CN208132344U - A kind of automatic assembling connecting pipe fitting - Google Patents

Abstract

The utility model relates to an automatic assembly machine for connecting pipe joints, which includes a frame and a power distribution control box. The frame is provided with a feeding mechanism and a conveying mechanism, and the front side of the conveying mechanism is provided with an assembly mechanism on the frame. The feeding mechanism includes the lower end cover feeding device, the central tube feeding device and the upper end cover feeding device arranged on the frame along the rear side of the conveying mechanism in sequence, and the lower end cover feeding device, the central tube feeding device and the upper end cover The feeding device is equipped with a lower end cover vibrating plate, a central tube vibrating plate and an upper end cover vibrating plate respectively. The right side of the conveying mechanism is provided with a conveying mechanism on the frame, and the lower part of the conveying mechanism is provided with a detection mechanism at the right end of the conveying mechanism; The plate cooperates with the feeding device to realize the automatic feeding of the three parts, and then the assembly is completed at one time by the assembly mechanism, and finally the length of the product is automatically detected by the detection mechanism to ensure product quality, and the material is automatically unloaded by the handling mechanism to realize automatic production. , improving production efficiency.

Description

An automatic assembly machine for connecting pipe joints

technical field

The invention relates to automatic assembly equipment, in particular to an automatic assembly machine for connecting pipe joints.

Background technique

The structure of a connecting pipe joint is shown in Figure 9. It includes a central tube 67, and the two ends of the central tube 67 are fastened with an upper end cover 68 and a lower end cover 66. The existing assembly method basically relies on manual work. The size of the strength is different when the buckle is different, and the tightness of the fastening is different, resulting in inconsistent product length after assembly, it is difficult to guarantee product quality, and the production efficiency is low.

Contents of the invention

The purpose of the present invention is to provide an automatic assembly machine for connecting pipe joints, which realizes the automatic feeding of three parts through the vibrating plate and the feeding device, and automatically transports the parts through the conveying mechanism, and then completes the one-time assembly through the assembling mechanism. Finally, the length of the product is automatically detected by the detection mechanism to ensure product quality, and the material is automatically unloaded by the handling mechanism, so that automatic production can be realized conveniently and quickly, and the production efficiency is improved.

In order to achieve the above objectives, the technical solution adopted by the present invention is: an automatic assembly machine for connecting pipe joints, which includes a frame and a power distribution control box, and the frame is provided with a feeding mechanism and a conveying mechanism that cooperate with each other. The front side of the conveying mechanism is provided with an assembly mechanism on the frame, and the feeding mechanism includes a lower end cover feeding device, a central tube feeding device and an upper end cover feeding device which are sequentially arranged on the frame along the rear side of the conveying mechanism. device, and the lower end cover feeding device, the central tube feeding device and the upper end cover feeding device are respectively equipped with a lower end cover vibrating plate, a central tube vibrating plate and an upper end cover vibrating plate, and the right side of the conveying mechanism is set on the frame There is a conveying mechanism, a detecting mechanism is arranged under the conveying mechanism at the right end of the conveying mechanism, and a receiving box is arranged on the frame on the right side of the detecting mechanism.

Further, the conveying mechanism includes a front circulation bottom plate and a rear circulation bottom plate arranged side by side on the frame along the X-axis direction, and a recovery conveyor belt is arranged on the rear circulation bottom plate along the X-axis direction, and the recovery conveyor belt is connected to the machine frame. The conveying motor on the frame cooperates, and the recovery conveyor belt forms a "back"-shaped conveying track with the conveying chute set on the upper surface of the front circulation floor. A workpiece is vertically placed on the clamping jig. The left end of the front circulation bottom plate is provided with a rightward propulsion device matched with the conveying chute along the X-axis conveying direction, and a rightward propulsion device matched with the conveying chute is provided at the right end along the Y-axis direction. The rear propulsion device, the left end of the rear circulation bottom plate is provided with a forward propulsion device matched with the conveying chute along the Y-axis direction, and the conveying motor is electrically connected with the power distribution control box.

Further, the rightward propulsion device, the backward propulsion device and the forward propulsion device all include a propulsion bracket arranged on the frame, and a propulsion cylinder is arranged on the propulsion support, and the output end of the propulsion cylinder is connected with a propulsion A connecting shaft, the pushing connecting shaft is interspersed with a pushing block matched with the side of the clamping jig, the pushing block is connected with a pushing guide rod slidingly matched with the pushing bracket, and the pushing cylinder is electrically connected to the power distribution control box. sexual connection.

Further, the assembly mechanism includes a pressing bracket arranged on the frame, and on the pressing bracket, a pilot cylinder is arranged horizontally and backward above the front circulation bottom plate, and the output end of the pilot cylinder is connected with a pressure Tighten the guiding block, the rear end of the pressing and guiding block is provided with a guiding groove matching with the workpiece, and the bottom of the pressing and guiding block is slidably matched with the guiding slide seat arranged on the pressing bracket, the The left side of the guide slide seat is provided with a positioning baffle on the frame to cooperate with the pressing guide block, and the upper end of the pressing bracket is vertically downwardly provided with a pressing cylinder, and the output end of the pressing cylinder is connected to There is a pressing lifting block aligned with the clamping jig, and the pressing lifting block is slidably matched with the upper and lower rails vertically arranged on the pressing bracket, and the lower end of the pressing lifting block is provided with a pressing plate aligned with the workpiece. head, the pilot cylinder and the compression cylinder are electrically connected to the power distribution control box.

Further, the lower end cover feeding device, the central tube feeding device and the upper end cover feeding device all include a feeding bracket, and a translation cylinder is horizontally arranged on the feeding bracket, and the output end of the translation cylinder is connected with a translation The sliding seat, the left side of the translation sliding seat is provided with a positioning sensor on the feeding bracket, and the translation sliding seat is slidably matched with the translation slide rail arranged on the feeding bracket, and the translation sliding seat is vertically provided with a material taking Lifting cylinder, the output end of the lifting cylinder is connected with a lifting seat slidingly matched with the translation slide, and the lifting seat is provided with a pneumatic gripper that cooperates with the distributing device. The translational cylinder, The positioning sensor, material lifting cylinder and pneumatic gripper are all electrically connected with the power distribution control box.

Further, the material distributing device includes a material distributing bracket and a feeding track arranged on the frame, a material distributing block is arranged on the material distributing bracket, and a material distributing groove communicated with the feeding track is opened on the material distributing block .

Further, the conveying mechanism includes a conveying lifting cylinder vertically arranged on the frame, the left and right sides of the conveying lifting cylinder are provided with linear bearings on the frame, and the output end of the conveying lifting cylinder is connected with a conveying Lifting pallet, the bottom of the lifting pallet is connected with a conveying guide rod matched with a linear bearing sleeve, the upper part of the lifting pallet is provided with a front and rear cylinder, and the output end of the cylinder is connected with a front and rear pallet , the upper part of the front and rear supporting plates is provided with the left and right conveying cylinders, the output ends of the left and right conveying cylinders are connected with the conveying claw fixing plate, and the upper part of the conveying claw fixing plate is evenly arranged with four sets of conveying claws, and The moving claw fixing plate is provided with a carrying pressure plate directly above the moving claw, and the lifting and lowering cylinders, the front and rear cylinders, the left and right cylinders, and the moving claws are all electrically connected to the power distribution control box.

Further, the detection mechanism includes a positioning device arranged at the right end of the conveying mechanism, and the positioning device includes a positioning bracket arranged on the frame, and an upper cylinder is vertically arranged on the positioning bracket, and the upper cylinder The output end is connected with a lower wedge-shaped top block, the upper end of the positioning bracket is fixed with a constant pressure block, and a guide connecting rod is movably interspersed on the constant pressure block, and the left end of the guide rod is connected with a fixed pressure block. The right end of the dynamic pressure block is connected with an upper wedge-shaped pressure block that matches the lower wedge-shaped top block, and a return spring is set on the right side of the fixed pressure block on the guide connecting rod, and the part where the dynamic pressure block and the fixed pressure block cooperate is embedded A protective clip matching with the workpiece is provided, and the upper top cylinder is electrically connected with the power distribution control box.

The beneficial effects of the present invention are:

1. The automatic feeding of the three parts is realized through the vibrating plate and the feeding device, and the parts are automatically conveyed through the conveying mechanism, and then assembled at one time through the assembly mechanism, and finally the length of the product is automatically detected by the detection mechanism to ensure product quality. , and the material is automatically unloaded by the handling mechanism, so that the automatic production can be realized conveniently and quickly, and the production efficiency can be improved.

2. The design of the conveying mechanism, the clamping fixture is conveyed through the rightward propulsion device, and the backward and forward propulsion device plays the role of circular conveyance, and the recovery of the conveyor belt can speed up the reset of the clamping fixture , Save time for clamping fixtures.

3. The design of the assembly mechanism pushes and compresses the guide block through the guide cylinder to cooperate with the positioning baffle, so that the guide groove guides the workpiece to ensure that the workpiece remains vertical.

4. The design of three sets of feeding devices adopts the vibrating plate to feed the material, and then the workpiece is clamped by the pneumatic gripper. The positioning sensor controls the movement distance of the translation cylinder, and the workpiece is accurately translated to the clamping fixture, and the material is automatically loaded. , which is conducive to improving production efficiency.

5. The design of the distributing device is to feed the material from the feeding track to the distributing trough on the distributing block to ensure that the workpiece maintains the posture when it needs to be assembled, which is convenient for subsequent retrieving and assembling.

6. The design of the handling mechanism, the assembled workpiece is picked up by four sets of moving claws, and the upper end of the workpiece is pressed by the moving pressure plate to ensure that the moving claws clamp the same part of the workpiece, which is convenient for subsequent inspection work.

Description of drawings

Fig. 1 is a structural schematic diagram of an automatic assembly machine for connecting pipe joints.

Fig. 2 is a structural schematic diagram of the conveying mechanism.

Fig. 3 is a structural schematic diagram of the forward propulsion device.

Fig. 4 is a structural schematic diagram of the assembly mechanism.

Fig. 5 is a schematic structural view of the lower end cover feeding device.

Fig. 6 is a structural schematic diagram of a material distribution device.

Fig. 7 is a structural schematic diagram of the transport mechanism.

Fig. 8 is a structural schematic diagram of the positioning device.

Figure 9 is a schematic structural view of the product.

The characters shown in the figure are marked as: 1. Rack; 2. Conveyor mechanism; 3. Assembly mechanism; 4. Transport mechanism; 5. Detection mechanism; Center tube feeding device; 9. Bottom cover vibrating plate; 10. Lower end cover feeding device; 11. Center tube vibrating plate; 12. Upper end cover vibrating plate; 13. Rightward propulsion device; 14. Work piece; Bottom plate; 16. Clamping jig; 17. Backward propulsion device; 18. Forward propulsion device; 19. Back circulation bottom plate; 20. Conveying motor; 21. Recycling conveyor belt; 22. Propelling bracket; 24. Push block; 25. Propel cylinder; 26. Propel guide rod; 27. Feeding bracket; 28. Pneumatic gripper; Material lifting cylinder; 33, translational sliding seat; 34, translational cylinder; 35, material distribution bracket; 36, material distribution block; 37, material distribution trough; 38, feeding track; 39, pressing lifting block; 40, pressing head ;41, guiding groove; 42, pressing cylinder; 43, upper and lower rails; 44, guiding cylinder; 45, pressing bracket; 46, pressing guiding block; 47, guiding slide seat; Pallet; 49, transport guide rod; 50, transport lift cylinder; 51, transport front and rear cylinders; 52, front and rear support plates; 53, transport left and right cylinders; 54, transport claw fixed plate; 55, linear bearing; ; 57, moving claw; 58, dynamic pressure block; 59, fixed pressure block; 60, positioning bracket; 61, protective clamp block; 62, guide connecting rod; 63, upper wedge-shaped pressure block; 65, top cylinder.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention. .

As shown in Figures 1-9, the structure of the present invention is: an automatic assembly machine for connecting pipe joints, which includes a frame 1 and a power distribution control box, and the frame 1 is provided with a feeding mechanism that cooperates with each other And conveying mechanism 2, the front side of described conveying mechanism is provided with assembly mechanism 3 on frame 1, and described feeding mechanism comprises the lower end cover feeding device 10 that is arranged on frame 1 successively along conveying mechanism 2 rear sides, The central tube feeding device 8 and the upper end cover feeding device 7, and the lower end cover feeding device 10, the central tube feeding device 8 and the upper end cover feeding device 7 are respectively equipped with an upper end cover vibrating plate 9, a central tube vibrating plate 11 and The lower end cover vibrating plate 12, the right side of the conveying mechanism 2 is provided with a conveying mechanism 4 on the frame 1, the bottom of the conveying mechanism 4 is provided with a detection mechanism 5 at the right end of the conveying mechanism 2, the detection mechanism 5 The right side is provided with receiving box 6 on frame 1.

Preferably, the conveying mechanism 2 includes a front circulation bottom plate 15 and a rear circulation bottom plate 19 arranged side by side on the frame 1 along the X-axis direction, and a recycling conveyor belt 21 is arranged on the rear circulation bottom plate 19 along the X-axis direction, and the Recycling conveyor belt 21 cooperates with the delivery motor 20 arranged on the frame 1, and recycling conveyor belt 21 forms a "back"-shaped delivery track with the delivery chute provided on the upper surface of the front circulation base plate 15, and the delivery chute and recovery delivery belt 21 is slidably fitted with a clamping jig 16, on which a workpiece 14 is placed vertically, and the left end of the front circulation bottom plate 15 is provided with a rightward pusher that cooperates with the conveying chute along the X-axis conveying direction. The right end of the device 13 is provided with a backward propulsion device 17 cooperating with the conveying chute along the Y-axis direction, and the left end of the rear circulation bottom plate 19 is provided with a forward propelling device 18 cooperating with the conveying chute along the Y-axis direction. The conveying motor 20 is electrically connected with the power distribution control box.

Preferably, the rightward propulsion device 13, the backward propulsion device 17 and the forward propulsion device 18 all include a propulsion bracket 22 arranged on the frame 1, and the propulsion bracket 22 is provided with a propulsion cylinder 25, and the propulsion The output end of the cylinder 25 is connected with a propulsion connection shaft 23, which is interspersed with a push block 24 that cooperates with the side of the clamping jig 16, and is connected with a push block 24 that is slidably matched with the propulsion bracket 22. Propelling the guide rod 26, the propelling cylinder 25 is electrically connected with the power distribution control box.

Preferably, the assembly mechanism 3 includes a pressing bracket 45 arranged on the frame 1, and the pressing bracket 45 is provided with a pilot cylinder 44 horizontally above the front circulation bottom plate 15, and the pilot cylinder 44 The output end of 44 is connected with a compression guide block 46, and the rear end of the compression guide block 46 is provided with a guide groove 41 that cooperates with the workpiece, and the bottom of the compression guide block 46 is arranged on the compression bracket The guide slide 47 on the 45 is slidably matched, and the left side of the guide slide 47 is provided with a positioning baffle that cooperates with the pressing guide block 46 on the frame 1, and the upper end of the press support 45 is vertical A compression cylinder 42 is arranged downwards, and the output end of the compression cylinder 42 is connected with a compression lifting block 39 aligned with the clamping fixture 16, and the compression lifting block 39 is vertically arranged on the compression support 45. The upper and lower slide rails 43 are slidingly fitted, and the lower end of the pressing lifting block 39 is provided with a pressing head 40 aligned with the workpiece 14, and the guiding cylinder 44 and the pressing cylinder 42 are electrically connected to the power distribution control box.

Preferably, the lower end cover feeding device 10, the central tube feeding device 8 and the upper end cover feeding device 7 all include a feeding bracket 27, and a translation cylinder 34 is horizontally arranged on the feeding bracket 27, and the translation cylinder The output end of 34 is connected with translation sliding seat 33, and the left side of described translation sliding seat 33 is provided with positioning sensor 31 on the feeding support 27, and translation sliding seat 33 is arranged on the translation slide rail 30 on the feeding support 27 Sliding fit, and vertically provided with the lifting cylinder 32 on the translation slide 33, the output end of the lifting cylinder 32 is connected with the lifting seat 29 slidingly matched with the translation slide 33, the lift The seat 29 is provided with a pneumatic gripper 28 that cooperates with the material distribution device. The translation cylinder 34, the positioning sensor 31, the lifting cylinder 32 and the pneumatic gripper 28 are all electrically connected to the power distribution control box.

Preferably, the distributing device includes a distributing bracket 35 and a feeding track 38 arranged on the frame 1, the distributing bracket 35 is provided with a distributing block 36, and the distributing block 36 is provided with a feeding The distribution tank 37 that the track 38 communicates with.

Preferably, the conveying mechanism 4 includes a conveying lifting cylinder 50 arranged vertically upwards on the frame 1, the left and right sides of the conveying lifting cylinder 50 are provided with linear bearings 55 on the frame 1, and the conveying lifting cylinder The output end of the 50 is connected with a transport lift pallet 48, the bottom of the transport lift pallet 48 is connected with a transport guide rod 49 that is fitted with a linear bearing 55 sleeve, and the top of the transport lift pallet 48 is provided with a front and rear cylinder 51, The output ends of the front and rear air cylinders 51 are connected with the front and rear supporting plates 52, and the upper parts of the front and rear supporting plates 52 are provided with the left and right air cylinders 53, and the output ends of the left and right air cylinders 53 are connected with the moving pawl fixed plates 54. The upper part of the moving claw fixing plate 54 is evenly arranged with four sets of moving claws 57, and the moving claw fixing plate 54 is provided with a carrying pressure plate 56 directly above the moving claws 57. The lifting cylinder 50, the moving Front and rear cylinders 51, carrying left and right cylinders 53, and carrying claws 57 are all electrically connected with the power distribution control box.

Preferably, the detection mechanism 5 includes a positioning device arranged on the right end of the conveying mechanism 2, the positioning device includes a positioning bracket 60 arranged on the frame 1, and an upper cylinder 65 is vertically arranged on the positioning bracket 60, The output end of the upper top cylinder 65 is connected with a lower wedge-shaped top block 64, and the upper end of the positioning bracket 60 is fixedly provided with a constant pressure block 59, and a guide connecting rod 62 is movably interspersed on the constant pressure block 59. The left end of the connecting rod 62 is connected with the dynamic pressure block 58 which cooperates with the constant pressure block 59, the right end is connected with the upper wedge-shaped pressure block 63 which cooperates with the lower wedge-shaped top block 64, and the guide connecting rod 62 is on the right side of the constant pressure block 59 A reset spring is sleeved, and a protective clip 61 matching with the workpiece 14 is embedded in the matching part of the dynamic pressure block 58 and the fixed pressure block 59, and the upper top cylinder 65 is electrically connected with the power distribution control box.

In specific use, first set the control program of the equipment, then turn on the power switch of the equipment, then start the lower end cover vibrating plate 9, the central tube vibrating plate 11, and the upper end cover vibrating plate 12 in sequence, and vibrate and feed each accessory to the distribution device for distribution. In the trough 37, the upper end cover feeding device 10, the central tube feeding device 8, and the upper end cover feeding device 7 start to move at the same time, and the feeding lifting seat 29 is lowered by the feeding lifting cylinder 32, and then the pneumatic gripper 28 grips The workpiece is then driven by the translation cylinder 34 to translate to the top of the clamping fixture 16, and the precise positioning is realized by the positioning sensor 31 to ensure that the workpiece is aligned with the clamping fixture 16, and then the forward propulsion device 18 in the conveying mechanism 2, The rightward propulsion device 13 and the backward propulsion device 17 act, and push the push block 24 along the conveying direction through the propulsion cylinder 25, and the push block 24 transports the clamping jig 16 loaded with accessories to the bottom of the assembly mechanism 3, and then the conveying motor 20 drives The recovery conveyor belt 21 circulates the clamping jig 16 in the conveying track, and when the workpiece 14 is conveyed to the bottom of the assembly mechanism 3, the pilot cylinder 44 pushes and compresses the pilot block 46 backwards, clamps the workpiece 14 through the pilot groove 41 and Compress until the positive block 46 cooperates with the guide baffle to ensure that the workpiece is always in a vertical state, and then the compression cylinder 42 pushes down the compression lifting block 39, so that the compression head 40 can compress and assemble the workpiece at one time, which is easy to operate , and ensure the uniform size of the product, the assembled product is under the action of the conveying mechanism 4, clamps the workpiece by the conveying claw 57, and the upper end of the workpiece is supported by the conveying platen 56, and the workpiece is lifted by the conveying lifting cylinder 50, and then conveyed The left and right cylinders 53 move the workpiece to the positioning device, and at the same time, the upper cylinder 65 lifts the lower wedge-shaped top block 64 upwards, pushes the upper wedge-shaped pressure block 63 to the left, and pushes the dynamic pressure plate 58, so that the workpiece is placed in the protective clamp block 61 , and then continue to translate the workpiece to the top of the receiving box 6 by the left and right air cylinders 53, and the conveying claws 57 unclamp the workpiece.

It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation of the present invention. It should be pointed out that , due to the limitation of written expression, there are objectively unlimited specific structures. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements, modifications or changes can also be made. The above-mentioned technical features can be combined in an appropriate manner; these improvements, changes or combinations, or direct application of the inventive idea and technical solution to other occasions without improvement should be regarded as the protection scope of the present invention.

Claims (8)

1. An automatic assembly machine for connecting pipe joints, which includes a frame (1) and a power distribution control box, characterized in that: the frame (1) is provided with a feeding mechanism and a conveying mechanism (2 ), the front side of the conveying mechanism is provided with an assembly mechanism (3) on the frame (1), and the feeding mechanism includes lower end covers which are sequentially arranged on the frame (1) along the rear side of the conveying mechanism (2) Feeding device (10), central tube feeding device (8) and upper end cover feeding device (7), and lower end cover feeding device (10), central tube feeding device (8) and upper end cover feeding device ( 7) The lower end cover vibrating plate (12), the central tube vibrating plate (11) and the upper end cover vibrating plate (9) are equipped respectively, and the right side of the conveying mechanism (2) is provided with a transport mechanism on the frame (1) (4), a detection mechanism (5) is provided below the conveying mechanism (4) at the right end of the conveying mechanism (2), and a receiving mechanism (5) is provided on the right side of the detection mechanism (5) on the frame (1). boxes (6). 2. An automatic assembly machine for connecting pipe joints according to claim 1, characterized in that: the conveying mechanism (2) includes front circulation bottom plates (15) arranged side by side on the frame (1) along the X-axis direction ) and the rear circulation bottom plate (19), the recovery conveyor belt (21) is arranged along the X-axis direction on the rear circulation bottom plate (19), and the recovery conveyor belt (21) is connected with the conveying motor ( 20) Cooperate, and the recycling conveyor belt (21) forms a "back"-shaped conveyor track with the conveying chute set on the upper surface of the front circulation floor (15), and the conveying chute and the recycling conveyor belt (21) slide and fit with clips A holding jig (16), on which a workpiece (14) is vertically placed, and the left end of the front circulation bottom plate (15) is provided with a direction that matches the conveying chute along the X-axis conveying direction. The right propulsion device (13), the right end is provided with the backward propulsion device (17) which cooperates with the conveying chute along the Y-axis direction, and the left end of the said rear circulation bottom plate (19) is provided with a propelling device which cooperates with the conveying chute along the Y-axis direction. Propelling the device (18) forward, the conveying motor (20) is electrically connected to the power distribution control box. 3. An automatic assembly machine for connecting pipe joints according to claim 2, characterized in that: the rightward pushing device (13), the backward pushing device (17) and the forward pushing device (18) all include The propulsion bracket (22) arranged on the frame (1), the propulsion cylinder (25) is arranged on the propulsion bracket (22), the output end of the propulsion cylinder (25) is connected with a propulsion connection shaft (23), The pushing connecting shaft (23) is interspersed with a pushing block (24) that cooperates with the side of the clamping jig (16), and the pushing block (24) is connected with a pushing guide that slides and fits with the pushing bracket (22) rod (26), and the propulsion cylinder (25) is electrically connected with the power distribution control box. 4. An automatic assembly machine for connecting pipe joints according to claim 1, characterized in that: the assembly mechanism (3) includes a pressing bracket (45) arranged on the frame (1), and the pressing bracket (45) On the tight bracket (45), a pilot cylinder (44) is horizontally arranged on the top of the front circulation base plate (15), and the output end of the pilot cylinder (44) is connected with a compression pilot block (46). The rear end of the pressing and guiding block (46) is provided with a guiding groove (41) matched with the workpiece, and the bottom of the pressing and guiding block (46) is in contact with the guiding slide provided on the pressing bracket (45). The seat (47) is slidably fitted, and the left side of the guide slide (47) is provided with a positioning baffle on the frame (1) that is matched with the pressing guide block (46), and the pressing bracket (45 ) is provided with a compression cylinder (42) vertically downward, the output end of the compression cylinder (42) is connected with a compression lifting block (39) aligned with the clamping jig (16), the compression The lifting block (39) is slidably matched with the upper and lower rails (43) vertically arranged on the pressing bracket (45), and the lower end of the pressing lifting block (39) is provided with a pressing head ( 40), the guiding cylinder (44) and the pressing cylinder (42) are both electrically connected to the power distribution control box. 5. An automatic assembly machine for connecting pipe joints according to claim 1, characterized in that: the lower end cover feeding device (10), the central tube feeding device (8) and the upper end cover feeding device (7 ) all include a feeding bracket (27), and a translation cylinder (34) is horizontally arranged on the feeding bracket (27), and the output end of the translation cylinder (34) is connected with a translation slide seat (33), and the translation The left side of the sliding seat (33) is provided with a positioning sensor (31) on the feeding bracket (27), and the translation sliding seat (33) is slidingly matched with the translation sliding rail (30) arranged on the feeding bracket (27) , and the lifting cylinder (32) is vertically arranged on the translation slide (33), and the output end of the lifting cylinder (32) is connected with a lifting base ( 29), the lifting seat (29) is provided with a pneumatic gripper (28) that cooperates with the material distribution device, the translation cylinder (34), the positioning sensor (31), the lifting cylinder (32) and the pneumatic gripper (28) are electrically connected with the power distribution control box. 6. An automatic assembly machine for connecting pipe joints according to claim 5, characterized in that: the material distribution device includes a material distribution bracket (35) and a feeding track (38) arranged on the frame (1) , The material distribution bracket (35) is provided with a material distribution block (36), and the material distribution block (36) is provided with a material distribution groove (37) connected with the feeding track (38). 7. An automatic assembly machine for connecting pipe joints according to claim 1, characterized in that: the transport mechanism (4) includes a transport lift cylinder (50) vertically facing upwards on the frame (1) , the left and right sides of the lifting cylinder (50) are provided with linear bearings (55) on the frame (1), and the output end of the lifting cylinder (50) is connected with a lifting pallet (48), the The bottom of the transport lifting pallet (48) is connected with a transport guide rod (49) that is fitted with a linear bearing (55). The output end of the air cylinder (51) is connected with the front and rear pallets (52), and the upper part of the front and rear pallets (52) is provided with the left and right conveying cylinders (53), and the output ends of the conveying left and right cylinders (53) are connected with conveying air Claw fixing plate (54), four groups of moving claws (57) are evenly arranged on the upper part of the moving claw fixing plate (54), and the moving claw fixing plate (54) is on the upper part of the moving claw (57) A transport pressing plate (56) is arranged directly above, and the transport lift cylinder (50), transport front and rear cylinders (51), transport left and right cylinders (53), and transport claws (57) are all electrically connected to the power distribution control box. 8. An automatic assembly machine for connecting pipe joints according to claim 1, characterized in that: the detection mechanism (5) includes a positioning device arranged at the right end of the conveying mechanism (2), and the positioning device includes a The positioning bracket (60) on the frame (1), the upper cylinder (65) is vertically arranged on the positioning bracket (60), and the output end of the upper cylinder (65) is connected with a lower wedge-shaped top block (64), the upper end of the positioning bracket (60) is fixedly provided with a fixed pressure block (59), the fixed pressure block (59) is movably interspersed with a guide link (62), and the guide link (62) The left end is connected with the dynamic pressure block (58) matched with the fixed pressure block (59), the right end is connected with the upper wedge-shaped pressure block (63) matched with the lower wedge-shaped top block (64), and the guide link (62) is on the fixed The right side of the pressure block (59) is covered with a return spring, and the part where the dynamic pressure block (58) and the fixed pressure block (59) cooperate is embedded with a protective clamp (61) that cooperates with the workpiece (14). The top cylinder (65) is electrically connected with the power distribution control box.