Efficient wood pallet loose nail driving device

Abstract

The utility model provides a kind of efficiency improved loose nail driving device for wooden pallet, including driving module and supply nail module, driving module includes a gas storage cylinder, a piston placed in gas storage cylinder reciprocating sliding, two or three impact pins connected on the end face of piston, for driving nail work, supply nail module includes nail guide tube, nail head and nail transfer assembly between nail guide tube and nail head, the number of nail guide tube and nail head is same with impact pin, the outlet channel of nail head is arranged on the moving path of impact pin in straight line, and there is magnet on the side wall surface of outlet channel of nail head, which can adsorb nail;The structure design of supply nail module is more compact and reasonable;In driving module, the number and position of impact pin can be adjusted according to needs, and various driving patterns can be formed, and the adjustment process is also very convenient and fast;During driving work, multiple nails are driven into the foot block of wooden pallet synchronously, and the overall working efficiency is higher.

Description

Technical Field

[0001] This invention relates to an efficient nailing device for wooden pallets. Background Technology

[0002] The applicant has been dedicated to the research and development of a loose nailing device for wooden pallets. The applicant's prior patent application, publication number CN117162205A, entitled "A Loose Nailing Device for Wooden Pallets," states that "typically, two or three nails need to be driven into a single leg of a wooden pallet..." Figure 9 The image shows the case where two nails are driven in. Figure 10 The diagram shows the case where three nails are driven in. In this solution, the nail-driving component can only drive in one nail at a time. The drive motor then adjusts the rotation angle of the large gear, thereby adjusting the position of the nail head to drive in the next nail.

[0003] In the technical solution with application publication number CN117162205A, the nail is driven in step by step, and the efficiency needs to be further improved. Summary of the Invention

[0004] To address the shortcomings mentioned above, this invention provides an efficient nailing device for wooden pallets.

[0005] To achieve the above objectives, the present invention provides an efficient loose-nail nailing device for wooden pallets, comprising: A nailing module, comprising an air reservoir, a piston that reciprocates within the air reservoir, and two or three impact nails connected to the end face of the piston for nailing operations. The nail feeding module includes a nail feeding guide tube, a nail head, and a nail transfer assembly disposed between the nail feeding guide tube and the nail head. The number of the nail feeding guide tube and the number of the nail heads are the same as the number of the firing pin. The nail outlet channel of the nail head and the moving path of the firing pin are arranged in a straight line, and the nail head is provided with a magnet that can attract nails on the side wall of the nail outlet channel. The nail transfer assembly includes a rotary cylinder that forms a connection between the nail feed guide tube and the nail head, a nail supply solenoid valve for controlling the rotation of the rotary cylinder, and a nail guide disk. The nail guide disk is fixedly connected to the rotation shaft of the rotary cylinder, and a nail receiving groove for receiving nails is formed on the surface of the nail guide disk.

[0006] Furthermore, the gas storage cylinder includes an outer cylinder, an inner cylinder, a front end cover, a rear end cover, and multiple sealing rings. The outer cylinder, the inner cylinder, the front end cover, and the rear end cover are connected by screws and nuts to form a whole. A first air chamber is formed between the outer cylinder and the inner cylinder. An air hole is machined on the wall of the inner cylinder. The piston includes a piston cylinder, a piston front cover and a piston rear cover connected to both ends of the piston cylinder, a sealing ring and a guide ring disposed on the wall of the piston cylinder. A small-diameter section is formed in the middle of the piston cylinder. An air hole is machined on the upper part of the small-diameter section of the piston cylinder. During assembly, a second air chamber is formed between the small-diameter section and the inner cylinder. The first air chamber communicates with the piston cavity of the piston through the air hole, the second air chamber, and the air hole.

[0007] Furthermore, a firing pin fixing block is fixedly connected to the piston front cover. The firing pin fixing block has multiple through holes for the firing pin to pass through and be mounted on the piston front cover by the elastic force of the compression spring. This allows the number and position of the firing pins to be adjusted as needed.

[0008] Furthermore, the piston front cover is also equipped with a buffer pad and a guide pin, which is also disposed on the piston front cover by the elastic force of a compression spring.

[0009] Furthermore, the nailing module also includes a cylinder head connected to the upper end of the gas storage cylinder, an on / off valve assembly installed in the cylinder head, and a nailing solenoid valve for nailing control. The on / off valve assembly includes a spring seat installed in the cylinder head, an on / off valve slidably placed in the cylinder head, a fixing ring fixed to the lower part of the cylinder head to limit the downward position of the on / off valve, and an on / off compression spring disposed between the spring seat and the on / off valve. A sealing ring three and a sealing ring four are disposed on the outer side of the on / off valve. The sealing ring three forms an on / off valve chamber between the on / off valve and the cylinder head. A sealing ring five is disposed at the lower part of the on / off valve. An exhaust channel is also machined on the on / off valve. An exhaust hole one corresponding to the exhaust channel is formed on the cylinder head. A sealing ring six is ​​disposed on the outer side of the fixing ring. The sealing ring six is ​​used to achieve assembly sealing between the fixing ring and the inner cylinder.

[0010] Furthermore, the cylinder head is also provided with an intake connector, a first connector, and a second connector. The intake connector is connected to a high-pressure gas source to supply high-pressure gas into the first air chamber. The first connector is connected to the valve chamber of the on / off valve and is connected to the nailing solenoid valve through a pipeline. The second connector is connected to the first air chamber and is connected to the nailing solenoid valve through a pipeline. The nailing solenoid valve is a two-position three-normally open solenoid valve.

[0011] Furthermore, the rotary cylinder includes a cylinder housing and a rack piston that slides within the cylinder housing. The rotating shaft has teeth that mesh with the rack piston. Both ends of the rotary cylinder are connected to the nail-feeding solenoid valve via pipelines. The nail-driving solenoid valve is a three-position, five-position normally open solenoid valve. When the nail-driving solenoid valve is working, it causes the rotary cylinder to rotate 180 degrees.

[0012] Furthermore, the number of firing pins is three, and correspondingly, the number of the nail guide tube, the nail head, and the rotary cylinder are all three.

[0013] Furthermore, the nail supply module also includes an upper nail head fixing block, a lower nail head fixing block, and a connecting rod that connect the three nail heads to form a whole. The connecting rod is fixedly connected to the upper nail head fixing block and the lower nail head fixing block by connecting screws, so that the nail head is limited between the upper nail head fixing block and the lower nail head fixing block. The upper nail head fixing block is fixedly connected to the air storage cylinder by connecting screws.

[0014] Furthermore, the cylinder head is also provided with a fixing seat for fixing the inlet guide tube, and the cylinder head is also provided with an exhaust cover, on which an exhaust hole is machined.

[0015] The advantages of this invention over the prior art are as follows: 1. Compared with the technical solution of CN117162205A, the structural design of the nail supply module is more compact and reasonable; 2. In the nailing module, the number and position of the striking pins can be adjusted as needed to form various nailing patterns, and the adjustment process is also very convenient and quick; 3. During nailing operations, multiple nails are driven into the wooden pallet's foot blocks simultaneously, resulting in higher overall work efficiency. Attached Figure Description

[0016] Figure 1 A perspective view of a loose nailing device for improving the efficiency of wooden pallets; Figure 2 A cross-sectional view of a loose nailing device for improving the efficiency of wooden pallets; Figure 3 An exploded view of a loose nailing device for improving the efficiency of wooden pallets; Figure 4 for Figure 3 Exploded view of the nail supply module in the image; Figure 5 for Figure 3 A cross-sectional view of the nail supply module; Figure 6 This is a schematic diagram showing the distribution of the guide nail trays involved; Figure 7 This is a connection diagram of the rotary cylinder and the nail supply solenoid valve involved. Figure 8 This is a cross-sectional view of the gas storage cylinder involved. Figure 9 This is a cross-sectional view of the piston in question; Figure 10 This is a schematic diagram of the piston and firing pin fixing block involved; Figure 11 This is a schematic diagram of the cylinder head and valve assembly involved. Figure 12 A perspective view of the cylinder head and valve assembly involved; Figure 13 This is an illustration of a nailing pattern (three nails on the same circumference); Figure 14 This is an illustration of a nailing pattern (the three nails are not on the same circumference); Figure 15 This is an illustration of a nailing pattern (two nails in a straight line). Figure 16 Illustration of nailing operation Figure 1 (Initial state); Figure 17 Illustration of nailing operation Figure 2 (Fishing completed); Figure 18 Illustration of nailing operation Figure 3 (To achieve nailing); Figure 19 Illustration of nailing operation Figure 4 (Piston reset).

[0017] In the diagram: 100, nailing module; 10, air storage cylinder; 101, outer cylinder; 102, inner cylinder; 1021, air port one; 103, front end cover; 104, rear end cover; 105, sealing ring one; 106, screw; 107, nut; 108, first air chamber; 109, inner cylinder cavity; 11, piston; 111, piston cylinder; 1111, small diameter section; 1112, air port two; 112, piston front cover; 113 114. Piston rear cover; 115. Sealing ring II; 116. Guide ring; 117. Piston inner cavity; 118. Second air chamber; 119. Strike pin; 12. Strike pin; 13. Strike pin fixing block; 131. Through hole; 14. Compression spring; 15. Buffer pad; 16. Guide pin; 17. Cylinder head; 171. Exhaust port I; 18. On / off valve assembly; 181. Spring seat; 182. On / off compression spring; 183. On / off valve; 1831. Exhaust vent 184. Fixing ring; 185. Sealing ring three; 186. Sealing ring four; 187. On / off valve chamber; 188. Sealing ring five; 189. Sealing ring six; 19. Nail-driving solenoid valve; 20. Air inlet connector; 21. First connector; 22. Second connector; 23. Fixing base; 24. Exhaust cover; 241. Exhaust hole two; 25. Guide slider assembly; 200. Nail; 300. Nail supply module; 31. Nail feeder. 32. Guide tube; 32. Nail head; 321. Nail delivery channel; 33. Nail transfer assembly; 331. Rotary cylinder; 3311. Cylinder housing; 3312. Rack and pinion piston; 3313. Rotating shaft; 332. Nail supply solenoid valve; 333. Nail guide disc; 3331. Nail receiving groove; 34. Magnet; 35. Upper nail head fixing block; 36. Connecting rod; 37. Lower nail head fixing block; 400. Flat plate; 500. Foot block. Detailed Implementation

[0018] like Figures 1-7As shown in the figure, an efficient nailing device for wooden pallets according to an embodiment of the present invention includes a nailing module 100 and a nail supply module 300. The nailing module 100 includes an air storage cylinder 10, a piston 11 that reciprocates within the air storage cylinder 10, and three impact nails 200 connected to the end face of the piston 11 for nailing operations. The nail supply module 300 includes a nail guide tube 31, nail heads 32, and a nail transfer assembly 33 disposed between the nail guide tube 31 and the nail heads 32. The number of nail guide tubes 31 and nail heads 32 is the same as the number of impact nails 12, which is also three. The upper end of the nail guide tube 31 is connected to a vibratory feeder to achieve orderly feeding. The nail ejection channel 321 and the moving path of the firing pin 12 are arranged in a straight line, and a nail head 32 is provided with a magnet 34 on the side wall of the nail ejection channel 321 to attract nails 200. In the figure, two magnets 34 are used to attract one nail 200. The nail transfer assembly 33 includes a rotary cylinder 331 that forms a connection between the nail guide tube 31 and the nail head 32, a nail feeding solenoid valve 332 for controlling the rotation of the rotary cylinder 331, and a nail guide plate 333. The nail guide plate 333 is fixedly connected to the rotation shaft 3313 of the rotary cylinder 331. A nail receiving groove 3331 for accommodating nails 200 is formed on the surface of the nail guide plate 333. See the nail receiving groove 3331. Figure 6 ; Combination Figure 5 , Figure 7 The rotary cylinder 331 includes a cylinder housing 3311 and a rack piston 3312 that slides inside the cylinder housing 3311. The rotating shaft 3313 has teeth that mesh with the rack piston 3312. Both ends of the rotary cylinder 331 are connected to the nail supply solenoid valve 332 through pipelines. The nail-driving solenoid valve 19 is a three-position five-normally open solenoid valve. When the nail-driving solenoid valve 19 is working, the rotary cylinder 331 rotates by 180 degrees. Combination Figure 4 , Figure 5 The nail supply module 300 also includes an upper nail head fixing block 35, a lower nail head fixing block 37, and a connecting rod 36 that connect three nail heads 32 to form a whole. The connecting rod 36 is fixedly connected to the upper nail head fixing block 35 and the lower nail head fixing block 37 by connecting screws, so that the nail head 32 is limited between the upper nail head fixing block 35 and the lower nail head fixing block 37. The upper nail head fixing block 35 is fixedly connected to the air storage cylinder 10 by connecting screws. See Figure 8 The air storage cylinder 10 includes an outer cylinder 101, an inner cylinder 102, a front end cover 103, a rear end cover 104, and multiple sealing rings 105. The outer cylinder 101, the inner cylinder 102, the front end cover 103, and the rear end cover 104 are connected by screws 106 and nuts 107 to form a whole. A first air chamber 108 is formed between the outer cylinder 101 and the inner cylinder 102. Air holes 1021 are machined on the wall surface of the inner cylinder 102. See Figure 9 The piston 11 includes a piston cylinder 111, a piston front cover 112 and a piston rear cover 113 connected to both ends of the piston cylinder 111, a sealing ring 114 and a guide ring 115 disposed on the wall surface of the piston cylinder 111. A small-diameter section 1111 is formed in the middle of the piston cylinder 111. A second air hole 1112 is machined on the upper part of the small-diameter section 1111. During assembly, a second air chamber 117 is formed between the small-diameter section 1111 and the inner cylinder 102. The first air chamber 108 communicates with the piston inner cavity 116 of the piston 11 through the first air hole 1021, the second air chamber 117, and the second air hole 1112. The second air chamber 117 formed between the small-diameter section 1111 and the inner cylinder 102 is as follows: Figure 2 As shown; See Figure 9 , Figure 10 A firing pin fixing block 13 is fixedly connected to the piston front cover 112. Multiple through holes 131 are formed on the firing pin fixing block 13 for the firing pin 12 to pass through and be installed. The firing pin 12 passes through the through holes 131 and is positioned on the piston front cover 112 by the elastic force of the compression spring 14, so that the number and position of the firing pin 12 can be adjusted as needed. Figures 13-15 All of these are schematic nailing patterns, but the nailing patterns are not limited to the three mentioned above; the piston front cover 112 is also equipped with a buffer pad 15 and a guide pin 16, and the guide pin 16 is also configured on the piston front cover 112 by the elastic force of the compression spring 14. See Figure 11 , Figure 12 The nailing module 100 also includes a cylinder head 17 connected to the upper end of the gas storage cylinder 10, an on / off valve assembly 18 installed in the cylinder head 17, and a nailing solenoid valve 19 for nailing control. The on / off valve assembly 18 includes a spring seat 181 installed in the cylinder head 17, an on / off valve 183 slidably placed in the cylinder head 17, a fixing ring 184 fixed below the cylinder head 17 to limit the downward position of the on / off valve 183, and an on / off compression spring 182 disposed between the spring seat 181 and the on / off valve 183. A sealing ring 185 and a sealing ring 186 are disposed on the outside of the on / off valve 183. The sealing ring 185 enables the on / off valve to open and close. 183. An on / off valve chamber 187 is formed between the cylinder head 17 and the cylinder head 183. A sealing ring 188 is provided at the lower part of the on / off valve 183. An exhaust passage 1831 is also machined on the on / off valve 183. An exhaust hole 171 corresponding to the exhaust passage 1831 is formed on the cylinder head 17. A sealing ring 189 is provided on the outer side of the fixing ring 184. The sealing ring 189 is used to achieve the assembly seal between the fixing ring 184 and the inner cylinder 102. The cylinder head 17 is also provided with a fixing seat 23 for fixing and installing the inlet guide tube 31. The cylinder head 17 is also provided with an exhaust cover 24. An exhaust hole 241 is machined on the exhaust cover 24. Combination Figure 1 , Figure 11 , Figure 12 The cylinder head 17 is also provided with an intake connector 20, a first connector 21, and a second connector 22. The intake connector 20 is connected to a high-pressure gas source to supply high-pressure gas into the first air chamber 108. The first connector 21 is connected to the valve chamber 187 of the on / off valve and is connected to the nailing solenoid valve 19 through a pipeline. The second connector 22 is connected to the first air chamber 108 and is connected to the nailing solenoid valve 19 through a pipeline. The nailing solenoid valve 19 is a two-position three-normally open solenoid valve.

[0019] The nail supply module has a more compact and reasonable structural design; in the nailing module, the number and position of the striking pins can be adjusted as needed to form a variety of nailing patterns, and the adjustment process is also very convenient and quick; during nailing operations, multiple nails are driven into the wooden pallet's foot blocks simultaneously, resulting in higher overall work efficiency.

[0020] In practical use, the invention will be described in conjunction with the accompanying drawings for ease of understanding; Figures 16-19 A schematic diagram of a nailing cycle for this device; See Figure 16 At this initial state, the intake connector 20 supplies high-pressure gas into the first air chamber 108. The high-pressure gas passes through the air hole 1021 of the inner cylinder 102, the second air chamber 117, and the second air hole 1112 to reach the piston inner cavity 116, which is manifested as high pressure at the second air chamber 117. At the same time, the high-pressure gas passes through the second connector 22, the nail-driving solenoid valve 19, and the first connector 21 to the valve chamber 187 of the opening and closing valve, which is manifested as high pressure at the valve chamber 187 of the opening and closing valve. At this time, the exhaust passage 1831 is connected to the atmosphere, that is, the inner cylinder inner cavity 109 and the upper part of the piston 11 are at normal pressure. Under the action of the high-pressure gas in the second air chamber 117, the piston 11 is in a high position, and the opening and closing valve 183 descends to be tightly pressed against the fixing ring 184 and sealed by the sealing ring 188. There is no nail 200 at the nail outlet channel 321 of the nail head 32.

[0021] See Figure 17 At this point, the nail feeding is complete, meaning that the nail 200 is in the nail outlet channel 321 of the nail head 32. The nail feeding process is as follows: The nail feeding solenoid valve 332 is activated, which causes the rack piston 3312 to move by switching the air path direction. The movement of the rack piston 3312 is converted into the rotation of the rotating shaft 3313. The guide nail disk 333 rotates synchronously with the rotating shaft 3313. That is, the nail 200 in the nail receiving groove 3331 of the guide nail disk 333 is rotated 180 degrees by the action of the nail feeding solenoid valve 332. After that, the nail 200 is attracted by the magnet 34 in the nail outlet channel 321, thus realizing the nail feeding process. After that, the nail feeding solenoid valve 332 is reset to prepare for the next nail feeding process.

[0022] See Figure 18At this time, the nailing process is underway. During nailing, the nailing solenoid valve 19 is activated, and the valve core of the nailing solenoid valve 19 moves to the left. In this way, the first connector 21 is connected to the atmosphere through the nailing solenoid valve 19, which means that the valve chamber 187 of the opening and closing valve is under normal pressure, while the pipeline from the second connector 22 to the nailing solenoid valve 19 is blocked. The pressure difference forces the opening and closing valve 183 to overcome the elastic force of the opening and closing spring 182 and move upward, so that a gap is formed between the opening and closing valve 183 and the fixing ring 184. The high-pressure gas in the first air chamber 108 flows to the top of the piston 11 through the gap formed between the opening and closing valve 183 and the fixing ring 184, causing the piston 11 to move downward. This means that the high-speed moving firing pin 12 shoots out the nail 200 attracted by the magnet 34 at the nail outlet channel 321. The shot nail 200 is driven into the plate 400 and the foot block 500, realizing the fixed connection of the plate 400 and the foot block 500.

[0023] See Figure 19 At this time, the piston is reset. The specific process is as follows: the nailing solenoid valve 19 is reset, and the second connector 22 supplies high-pressure gas into the valve chamber 187 of the opening and closing valve again through the nailing solenoid valve 19 and the first connector 21. The valve chamber 187 of the opening and closing valve is in a high-pressure state. The opening and closing valve 183 is subjected to the gas pressure and the elastic force of the opening and closing spring 182. The opening and closing valve 183 moves downward and is pressed tightly against the fixing ring 184, and is sealed by the sealing ring 188. At this time, the second air chamber 117 is in a high-pressure state, that is, the piston 11 is subjected to the gas pressure and undergoes the process of resetting upward. During the reset, the gas in the inner cylinder cavity 109 above the piston 11 is exhausted to the outside through the exhaust channel 1831, the exhaust hole 171, and the exhaust hole 241 of the exhaust cover 24. The arrow in the figure indicates the exhaust process.

[0024] Additionally, see Figure 18 At this point, the piston 11 reaches the lower stop position (i.e., the bottommost position) of the air storage cylinder 10. In this state, the nailing module 100 can be completely removed from the nail supply module 300, and then the firing pin fixing block 13 can be removed. The number of firing pins and the relative positions between multiple firing pins can be adjusted as needed, so that the device can meet the actual needs of various nailing patterns. To facilitate the disassembly and assembly of the nailing module 100, a guide slider assembly 25 for disassembly and assembly is provided on one side of the air storage cylinder 10. The quick disassembly and assembly of the air storage cylinder 10 can be achieved through the cooperation of the guide slider assembly 25 with the frame. Of course, when the piston 11 is at the upper stop position (i.e., the topmost position) of the air storage cylinder 10, the nailing module 100 can also be completely removed from the nail supply module 300. Then, the piston 11 can be controlled by the nailing solenoid valve 19 to reach the lower stop position (i.e., the bottommost position) of the air storage cylinder 10, and then the firing pin fixing block 13 can be removed. The number of firing pins and the relative positions between multiple firing pins can be adjusted as needed, so that the device can meet the actual needs of various nailing patterns.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An efficient nailing device for wooden pallets, characterized in that: include The nailing module (100) includes an air storage cylinder (10), a piston (11) placed in the air storage cylinder (10) and sliding back and forth, and two or three impact nails (200) connected to the end face of the piston (11) for nailing operation. The nail supply module (300) includes a nail feeding guide tube (31), a nail head (32), and a nail transfer assembly (33) disposed between the nail feeding guide tube (31) and the nail head (32). The number of the nail feeding guide tube (31) and the number of the nail head (32) are the same as the number of the firing pin (12). The nail outlet channel (321) of the nail head (32) and the moving path of the firing pin (12) are arranged in a straight line. The nail head (32) is provided with a magnet (34) on the side wall of the nail outlet channel (321) to attract nails (200). The nail transfer assembly (33) includes a rotary cylinder (331) connected between the nail feed guide tube (31) and the nail head (32), a nail feeding solenoid valve (332) for controlling the rotation of the rotary cylinder (331), and a nail guide disc (333). The nail guide disc (333) is fixedly connected to the rotation shaft (3313) of the rotary cylinder (331), and a nail receiving groove (3331) for receiving nails (200) is formed on the surface of the nail guide disc (333). The piston (11) includes a piston front cover (112), on which a firing pin fixing block (13) is fixedly connected. The firing pin fixing block (13) has multiple through holes (131) for the firing pin (12) to pass through and be installed. The firing pin (12) passes through the through holes (131) and is positioned on the piston front cover (112) by the elastic force of the compression spring (14), thereby realizing that the number and position of the firing pin (12) can be adjusted as needed.

2. The improved efficiency nailing device for wooden pallets according to claim 1, characterized in that: The gas storage cylinder (10) includes an outer cylinder (101), an inner cylinder (102), a front end cover (103), a rear end cover (104), and multiple sealing rings (105). The outer cylinder (101), the inner cylinder (102), the front end cover (103), and the rear end cover (104) are connected by a screw (106) and a nut (107) to form a whole. A first air chamber (108) is formed between the outer cylinder (101) and the inner cylinder (102). An air hole (1021) is machined on the wall of the inner cylinder (102). The piston (11) includes a piston cylinder (111), a piston front cover (112) connected to both ends of the piston cylinder (111), a piston rear cover (113), sealing rings (114) and guide rings (115) disposed on the wall of the piston cylinder (111). The piston cylinder (111) A small diameter section (1111) is formed in the middle. The piston cylinder (111) has a second air hole (1112) machined on the upper part of the small diameter section (1111). During assembly, a second air chamber (117) is formed between the small diameter section (1111) and the inner cylinder (102). The first air chamber (108) is connected to the piston cavity (116) of the piston (11) through the first air hole (1021), the second air chamber (117), and the second air hole (1112).

3. The improved efficiency nailing device for wooden pallets according to claim 1, characterized in that: The piston front cover (112) is also provided with a buffer pad (15) and a guide pin (16), which is also disposed on the piston front cover (112) by the elastic force of the compression spring (14).

4. The improved efficiency nailing device for wooden pallets according to claim 2, characterized in that: The nailing module (100) further includes a cylinder head (17) connected to the upper end of the gas storage cylinder (10), an on / off valve assembly (18) installed in the cylinder head (17), and a nailing solenoid valve (19) for nailing control. The on / off valve assembly (18) includes a spring seat (181) installed in the cylinder head (17), an on / off valve (183) slidably placed in the cylinder head (17), a fixing ring (184) fixed below the cylinder head (17) to limit the downward position of the on / off valve (183), and an on / off compression spring (182) disposed between the spring seat (181) and the on / off valve (183). The outer surface of the on / off valve (183) is... The side is provided with sealing ring three (185) and sealing ring four (186). The sealing ring three (185) forms a valve chamber (187) between the opening and closing valve (183) and the cylinder head (17). The lower part of the opening and closing valve (183) is provided with sealing ring five (188). The opening and closing valve (183) is also machined with an exhaust channel (1831). The cylinder head (17) is formed with an exhaust hole one (171) corresponding to the exhaust channel (1831). The outer side of the fixing ring (184) is provided with sealing ring six (189). The sealing ring six (189) is used to achieve assembly sealing between the fixing ring (184) and the inner cylinder (102).

5. The improved efficiency nailing device for wooden pallets according to claim 4, characterized in that: The cylinder head (17) is also provided with an air intake connector (20), a first connector (21), and a second connector (22). The air intake connector (20) is connected to a high-pressure gas source to supply high-pressure gas into the first air chamber (108). The first connector (21) is connected to the valve chamber (187) of the on / off valve and is connected to the nailing solenoid valve (19) through a pipeline. The second connector (22) is connected to the first air chamber (108) and is connected to the nailing solenoid valve (19) through a pipeline. The nailing solenoid valve (19) is a two-position three-normally open solenoid valve.

6. The improved efficiency nailing device for wooden pallets according to claim 4, characterized in that: The rotary cylinder (331) includes a cylinder housing (3311) and a rack piston (3312) that slides inside the cylinder housing (3311). The rotating shaft (3313) has teeth that mesh with the rack piston (3312). Both ends of the rotary cylinder (331) are connected to the nail supply solenoid valve (332) through pipelines. The nail-driving solenoid valve (19) is a three-position, five-position normally open solenoid valve. When the nail-driving solenoid valve (19) is working, the rotary cylinder (331) rotates by 180 degrees.

7. The improved efficiency nailing device for wooden pallets according to claim 6, characterized in that: The number of the firing pins (12) is three, and correspondingly, the number of the nail guide tube (31), the nail head (32), and the rotary cylinder (331) is also three.

8. The improved efficiency nailing device for wooden pallets according to claim 7, characterized in that: The nail supply module (300) further includes an upper nail head fixing block (35), a lower nail head fixing block (37), and a connecting rod (36) that connect the three nail heads (32) into a whole. The connecting rod (36) is fixedly connected to the upper nail head fixing block (35) and the lower nail head fixing block (37) by connecting screws, so that the nail head (32) is limited between the upper nail head fixing block (35) and the lower nail head fixing block (37). The upper nail head fixing block (35) is fixedly connected to the air storage cylinder (10) by connecting screws.

9. The improved efficiency nailing device for wooden pallets according to claim 5, characterized in that: The cylinder head (17) is also provided with a fixing seat (23) for fixing the nail guide tube (31), and the cylinder head (17) is also provided with an exhaust cover (24), on which an exhaust hole (241) is machined.

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