Automatic fastening machine and fastening method thereof

Abstract

The present invention discloses an automatic fastening machine and a fastening method thereof, comprising a control cabinet, a workpiece conveying device, an auxiliary pressure device, a fastener feeding device, a fastening device, and a machine head sliding device. A PLC controller is arranged in the control cabinet and is electrically connected to other devices respectively. A control panel is arranged on the front. A pair of the workpiece conveying devices are longitudinally and parallelly fixedly mounted on the control cabinet. The auxiliary pressure device is vertically erected on the front end of the top surface of the control cabinet. The fastener feeding device is arranged between a pair of workpiece conveying devices and is installed on the control cabinet. The fastening device is vertically arranged above the fastener feeding device and is horizontally slidably connected to the machine head sliding device. The machine head sliding device is vertically installed at the rear end of the control cabinet. The present invention adopts single-machine double-line overlap fastening, single-line diagonal fastening and PLC control technology to improve the fastening efficiency and quality of the air outlet pipe.

Description

Technical Field

[0001] The invention relates to the technical field of fastening machines, and in particular to an automatic fastening machine and a fastening method thereof. Background Art

[0002] The existing diaphragm gas meter movement generally includes a diaphragm box, a valve seat, a central axis, a valve cover, a crank gear, a light spring, a rocker arm, a rotating shaft, a pulling arm, a connecting plate, an outlet pipe, an outlet pipe sealing ring, a side cover, and a diaphragm. The outlet pipe is fixed by ultrasonic welding or a fastening buckle process. The outlet pipe is first manually placed on the rotating shaft pressure cover of the movement, and the corresponding hole positions are matched. Then it is placed on an ultrasonic welding device or tooling for ultrasonic welding or fastening buckle pressing. The filling of the fastening buckle requires manual operation, and the process is complicated and the labor efficiency is low. In addition, the fastening device has low precision, and the fastening buckle pressing also relies on manual operation, which requires high skills of the operator. If you are not careful, it is easy to damage the rotating shaft pressure cover and the outlet pipe due to the large buckling pressure, or due to uneven pressing, it is easy to cause gas leakage and cause safety accidents. Therefore, it is necessary to develop an automatic fastening machine and a fastening method thereof to further improve the efficiency and quality of the outlet pipe fastening and ensure the quality and safety of the gas meter. Summary of the invention

[0003] The object of the present invention is to provide an automatic fastening machine and a fastening method thereof to solve the problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic fastening machine includes a control cabinet, a workpiece conveying device, an auxiliary pressure device, a fastener feeding device, a fastening device, and a head sliding device, characterized in that: a PLC controller is arranged in the control cabinet, which is electrically connected to other devices respectively, and a control panel is arranged on the front. A pair of the workpiece conveying devices are longitudinally and parallelly fixedly mounted on the control cabinet, the auxiliary pressure device is vertically erected on the front end of the top of the control cabinet, the fastener feeding device is arranged between a pair of workpiece conveying devices, and is installed on the control cabinet for placing fasteners, the fastening device is vertically arranged above the fastener feeding device, and is horizontally slidably connected to the head sliding device, and the head sliding device is vertically installed at the rear end of the control cabinet.

[0005] The workpiece conveying device includes a first synchronous belt linear guide module, a first slide, a mold frame mounting plate, and a mold frame. The first synchronous belt linear guide module is equipped with a first seat, a first linear guide, a first ball slider, a first stepper motor, and a first synchronous belt. It is a prior art and will not be described in detail. It is used for reciprocating conveying of workpieces. The mold frame mounting plate is fixedly connected to the first slide seat. The mold frame is U-shaped with an opening facing outward and is fixedly connected to the mold frame mounting plate for clamping and fixing the workpiece. When loading and unloading the workpiece, the mold frame is located directly below the auxiliary pressure device.

[0006] The auxiliary pressure device includes a door frame, a weight frame, a cylinder, and a weight. The door frame includes a column and a cylinder mounting plate. A pair of the columns are respectively vertically fixedly installed on the inner edges of both sides of the front end of the control cabinet. The cylinder mounting plate is fixedly installed on a pair of columns. A pair of weight frames are arranged in parallel directly below the cylinder mounting plate and movably penetrate the cylinder mounting plate, including guide columns, slot plates, pillars, and slot plates. Two pairs of the guide columns are respectively spaced apart and vertically penetrate the cylinder mounting plate. A pair of slot plates are respectively fixedly connected to the lower ends of the corresponding pair of guide columns, and are both directly below the cylinder mounting plate. The two pairs of pillars are respectively spaced apart and vertically downwardly installed on the bottom surfaces of the corresponding slot plates. A pair of slot plates are horizontally fixedly installed on the corresponding A pair of lower ends of the pillars are provided with U-shaped slots with openings facing the machine head sliding device. A pair of the cylinders are respectively vertically mounted on the cylinder mounting plates, and the output ends movably penetrate the cylinder mounting plates and are fixedly connected to the corresponding slot plates. A pair of weights are suspended on the corresponding slot plates via the U-shaped slots. By setting an auxiliary pressure device, when the workpiece is installed on the mold frame, the cylinder drives the weight rack to place the weight completely on the workpiece and release the suspension from the slot plate. At this time, the weight rack is in a stationary state, and then the first synchronous belt linear guide module transports the workpiece to the bottom of the fastening device and places the weight on the top surface of the workpiece, which can prevent the workpiece from being deflected due to force during the subsequent fastening of the fasteners, thereby affecting the subsequent fastening of the fasteners.

[0007] The fastening device includes a protective cover, a base plate, a second synchronous belt linear guide module, a fastening machine fixed seat, a fastening head guide, a fastening machine, and a fastening head. The base plate is vertically arranged above the fastener feeding device, and the top end extends into the protective cover. The second synchronous belt linear guide module is longitudinally arranged in the protective cover and fixedly installed on the front side of the base plate. A second slide seat, a second linear guide, a second ball slider, a second stepping motor, and a second synchronous belt are arranged therein. They are prior art and will not be described in detail. They are used to gradually feed the fastening head that receives the fastener into the fastener mounting hole of the workpiece. After the fastening of the fastener is completed, the fastening head is pulled out of the fastener mounting hole of the workpiece. The fastening machine fixed seat is fixedly installed horizontally and forwardly in the first At the lower end of the front face of the second slide seat, the fastening head guide is Z-shaped, the upper end is fixedly connected to the ball slider, and the lower end passes through the fastening machine fixed seat. When not in operation, it is located directly above the fastener feeding device (i.e., the initial position), matching the workpiece fastener mounting hole. The fastening machine is vertically fixed on the fastening machine fixed seat, and a fastening head is provided at the lower end. The fastening head is vertically downward and rollingly connected to the fastening head guide. By setting the fastening device, when the workpiece is transported into place, the second synchronous belt linear guide module drives the fastening machine to move downward toward the fastener feeding device. After the fastening head receives the fastener, the second synchronous belt linear guide module drives the fastening machine to lift upward first, and then enters the fastener transfer and implantation fastening process.

[0008] The machine head sliding device includes side frames, a crossbeam, and a third synchronous belt linear guide module. A pair of the side frames are respectively and vertically fixedly mounted on both sides of the rear end of the control cabinet, and the crossbeam is fixedly mounted between the pair of side frames. The third synchronous belt linear guide module is horizontally and laterally mounted in the crossbeam, and is equipped with a third slide seat, a third linear guide rail, a third ball slider, a third stepping motor, and a third synchronous belt. These are existing technologies and will not be described in detail. The third slide seat is fixedly connected to the base plate. By setting the machine head sliding device, the fastening device is transported to the top of the corresponding workpiece fastener installation hole according to the workpiece fastening needs, and cooperates with the fastening device to fasten the fastener.

[0009] The present invention also provides a fastening method of an automatic fastening machine, comprising the following steps:

[0010] Step 1: Workpiece loading and pressing: Place the workpiece into the die frame, start the cylinder, and place the weight on the top surface of the workpiece to prevent the workpiece from being deflected during the subsequent fastening of the fasteners, which will affect the subsequent fastening of the fasteners;

[0011] Step 2: Workpiece conveying: Start the first synchronous belt linear guide module to convey the workpiece to the lower side of the fastening device;

[0012] Step 3: First fastener receiving: Start the second synchronous belt linear guide module to drive the fastener machine to move downward toward the fastener feeding device. After the fastener head receives the fastener, the second synchronous belt linear guide module drives the fastener machine to lift upward so that the lower end of the fastener is slightly higher than the top surface of the workpiece outlet pipe;

[0013] Step 4: First fastener transfer, implantation and fastening: Start the third synchronous belt linear guide module to drive the fastening device to slide laterally, and after the fastener is transported to the top of the corresponding first fastener installation hole, start the second synchronous belt linear guide module, implant the fastener into the first fastener installation hole, and then start the fastening machine to fasten the workpiece;

[0014] Step 5: Second fastener access: Start the second synchronous belt linear guide module, lift the fastening machine upward to the position, start the third synchronous belt linear guide module, return the fastening device to the initial position, repeat the corresponding actions in step 3, and complete the second fastener access;

[0015] Step 6: Workstation adjustment: Start the first synchronous belt linear guide module, move the workpiece back a certain distance (i.e. the longitudinal distance between the first fastener mounting hole and the second fastener mounting hole), so that the second fastener mounting hole is just below the fastening head motion track;

[0016] Step 7: Second fastener transfer, implantation and fastening: Start the third synchronous belt linear guide module to drive the fastening device 5 to slide laterally, and after the fastener is transported to the top of the corresponding second fastener installation hole, start the second synchronous belt linear guide module, implant the fastener into the second fastener installation hole, and then start the fastening machine to fasten the workpiece;

[0017] Step 8. Reset the device: Start the second synchronous belt linear guide module, lift the fastening machine upward into place, start the third synchronous belt linear guide module, and return the fastening device to its initial position; at the same time, start the first synchronous belt linear guide module, return the workpiece to the loading and unloading station, at which time the upper end of the weight is again clamped on the slot plate, start the cylinder, lift and reset the weight, and then take the workpiece that has completed the fastening operation of the first fastening line out of the mold frame.

[0018] Furthermore, while the first fastening line is being operated, the fastening operations of the third fastener installation hole and the fourth fastener installation hole are sequentially overlapped and implemented, thereby completing the fastening operation of the second fastening line.

[0019] Furthermore, after the first tightening line and the second tightening line are completed, the automatic tightening of the workpiece air outlet pipe is achieved.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention adopts a single-machine double-wire overlap fastening technical solution to improve the fastening efficiency of the gas outlet pipe of the workpiece (diaphragm gas meter movement).

[0022] 2. The present invention adopts a single-line diagonal fastening technical solution and sets weights on the top surface of the workpiece, which can prevent the workpiece from being deflected during the subsequent fastening of fasteners, making the force more balanced during the fastening of the outlet pipe, improving the fastening quality of the outlet pipe and the connection effect between the outlet pipe and the workpiece, and effectively preventing gas leakage caused by overpressure during fastening.

[0023] 3. The present invention adopts three sets of synchronous belt linear guide modules to make the movement of the corresponding device more controllable and accurate, thereby improving the execution accuracy of the corresponding action.

[0024] 4. The present invention adopts PLC control technology, which improves the automation level of the whole machine and ensures stable and reliable operation of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the position relationship of the workpiece conveying device of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the auxiliary pressure device of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the fastening device of the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the machine head sliding device of the present invention;

[0030] Figure 6 It is a schematic diagram of the fastening method of the present invention;

[0031] Figure 7 This is a schematic diagram of the position relationship between the outlet pipe and the movement of the diaphragm gas meter.

[0032] In the figure: 1 control cabinet, 1a control panel, 2 workpiece conveying device, 21 first synchronous belt linear guide module, 21a first slide, 22 mold frame mounting plate, 23 workpiece mold frame, 3 auxiliary pressure device, 31 door frame, 311 column, 312 cylinder mounting plate, 32 weight frame, 321 guide column, 322 slot plate, support 323, slot plate 324, U-shaped slot 324a, 33 cylinder, 34 weight, 4 fastener feeding device, 5 Fastening device, 51 protective cover, 52 base plate, 53 second synchronous belt linear guide module, 53a second slide, 54 fastening machine fixed seat, 55 fastening head guide, 56 fastening machine, 56a fastening head, 6 machine head sliding device, 61 side frame, 62 crossbeam, 63 third synchronous belt linear guide module, 63a third slide, Da first fastener mounting hole, Db second fastener mounting hole, La first fastening line, Lb second fastening line. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1An automatic fastening machine includes a control cabinet 1, a workpiece conveying device 2, an auxiliary pressure device 3, a fastener feeding device 4, a fastening device 5, and a head sliding device 6. The control cabinet 1 is equipped with a PLC controller, which is electrically connected to other devices respectively, and a control panel 1a is provided on the front. A pair of the workpiece conveying devices 2 are fixedly mounted on the control cabinet 1 in parallel longitudinally. The auxiliary pressure device 3 is vertically erected on the front end of the top of the control cabinet 1. The fastener feeding device 4 is arranged between a pair of workpiece conveying devices 2 and is installed on the control cabinet 1 for placing fasteners. The fastening device 5 is vertically arranged above the fastener feeding device 4 and is horizontally slidably connected to the head sliding device 6. The head sliding device 6 is vertically installed at the rear end of the control cabinet 1.

[0036] See also Figure 2 The workpiece conveying device 2 includes a first synchronous belt linear guide module 21, a mold frame mounting plate 22, and a mold frame 23. The first synchronous belt linear guide module 21 is provided with a first slide 21a, a first linear guide, a first ball slider, a first stepper motor, and a first synchronous belt. It is a prior art and will not be described in detail. It is used for reciprocating conveying of workpieces. The mold frame mounting plate 22 is fixedly connected to the first slide 21a. The mold frame 23 is U-shaped with an opening facing outward and is fixedly connected to the mold frame mounting plate 22 for clamping and fixing the workpiece. When loading and unloading the workpiece, the mold frame 23 is located directly below the auxiliary pressure device 3.

[0037] See also Figure 3The auxiliary pressure device 3 includes a door frame 31, a weight frame 32, a cylinder 33, and a weight 34. The door frame 31 includes a column 311 and a cylinder mounting plate 312. A pair of the columns 311 are respectively vertically fixedly mounted on the inner edges of both sides of the front end of the control cabinet 1. The cylinder mounting plate 312 is fixedly mounted on a pair of columns 311. A pair of weight frames 32 are arranged in parallel directly below the cylinder mounting plate 312 and movably penetrate the cylinder mounting plate 312, including guide columns 321, a slot plate 322, pillars 323, and a slot plate 324. Two pairs of the guide columns 321 are respectively spaced apart and vertically penetrate the cylinder mounting plate 312. A pair of slot plates 322 are respectively fixedly connected to the lower ends of the corresponding pair of guide columns 321, and are both directly below the cylinder mounting plate 312. The two pairs of pillars 323 are respectively spaced apart and vertically extend to the bottom of the cylinder mounting plate 312. The lower part is installed on the bottom surface of the corresponding slot plate 322, and a pair of the slot plates 324 are horizontally fixedly installed on the lower ends of the corresponding pair of pillars 323, and are both provided with a U-shaped slot 324a with an opening facing the head sliding device 6. A pair of the cylinders 33 are respectively vertically installed on the cylinder mounting plate 312, and the output end movably passes through the cylinder mounting plate 312 and is fixedly connected to the corresponding slot plate 322. A pair of the weights 34 are suspended on the corresponding slot plate 324 through the U-shaped slot 324a. By setting the auxiliary pressure device 3, when the workpiece is placed on the mold frame 23, the cylinder 33 drives the weight frame 32 to completely place the weight 34 on the workpiece and release the suspension from the slot plate 324. At this time, the weight frame 32 is in a stationary state, and then the first synchronous belt linear guide module 21 transports the workpiece to the bottom of the fastening device 5.

[0038] See also Figure 4The fastening device 5 includes a protective cover 51, a base plate 52, a second synchronous belt linear guide module 53, a fastening machine fixed seat 54, a fastening head guide 55, a fastening machine 56, and a fastening head 56a. The base plate 52 is vertically arranged above the fastener feeding device 4, and the top end extends into the protective cover 51. The second synchronous belt linear guide module 53 is longitudinally arranged in the protective cover 51 and is fixedly installed on the front of the base plate 52. A second slide seat 53a, a second linear guide, a second ball slider, a second stepping motor, and a second synchronous belt are provided therein. They are prior art and will not be described in detail. The fastening head 56a for receiving the fastener is gradually fed into the fastener installation hole of the workpiece. After the fastener is fastened, the fastening head 56a is pulled out of the fastener installation hole of the workpiece. The fastening machine fixed seat 54 is fixedly installed horizontally forward. Located at the lower end of the front face of the second slide seat 53a, the fastening head guide 55 is Z-shaped, with the upper end fixedly connected to the ball slider, and the lower end passing through the fastening machine fixed seat 54. When not in operation, it is located directly above the fastener feeding device 4 (i.e., the initial position), matching the workpiece fastener mounting hole. The fastening machine 56 is vertically fixedly mounted on the fastening machine fixed seat 54, and a fastening head 56a is provided at the lower end. The fastening head 56a is vertically downwardly connected to the fastening head guide 55 for rolling. By setting the fastening device 5, when the workpiece is transported into place, the second synchronous belt linear guide module 53 drives the fastening machine 56 to move downward toward the fastener feeding device 4. After the fastening head 56a receives the fastener, the second synchronous belt linear guide module 53 drives the fastening machine 56 to lift upward first, and then enters the fastener transfer and implantation fastening process.

[0039] See also Figure 5 The machine head sliding device 6 includes a side frame 61, a crossbeam 62, and a third synchronous belt linear guide module 63. A pair of the side frames 61 are respectively and vertically fixedly mounted on both sides of the rear end of the control cabinet 1, and the crossbeam 62 is fixedly mounted between the pair of side frames 61. The third synchronous belt linear guide module 63 is horizontally and laterally mounted in the crossbeam 62, and is equipped with a third slide 63a, a third linear guide, a third ball slider, a third stepping motor, and a third synchronous belt. These are prior arts and will not be described in detail. The third slide 63a is fixedly connected to the base plate 52. By setting the machine head sliding device 6, the fastening device 5 is transported to the top of the corresponding workpiece fastener installation hole according to the workpiece fastening needs, and cooperates with the fastening device 5 to fasten the fastener.

[0040] See also Figure 1-7 The present invention also provides a fastening method of an automatic fastening machine, comprising the following steps:

[0041] Step 1: Workpiece loading and pressing: Place the workpiece into the die frame 23, start the cylinder 33, and place the weight 34 on the top surface of the workpiece to prevent the workpiece from being deflected during the subsequent fastening process of the fasteners, thereby affecting the subsequent fastening of the fasteners;

[0042] Step 2: Workpiece conveying: Start the first synchronous belt linear guide module 21 to convey the workpiece to the lower side of the fastening device 5;

[0043] Step 3: First fastener receiving: Start the second synchronous belt linear guide module 53 to drive the fastener machine 56 to move downward toward the fastener feeding device 4. After the fastener head 56a receives the fastener, the second synchronous belt linear guide module 53 drives the fastener machine 56 to first lift upward so that the lower end of the fastener is slightly higher than the top surface of the workpiece outlet pipe;

[0044] Step 4: First fastener transfer, implantation and fastening: Start the third synchronous belt linear guide module 63 to drive the fastening device 5 to slide laterally, and after the fastener is transported to the top of the corresponding first fastener installation hole Da, start the second synchronous belt linear guide module 53, implant the fastener into the first fastener installation hole Da, and then start the fastening machine 56 to fasten the workpiece;

[0045] Step 5: Second fastener receiving: Start the second synchronous belt linear guide module 53, lift the fastening machine 56 upward to the position, start the third synchronous belt linear guide module 63, return the fastening device 5 to the initial position, repeat the corresponding actions of step 3, and complete the second fastener receiving;

[0046] Step 6, workstation adjustment: start the first synchronous belt linear guide module 21, move the workpiece back a certain distance (i.e. the longitudinal distance between the first fastener mounting hole Da and the second fastener mounting hole Db), so that the second fastener mounting hole Db is just below the motion track of the fastening head 56a;

[0047] Step 7: Second fastener transfer, implantation and fastening: Start the third synchronous belt linear guide module 63 to drive the fastening device 5 to slide laterally, and after the fastener is transported to the top of the corresponding second fastener installation hole Db, start the second synchronous belt linear guide module 53, implant the fastener into the second fastener installation hole Db, and then start the fastening machine 56 to fasten the workpiece;

[0048] Step eight, device reset: start the second synchronous belt linear guide module 53, lift the fastening machine 56 upward to its position, start the third synchronous belt linear guide module 63, and return the fastening device 5 to its initial position; at the same time, start the first synchronous belt linear guide module 21, return the workpiece to the loading and unloading station, at this time, the upper end of the weight 34 is again clamped on the slot plate 324, start the cylinder 33, lift and reset the weight 34, and then take the workpiece that has completed the fastening operation of the first fastening line La out of the mold frame 23.

[0049] Furthermore, while the first fastening line La of the present invention is being operated, the third fastener installation hole Dc and the fourth fastener installation hole Dd can be fastened in sequence, thereby completing the fastening operation of the second fastening line Lb.

[0050] Furthermore, after the first tightening line La and the second tightening line Lb are completed, the automatic tightening of the workpiece air outlet pipe is achieved.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The present invention adopts a single-machine double-wire overlap fastening technical solution to improve the fastening efficiency of the gas outlet pipe of the workpiece (diaphragm gas meter movement).

[0053] 2. The present invention adopts a single-line diagonal fastening technical solution and sets weights on the top surface of the workpiece, which can prevent the workpiece from being deflected during the subsequent fastening of fasteners, making the force more balanced during the fastening of the outlet pipe, improving the fastening quality of the outlet pipe and the connection effect between the outlet pipe and the workpiece, and effectively preventing gas leakage caused by overpressure during fastening.

[0054] 3. The present invention adopts three sets of synchronous belt linear guide modules to make the movement of the corresponding device more controllable and accurate, thereby improving the execution accuracy of the corresponding action.

[0055] 4. The present invention adopts PLC control technology, which improves the automation level of the whole machine and ensures stable and reliable operation of the whole machine.

[0056] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic fastening machine, comprising a control cabinet (1), a workpiece conveying device (2), an auxiliary pressure device (3), a fastener feeding device (4), a fastening device (5), and a machine head sliding device (6), characterized in that: The control cabinet (1) is provided with a PLC controller which is electrically connected to other devices respectively, and a control panel (1a) is provided on the front. A pair of the workpiece conveying devices (2) are fixedly mounted on the control cabinet (1) in a longitudinally parallel manner. The auxiliary pressure device (3) is vertically erected on the front end of the top of the control cabinet (1). The fastener feeding device (4) is arranged between the pair of workpiece conveying devices (2) and is installed on the control cabinet (1). The fastening device (5) is vertically arranged above the fastener feeding device (4) and is horizontally slidably connected to the machine head sliding device (6). The machine head sliding device (6) is vertically mounted on the rear end of the control cabinet (1). The workpiece conveying device (2) comprises a first synchronous belt linear guide rail module (21), a mold frame mounting plate (22), and a mold frame (23); the first synchronous belt linear guide rail module (21) is provided with a first slide seat (21a), a first linear guide rail, a first ball slider, a first stepper motor, and a first synchronous belt; the mold frame mounting plate (22) is fixedly connected to the first slide seat (21a); ​​the mold frame (23) is U-shaped, with an opening facing outward, and is fixedly connected to the mold frame mounting plate (22); The auxiliary pressure device (3) comprises a door frame (31), a weight frame (32), a cylinder (33), and a weight (34); the door frame (31) comprises a column (311) and a cylinder mounting plate (312); a pair of the columns (311) are respectively and vertically fixedly mounted on the inner edges of both sides of the front end of the control cabinet (1); the cylinder mounting plate (312) is fixedly mounted on a pair of columns (311); a pair of the weight frames (32) are arranged in parallel directly below the cylinder mounting plate (312) and movably penetrate the cylinder mounting plate (312); the weight frames (32) comprise guide columns (321), a slot plate (322), a support column (323), and a slot plate (324); two pairs of the guide columns (321) are respectively and spaced apart and vertically penetrate the cylinder mounting plate (312); a pair of slots (324) are respectively and spaced apart and vertically penetrate the cylinder mounting plate (312); The position plates (322) are respectively fixedly connected to the lower ends of the corresponding pair of guide pillars (321) and are both directly below the cylinder mounting plate (312); the two pairs of pillars (323) are respectively installed vertically downward on the bottom surface of the corresponding slot plate (322) at intervals; a pair of slot plates (324) are horizontally fixedly installed on the lower ends of the corresponding pair of pillars (323) and are both provided with U-shaped slots (324a) with openings facing the machine head sliding device (6); the pair of cylinders (33) are respectively vertically installed on the cylinder mounting plate (312); the output ends movably penetrate the cylinder mounting plate (312) and are fixedly connected to the corresponding slot plates (322); and the pair of weights (34) are suspended on the corresponding slot plates (324) through the U-shaped slots (324a); The fastening device (5) comprises a protective cover (51), a base plate (52), a second synchronous belt linear guide rail module (53), a fastening machine fixing seat (54), a fastening head guide (55), a fastening machine (56), and a fastening head (56a). The base plate (52) is vertically arranged above the fastener feeding device (4), and the top end extends into the protective cover (51). The second synchronous belt linear guide rail module (53) is longitudinally arranged in the protective cover (51) and fixedly mounted on the front of the base plate (52). A second slide seat (53a) is arranged inside the base plate (52). ), a second linear guide rail, a second ball slider, a second stepping motor, and a second synchronous belt; the fastening machine fixing seat (54) is fixedly mounted horizontally and forwardly on the lower front end of the second slide seat (53a); the fastening head guide (55) is Z-shaped, with the upper end fixedly connected to the ball slider and the lower end penetrating the fastening machine fixing seat (54); the fastening machine (56) is vertically fixedly mounted on the fastening machine fixing seat (54), and a fastening head (56a) is provided at the lower end, and the fastening head (56a) is vertically downwardly connected to the fastening head guide (55) in a rolling manner; The machine head sliding device (6) comprises a side frame (61), a crossbeam (62), and a third synchronous belt linear guide rail module (63); a pair of the side frames (61) are respectively and vertically fixedly mounted on both sides of the rear end of the control cabinet (1) facing each other; the crossbeam (62) is fixedly mounted between the pair of side frames (61); the third synchronous belt linear guide rail module (63) is horizontally and laterally mounted in the crossbeam (62), and is provided with a third slide seat (63a), a third linear guide rail, a third ball slider, a third stepping motor, and a third synchronous belt; the third slide seat (63a) is fixedly connected to the base plate (52); The fastening method includes the following steps: Step 1: Pressurizing the workpiece: placing the workpiece into the die frame (23), starting the cylinder (33), and placing the weight (34) on the top surface of the workpiece to prevent the workpiece from being deflected during the subsequent fastening process of the fasteners, thereby affecting the subsequent fastening of the fasteners; Step 2: Workpiece conveying: Start the first synchronous belt linear guide module (21) to convey the workpiece to the lower side of the fastening device (5); Step 3: First fastener receiving: Start the second synchronous belt linear guide module (53) to drive the fastening machine (56) to move downward toward the fastener feeding device (4); after the fastening head (56a) receives the fastener, the second synchronous belt linear guide module (53) drives the fastening machine (56) to first lift upward so that the lower end of the fastener is slightly higher than the top surface of the workpiece air outlet pipe; Step 4: First fastener transfer, implantation and fastening: Start the third synchronous belt linear guide module (63) to drive the fastening device (5) to slide laterally, and after the fastener is transported to the top of the corresponding first fastener installation hole (Da), start the second synchronous belt linear guide module (53), implant the fastener into the first fastener installation hole (Da), and then start the fastening machine (56) to fasten the workpiece; Step 5: Receiving the fastener for the second time: starting the second synchronous belt linear guide module (53), lifting the fastening machine (56) upward to the position, starting the third synchronous belt linear guide module (63), returning the fastening device (5) to the initial position, and repeating the corresponding actions of step 3 to complete the receiving of the fastener for the second time; Step 6, workstation adjustment: start the first synchronous belt linear guide module (21), and move the workpiece back according to the longitudinal spacing from the first fastener mounting hole (Da) to the second fastener mounting hole (Db), so that the second fastener mounting hole (Db) is just below the motion trajectory of the fastening head (56a); Step 7, second fastener transfer, implantation and fastening: start the third synchronous belt linear guide module (63), drive the fastening device (5) to slide laterally, and after the fastener is transported to the top of the corresponding second fastener installation hole (Db), start the second synchronous belt linear guide module (53), implant the fastener into the second fastener installation hole (Db), and then start the fastening machine (56) to fasten the workpiece; Step 8, device reset: start the second synchronous belt linear guide module (53), lift the fastening machine (56) upward to the position, start the third synchronous belt linear guide module (63), and return the fastening device (5) to the initial position; at the same time, start the first synchronous belt linear guide module (21), return the workpiece to the loading and unloading station, at this time, the upper end of the weight (34) is again clamped on the card slot plate (324), start the cylinder (33), lift the weight (34) and reset it, and then take the workpiece that has completed the first fastening line (La) fastening operation out of the mold frame (23).

2. An automatic fastening machine according to claim 1, characterized in that: While the first fastening line (La) is being operated, the third fastener installation hole (Dc) and the fourth fastener installation hole (Dd) are fastened in sequence, thereby completing the fastening operation of the second fastening line (Lb).

3. An automatic fastening machine according to claim 2, characterized in that: After the first tightening line (La) and the second tightening line (Lb) are completed, the automatic tightening of the workpiece outlet pipe is achieved.

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