44, at this time, the free end position of the core rod 44 does not expose the rear end port of the first through hole 210 of the first positioning seat 21, thereby ensuring that the end of the metal pipe 100 to be processed can slide smoothly into the first positioning groove 211 during loading.

[0067] Of course, it is also possible that, during the reciprocating movement of the clamping seat assembly, the first through hole 210 of the first positioning seat 21 is not always sleeved on the core rod 44, that is, under the control of the control system, the first positioning seat 21 can stay in three positions in sequence during the reciprocating sliding movement of the first sliding seat 24 driven by the push drive 23. Among them, when the first positioning seat 21 stays at the first position, the first positioning seat 21 is located in the loading and unloading area 102, and the loading and unloading operation of the metal pipe 100 is performed. At this time, the first through hole 210 of the first positioning seat 21 has been out of the free end of the core rod 44; when the first positioning seat 21 stays at the second position, the first positioning seat 21 is located in the processing area 101 of the workbench 10, and the punching operation of the metal pipe 100 is performed. At this time, the metal pipe 100 on the clamping seat assembly It is sleeved on the core rod 44. Of course, the first through hole 210 of the first positioning seat 21 is also sleeved on the core rod 44, specifically located at the root of the core rod 44 (i.e. the front end position); when the first positioning seat 21 stays at the third position, the first positioning seat 21 is located between the loading and unloading area 102 and the processing area 101, and the waste ejection operation is performed. At this time, the first through hole 210 of the first positioning seat 21 is sleeved on the free end of the core rod 44, and the free end of the core rod 44 is limited. After the waste ejection operation is completed, the push drive member 23 drives the first positioning seat 21 to continue to slide backward to the above-mentioned first position for loading and unloading operations. During this backward movement, the first through hole 210 of the first positioning seat 21 will slip out of the free end of the core rod 44.

[0068] Combination Fig.14 and Fig.15 Since the first through hole 210 of the first positioning seat 21 is not always mounted on the core rod 44, in order to enable the core rod 44 to smoothly enter the first through hole 210 of the first positioning seat 21 when the clamping seat assembly moves toward the core rod 44, the free end of the core rod 44 gradually shrinks to guide the free end of the core rod 44 to be inserted into the first through hole 210 of the first positioning seat 21. Specifically, the free end of the core rod 44 has a guide cone surface or a guide arc surface or a guide inclined surface 442 that gradually shrinks along the extension direction of the core rod 44.

[0069] See also Figure 1-Figure 3, the loading and unloading mechanism includes a loading mechanism 60 and a unloading mechanism 70. The loading mechanism 60 and the unloading mechanism 70 are arranged in the loading and unloading area 102 of the workbench 10 and are respectively located on the left and right sides of the clamping and pushing mechanism 20. Specifically, the loading mechanism 60 is arranged on the workbench 10 and is located on the left side of the clamping and pushing mechanism 20, that is, it is located on the side corresponding to the opening of the first positioning groove facing the corresponding positioning seat, so as to transport and clamp the metal pipe 100 to be processed to between the first positioning seat 21 and the second positioning seat 22 of the clamping seat assembly. The unloading mechanism 70 is arranged on the workbench 10 and is located on the right side of the clamping and pushing mechanism 20, that is, it is located on the side of the opening of the first positioning groove on the workbench 10 away from the first positioning groove, so as to push the metal pipe 100 after processing from between the first positioning seat 21 and the second positioning seat 22 of the clamping seat assembly.

[0070] See also Figure 1 as well as Figure 2 The feeding mechanism 60 includes a workpiece lifting assembly 61, a feeding clamp 65 and a feeding drive 66. A suspension 14 is provided between the two support plates 12 on the workbench 10. The bottom of the suspension 14 is provided with the above-mentioned feeding drive 66 and a second slide rail 15 extending left and right. The second slide rail 15 is provided with a second sliding seat 16, and the second sliding seat 16 is connected to the action end of the feeding drive 66. The feeding drive 66 in this embodiment can be selected as a cylinder. A feeding clamp 65 is provided on the first sliding seat 24. Under the control of the control system, the feeding clamp 65 can be automatically opened and closed, thereby clamping and releasing the metal pipe 100. Among them, the feeding clamp 65 can adopt existing technologies such as servo clamps and cylinder-driven clamps.

[0071] See also Figure 1 as well as Figure 2 , the workpiece lifting assembly 61 includes a feed rack 62, a lifting drive 63 and a workpiece bracket 64. The feed rack 62 can be arranged on the side wall of the workbench 10. Specifically, the feed rack 62 is a rectangular box structure, and the feed rack 62 is used to place the metal pipes 100 to be processed, wherein the width of the feed rack 62 is substantially consistent with the length of the metal pipes 100. The feed rack 62 is tilted from left to right, that is, at least the bottom surface of the feed rack 62 is tilted, wherein the left side of the bottom surface of the feed rack 62 in this embodiment is high and the right side is low. The lifting drive 63 and the workpiece bracket 64 are correspondingly arranged at the right low position of the feed rack 62, wherein the workpiece bracket 64 is connected to the active end of the lifting drive and moves back and forth up and down with the active end of the lifting drive.

[0072] See also Figure 1 as well as Figure 2The workpiece bracket 64 includes two bracket structures 640 extending upward and spaced apart, and the tops of the two bracket structures 640 have semicircular arc grooves (not shown) adapted to the metal pipe 100, which can accommodate one metal pipe 100. When the workpiece bracket 64 moves down to the low position, the arc groove at the top of the bracket structure 640 of the workpiece bracket 64 is slightly lower than the bottom surface of the feed rack 62 or flush with the bottom surface of the feed rack 62, so that the metal pipe 100 can automatically roll into the arc groove at the top of the bracket structure 640 of the workpiece bracket 64 under the action of its own gravity. When the workpiece bracket 64 drives the metal workpiece to rise to a high position, the loading clamp 65 can clamp the metal hanger on the workpiece bracket 64, and under the action of the loading drive 66, move toward the clamping seat assembly so that the two ends of the metal pipe 100 are inserted into the corresponding first positioning grooves of the first positioning seat 21 and the second positioning seat 22, and then the loading clamp 65 is reset to its initial position.

[0073] See also Figure 1-Figure 3 The unloading mechanism 70 includes an unloading driving member 71 and an unloading frame 73. The unloading driving member 71 in this embodiment can be a cylinder, and a pusher block 72 is connected to the working end of the cylinder. Under the driving action of the cylinder, the pusher block 72 moves toward the clamping seat assembly, pushes the metal pipe 100 processed on the clamping seat assembly outward along the corresponding first positioning groove, and then resets to the initial position. In order to ensure that the pusher block 72 moves smoothly in the left and right directions of the workbench 10, a third slide rail 74 extending left and right is provided on the workbench 10, and the pusher block 72 is slidably arranged on the third slide rail 74.

[0074] Combination Figure 5 , the material unloading rack 73 is tilted from top to bottom. Specifically, the material inlet at the upper end of the material unloading rack 73 is connected to the bottom of the loading and unloading area 102 of the workbench 10, and the material outlet at the lower end of the material unloading rack 73 extends backward to the outside of the workbench 10. The workbench 10 is also provided with a first material unloading opening 103, which is roughly located below the clamping seat assembly and corresponds to the material inlet of the material unloading rack 73 in the vertical direction. A baffle plate 17 extending upward and tilting is also provided at the left edge of the first material unloading opening 103, so that the falling metal pipe 100 can accurately fall into the first material unloading opening 103.

[0075] The advantages of the loading and unloading device of the automatic punching device for metal pipe fittings of this embodiment are as follows: first, the two positioning seats of the loading and unloading device are arranged at intervals, and positioning grooves for the two ends of the metal pipe fitting 100 to slide into are respectively provided on the two opposite walls of the two positioning seats. Under the push of the corresponding loading mechanism 60, the two ends of the metal pipe fitting 100 can be placed in the positioning grooves of the two positioning seats, and the two ends of the metal pipe fitting 100 can be automatically clamped by the elastic mechanism 30 correspondingly arranged in the positioning grooves. Similarly, when withdrawing the material, under the push of the corresponding unloading mechanism 70, the metal pipe can be removed from the positioning grooves of the two positioning seats. This clamping structure greatly facilitates the loading and unloading process of the punching processing of the metal pipe fitting 100 and improves the punching processing efficiency. Secondly, when the metal pipe 100 to be processed clamped on the clamping seat assembly is pushed to the processing area 101 located on the front side of the workbench 10, the first through hole 210 on the first positioning seat 21 of the clamping seat assembly can be used for the core rod 44 correspondingly cantilevered in the processing area 101 of the workbench 10 to pass through, so that the core rod 44 extends into the corresponding metal pipe 100, and the metal pipe 100 sleeved on the core rod 44 is punched by the punching mechanism 400. This structural setting greatly facilitates the rapid sleeve connection of the metal pipe onto the core rod and After the processing is completed, it is removed from the core rod, thereby improving the punching processing efficiency of the metal pipe fitting 100; furthermore, when the waste pushing mechanism is performing the waste pushing operation, the first through hole 210 of the first positioning seat 21 can still be sleeved on the core rod 44 to limit the free end of the core rod 44. Since both ends of the core rod 44 are limited, the core rod 44 is not easy to bend during the process of ejecting the waste remaining in the core mold through the waste pushing needle 510 of the waste discharge mechanism 500, thereby ensuring the accuracy of the punching processing of the metal pipe fitting 100.

Claims

1. A loading and unloading device for an automatic punching device for metal pipe fittings, characterized in that include: A workbench (10) is provided with a processing area (101) located at the front side for punching the metal pipe (100) and a loading and unloading area (102) located at the rear side; The clamping and pushing mechanism (20) comprises a clamping seat assembly for clamping the two ends of a metal pipe (100) and a pushing driving member (23) for driving the clamping seat assembly to reciprocate between a processing area (101) and a loading and unloading area (102) of a workbench (10). The clamping seat assembly comprises a first positioning seat (21) and a second positioning seat (22) arranged at intervals in the front-rear direction of the workbench (10). The first positioning seat (21) is closer to the processing area (101) of the workbench (10) than the second positioning seat (22). The first positioning seat (21) is provided with a first through hole (210) which penetrates front and back and is coaxially arranged with the metal pipe (100) clamped between the first positioning seat (21) and the second positioning seat (22), so that a core rod (44) cantilevered in the processing area (101) of the workbench (10) can pass through the first through hole (210) and extend into the corresponding metal pipe (100), and when the waste discharge mechanism (500) performs a waste pushing action, the first through hole (210) can be sleeved on the core rod (44) to limit the core rod (44).

2. The loading and unloading device of the metal pipe automatic punching device according to claim 1 is characterized in that: The free end of the core rod (44) is gradually reduced in size so as to guide the free end of the core rod (44) to be inserted into the first through hole (210) of the first positioning seat (21).

3. The loading and unloading device of the metal pipe automatic punching device according to claim 1 or 2, characterized in that: The first positioning seat (21) is provided with a first positioning groove (211) for the first end of the metal pipe (100) to slide into and also to escape from, the first positioning groove (211) having the same direction as the first through hole (210) and being connected to the first through hole (210); the second positioning seat (22) is provided with a second positioning groove (221) for the second end of the metal pipe (100) to slide into and also to escape from, the second positioning groove (221) being arranged in the same direction as the first positioning groove (211) and being at the same height position, the first positioning groove and the second positioning groove (221) together forming a clamping opening for receiving the metal pipe.

4. The loading and unloading device of the metal pipe automatic punching device according to claim 3 is characterized in that: The width of the first positioning groove (211) is matched to the outer diameter of the metal pipe (100); the first through hole (210) is a cylindrical hole; and the peripheral edge of the rear end of the first through hole (210) abuts against the end of the metal pipe.

5. The loading and unloading device of the metal pipe automatic punching device according to claim 3 is characterized in that: The second positioning seat (22) is provided with an elastic mechanism (30) capable of acting on the end of the metal pipe (100) to axially clamp the metal pipe (100) between the first positioning seat (21) and the second positioning seat, and the elastic mechanism is provided with the second positioning groove (221).

6. The loading and unloading device of the metal pipe automatic punching device according to claim 5 is characterized in that The elastic mechanism (30) comprises: A movable block (31) is movably arranged on the second positioning seat (22) in a forward and backward manner relative to the second positioning seat (22), and a guide groove is provided on the side wall of the movable block (31) for the corresponding end of the metal pipe (100) to slide into, and the guide groove constitutes a second positioning groove (221) of the second positioning seat (22); The elastic member (32) acts on the movable block (31), so that the movable block (31) always has a tendency to move away from the second positioning seat (22) in the front-rear direction of the workbench (10), so that the movable block (31) abuts against the corresponding end position of the metal pipe (100).

7. The loading and unloading device of the automatic punching device for metal pipes according to claim 6 is characterized in that: The guide groove of the movable block (31) comprises an entrance portion (301) and a receiving portion (302); the bottom surface of the entrance portion (301) of the guide groove is a guide arc surface / guide inclined surface (310) for guiding the metal pipe to enter the receiving portion (302); when the elastic mechanism is in a free state, a first axial distance (L1) between the entrance portion (301) of the guide groove and another positioning groove is greater than a length (d) of the metal pipe, and a second axial distance (L2) between the receiving portion (302) of the movable block (31) and another positioning groove is less than the length (d) of the metal pipe.

8. The loading and unloading device of the metal pipe automatic punching device according to claim 4 is characterized in that: The machine tool further comprises a loading mechanism (60) and a unloading mechanism (70) which are arranged in the loading and unloading area (102) of the workbench (10); the loading mechanism (60) and the unloading mechanism (70) are respectively located on the left and right sides of the clamping and pushing mechanism (20); the loading mechanism (60) is arranged on the side of the workbench (10) facing the opening of the first positioning groove, and is used to transport and clamp the metal pipe (100) to be processed between the first positioning seat (21) and the second positioning seat (22) of the clamping seat assembly; the unloading mechanism (70) is arranged on the side of the workbench (10) away from the opening of the first positioning groove, and is used to remove the processed metal pipe (100) from between the first positioning seat (21) and the second positioning seat (22) of the clamping seat assembly.

9. The loading and unloading device of the metal pipe automatic punching device according to claim 8 is characterized in that The feeding mechanism (60) comprises: A workpiece lifting assembly (61) comprises a feed rack (62), a lifting drive member (63) and a workpiece bracket (64), wherein the feed rack (62) is tilted so that the metal pipe (100) to be processed can be automatically moved to the workpiece bracket (64) corresponding to the low position of the feed rack (62), and the workpiece bracket (64) is connected to the action end of the lifting drive member and moves up and down reciprocatingly with the action end of the lifting drive member; A loading clamp (65) for clamping the metal pipe (100) to be processed lifted up by the workpiece bracket (64) and releasing the metal pipe (100); A feeding drive member (66) has an active end connected to the feeding clamp (65) and is used to drive the metal pipe (100) clamped by the feeding clamp (65) to move toward the clamping seat assembly so that the two ends of the metal pipe (100) are clamped into the clamping seat assembly.

10. The loading and unloading device of the metal pipe automatic punching device according to claim 8, characterized in that The unloading mechanism (70) comprises: A material unloading driving member (71), the active end of which is connected to a material pushing block (72), for driving the material pushing block (72) to move toward the clamping seat assembly to push the metal pipe (100) processed on the clamping seat assembly out of the clamping seat assembly; The unloading rack (73) is arranged to be inclined from top to bottom, and the feeding port at the upper end is connected to the bottom of the loading and unloading area (102) of the workbench (10), and corresponds to the unloading port correspondingly arranged on the workbench (10) and located below the clamping seat assembly in the upper and lower directions, and the discharging port at the lower end extends to the outside of the workbench (10).

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