Bulk nail nailing device with improved efficiency for wooden tray

Abstract

An efficiency-improved loose nail nailing device for a wooden tray comprises a nailing module and a nail supply module, the nailing module comprises an air storage cylinder, a piston arranged in the air storage cylinder and sliding in a reciprocating mode, and two or three firing pins connected to the end face of the piston and used for striking nails to achieve nailing operation. The nail supply module comprises nail inlet guide pipes, nail heads and nail transfer assemblies arranged between the nail inlet guide pipes and the nail heads, the number of the nail inlet guide pipes and the number of the nail heads are kept the same as that of the firing pins, nail outlet channels of the nail heads and the moving path of the firing pins are arranged on the same straight line, and magnets capable of adsorbing nails are arranged on the side wall faces, on the nail outlet channels, of the nail heads; the structural design of the nail supply module is more compact and reasonable; in the nailing module, the number and the positions of firing pins can be adjusted according to needs, various types of nailing patterns can be formed, and the adjusting process is very convenient and rapid; and during nailing operation, a plurality of nails are synchronously nailed into the foot blocks of the wooden tray, so that the overall working efficiency is higher.

Description

Technical Field

[0001] The invention relates to a loose nailing device for a wooden pallet with improved efficiency. Background Art

[0002] The applicant has been committed to the research and development of a loose nail nailing device for wooden pallets. The application publication number is CN117162205A, and the name is a loose nail nailing device for wooden pallets, which is the applicant's prior patent application. As mentioned in the background technology part of the patent scheme, "usually, two or three nails need to be driven into a single foot block of a wooden pallet. Fig. 9 The figure shows the situation of driving two nails. Fig.10 The figure shows the situation of driving three nails. In this scheme, the nail driving assembly can only drive one nail at a time, and then the driving motor adjusts the rotation angle of the large gear to adjust the position of the nail head so as to drive the next nail.

[0003] In the technical solution with application publication number CN117162205A, the driving of nails is completed in steps, and the efficiency needs to be further improved. Summary of the invention

[0004] In view of the shortcomings existing in the above problems, the present invention provides a loose nailing device for a wooden pallet with improved efficiency.

[0005] To achieve the above object, the present invention provides a loose nailing device for a wooden pallet with improved efficiency, comprising: A nailing module, the nailing module comprising an air storage cylinder, a piston disposed in the air storage cylinder for reciprocating sliding, and two or three strikers connected to the end surface of the piston for striking the nails to realize the nailing operation; A nail feeding module, the nail feeding module comprising a nail feeding guide tube, a nail head and a nail transfer assembly arranged between the nail feeding guide tube and the nail head, the number of the nail feeding guide tube and the nail head are the same as the number of the striker, the nail outlet channel of the nail head and the moving path of the striker are arranged in a straight line, and the nail head is provided with a magnet capable of attracting nails on the side wall surface of the nail outlet channel; The nail transfer assembly includes a rotating cylinder connected between the nail feed guide tube and the nail head, a nail supply solenoid valve for controlling the rotation of the rotating cylinder, and a nail guide plate. The nail guide plate is fixedly connected to the rotating shaft of the rotating cylinder, and a nail accommodating groove for accommodating nails is formed on the plate surface of the nail guide plate.

[0006] Furthermore, the air storage cylinder includes an outer cylinder, an inner cylinder, a front end cover, a rear end cover and a plurality of sealing rings, the outer cylinder, the inner cylinder, the front end cover and the rear end cover are connected to form a whole by screws and nuts, a first air chamber is formed between the outer cylinder and the inner cylinder, and a first air hole is processed on the wall surface of the inner cylinder; the piston includes a piston cylinder, a piston front cover connected to both ends of the piston cylinder, a piston rear cover, a sealing ring and a guide ring arranged on the wall surface of the piston cylinder, a small diameter section is formed in the middle part of the piston cylinder, and a second air hole is processed on the upper part of the small diameter section of the piston cylinder. When assembled, a second air chamber is formed between the small diameter section and the inner cylinder, and the first air chamber is connected to the piston inner cavity of the piston through the first air hole, the second air chamber and the second air hole.

[0007] Furthermore, a striker fixing block is fixedly connected to the piston front cover, and a plurality of through holes are formed on the striker fixing block for the striker to be installed. The striker passes through the through holes and is arranged on the piston front cover by the elastic force of the compression spring, so that the number and position of the striker can be adjusted as needed.

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

[0009] Furthermore, the nailing module also includes a cylinder head connected to the upper end of the gas storage cylinder, an opening and closing valve assembly installed in the cylinder head, and a nailing solenoid valve for realizing nailing control, the opening and closing valve assembly includes a spring seat installed in the cylinder head, an opening and closing valve slidably placed in the cylinder head, a fixing ring fixedly connected to the bottom of the cylinder head for limiting the downward position of the opening and closing valve, and an opening and closing compression spring arranged between the spring seat and the opening and closing valve, and the outer side of the opening and closing valve is provided with a sealing ring 1 and a sealing ring 2, and the sealing ring 1 forms an opening and closing valve cavity between the opening and closing valve and the cylinder head, and the lower part of the opening and closing valve is provided with a sealing ring 3, and the opening and closing valve is also processed with an exhaust channel, and the cylinder head is formed with an exhaust hole 1 corresponding to the exhaust channel, and the outer side of the fixing ring is provided with a sealing ring 4, and the sealing ring 4 is used to realize the assembly seal between the fixing ring and the inner cylinder.

[0010] Furthermore, the cylinder head is also provided with an air intake joint, a first joint, and a second joint. The air intake joint is connected to a high-pressure gas source for supplying high-pressure gas into the first air chamber. The first joint is communicated with the valve cavity of the opening and closing valve and is connected to the nailing solenoid valve through a pipeline. The second joint is communicated with the first air chamber and is connected to the nailing solenoid valve through a pipeline. The nailing solenoid valve uses a two-position, three-way normally open solenoid valve.

[0011] Furthermore, the rotating cylinder includes a cylinder housing and a rack piston slidably disposed in the cylinder housing. A tooth portion meshing with the rack piston is formed on the rotating shaft. Both ends of the rotating cylinder are connected to the nail supply solenoid valve through pipelines. The nailing solenoid valve uses a three-position, five-position normally open solenoid valve. When the nailing solenoid valve is working, the rotation angle of the rotating cylinder is 180 degrees.

[0012] Furthermore, the number of the firing pins is three, and correspondingly, the number of the nail feed guide tubes, the nail heads, and the rotating cylinders 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 heads are 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 provided with a fixing seat for fixing the nail feeding guide tube, and the cylinder head is also provided with an exhaust cover, and the exhaust cover is processed to form an exhaust hole 2.

[0015] The beneficial effects of the present invention compared to the prior art are: 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 striker can be adjusted as needed to form a variety of nailing patterns, and the adjustment process is also very convenient and quick; 3. During the nailing operation, multiple nails are driven into the foot blocks of the wooden pallet simultaneously, which increases the overall work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a loose nailing device for a wooden pallet with improved efficiency; Figure 2 A cross-sectional view of a loose nailing device for a wooden pallet with improved efficiency; Figure 3 An exploded view of a loose nailing device for a wooden pallet with improved efficiency; Figure 4 for Figure 3 An exploded view of the nail supply module in FIG. Figure 5 for Figure 3 A cross-sectional view of a nail supply module in FIG. Figure 6 is a distribution diagram of the nail guide plates involved; Figure 7 It is a connection diagram of the rotary cylinder and nail supply solenoid valve involved; Figure 8 is a cross-sectional view of the gas storage cylinder involved; Fig. 9 is a cross-sectional view of the piston involved; Fig.10 is a schematic diagram of the piston and striker fixing block involved; Fig.11 is a schematic diagram of the cylinder head and the opening and closing valve assembly involved; Fig.12 A three-dimensional diagram of the cylinder head and the opening and closing valve assembly involved; Fig.13 A nailing pattern for illustration (three nails in the same circle); Fig.14 A nailing pattern for illustration (the three nails are not in the same circle); Fig.15 A nailing pattern for illustration (two nails in a straight line); Fig.16 Indication for nailing operation Figure 1 (initial state); Fig.17 Indication for nailing operation Figure 2 (Finish the nail supply); Fig.18 Indication for nailing operation Figure 3 (to achieve nailing); Fig.19 Indication for nailing operation Figure 4 (Piston reset).

[0017] In the figure: 100. Nailing module; 10. Air storage cylinder; 101. Outer cylinder; 102. Inner cylinder; 1021. Air hole 1; 103. Front cover; 104. Rear cover; 105. Sealing ring; 106. Screw; 107. Nut; 108. First air chamber; 109. Inner cavity of inner cylinder; 11. Piston; 111. Piston cylinder; 1111. Small diameter section; 1112. Air hole 2; 112. Piston front cover; 113. Piston rear cover; 114. Sealing ring; 115. Guide ring; 116. Piston cavity; 117. Second air chamber; 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 hole 1; 18. Open and close valve assembly; 181. Spring seat; 182. Open and close compression spring; 183. Open and close valve; 1831. Exhaust channel; 184. Fixing ring; 185. Sealing ring 1; 186. Sealing ring 2; 187. Open and close valve cavity; 188. Sealing ring 3; 189. Sealing ring 4; 19. Nail solenoid valve; 20. Inlet connector; 21. First connector; 22. Second connector; 23. Fixing seat; 24. Exhaust cover; 241. Exhaust hole 2; 25. Guide slider assembly; 200. Nails; 300, nail supply module; 31. nail feeding guide tube; 32. nail head; 321. nail outlet channel; 33. nail transfer assembly; 331. rotary cylinder; 3311. cylinder housing; 3312. rack piston; 3313. rotating shaft; 332. nail supply solenoid valve; 333. nail guide plate; 3331. nail receiving groove; 34. magnet; 35. Upper nail head fixing block; 36. Connecting rod; 37. Lower nail head fixing block; 400, foot block; 500. Tablet. DETAILED DESCRIPTION

[0018] like Figures 1 to 7As shown, an efficient loose nail nailing device for wooden pallets according to an embodiment of the present invention comprises a nailing module 100 and a nail supply module 300; the nailing module 100 comprises an air storage cylinder 10, a piston 11 disposed in the air storage cylinder 10 for reciprocating sliding, and a striker 12 connected to the end surface of the piston 11 for three striking nails 200 for nailing operation; the nail supply module 300 comprises a nail feed guide tube 31, a nail head 32 and a nail transfer assembly 33 arranged between the nail feed guide tube 31 and the nail head 32, the number of the nail feed guide tube 31 and the nail head 32 are the same as the striker 12, and the upper end of the nail feed guide tube 31 is connected to the vibration plate to realize orderly feeding, and the nail head 32 The nail outlet channel 321 is arranged in a straight line with the moving path of the striker 12, and the nail head 32 is provided with a magnet 34 capable of adsorbing the nail 200 on the side wall surface of the nail outlet channel 321. In the figure, there are two magnets 34 for adsorbing one nail 200; the nail transfer assembly 33 includes a rotating cylinder 331 connected between the nail feed guide tube 31 and the nail head 32, a nail supply solenoid valve 332 for controlling the rotation of the rotating cylinder 331, and a nail guide plate 333. The nail guide plate 333 is fixedly connected to the rotating shaft 3313 of the rotating cylinder 331, and a nail receiving groove 3331 for accommodating the nail 200 is formed on the plate surface of the nail guide plate 333. The nail receiving groove 3331 is shown in FIG. Figure 6 ; Combination Figure 5 , Figure 7 The rotary cylinder 331 includes a cylinder housing 3311, a rack piston 3312 slidably disposed in the cylinder housing 3311, and a toothed portion meshing with the rack piston 3312 is formed on the rotary shaft 3313. Both ends of the rotary cylinder 331 are connected to the nail supply solenoid valve 332 through a pipeline. The nailing solenoid valve 19 uses a three-position five-position normally open solenoid valve. When the nailing solenoid valve 19 is working, the rotation angle of the rotary cylinder 331 is 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 the three nail heads 32 to form an integral body. 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 gas storage cylinder 10 by connecting screws; See also Figure 8 The gas storage cylinder 10 includes an outer cylinder 101, an inner cylinder 102, a front cover 103, a rear cover 104 and a plurality of sealing rings 105. The outer cylinder 101, the inner cylinder 102, the front cover 103 and the rear cover 104 are connected to form a whole by a screw 106 and a nut 107. A first air chamber 108 is formed between the outer cylinder 101 and the inner cylinder 102. An air hole 1021 is processed on the wall surface of the inner cylinder 102. See also Fig. 9 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, a sealing ring 114 and a guide ring 115 arranged on the wall surface of the piston cylinder 111, a small diameter section 1111 is formed in the middle of the piston cylinder 111, and the piston cylinder 111 is processed with a second air hole 1112 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, and the first air chamber 108 is connected to the piston inner cavity 116 of the piston 11 through the air hole 1021, the second air chamber 117, and the air hole 1112. The second air chamber 117 formed between the small diameter section 1111 and the inner cylinder 102 is as shown in FIG. Figure 2 As shown; See also Fig. 9 , Fig.10 A striker fixing block 13 is fixedly connected to the piston front cover 112, and a plurality of through holes 131 are formed on the striker fixing block 13 for the striker 12 to be installed. The striker 12 passes through the through holes 131 and is arranged on the piston front cover 112 by the elastic force of the compression spring 14, so that the number and position of the striker 12 can be adjusted as needed; Figures 13-15 All of them are illustrative nailing patterns, but the nailing patterns are not limited to the above three types; the piston front cover 112 is also provided with a buffer pad 15 and a guide pin 16, and the guide pin 16 is also provided on the piston front cover 112 by the elastic force of the compression spring 14; See also Fig.11 , Fig.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 realizing 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 fixedly connected to the bottom of the cylinder head 17 for limiting the downward position of the on-off valve 183, and an on-off compression spring 182 arranged between the spring seat 181 and the on-off valve 183. The outer side of the on-off valve 183 is provided with a sealing ring 185 and a sealing ring 186. The sealing ring 185 makes the on-off valve An on-off valve cavity 187 is formed between the on-off valve 183 and the cylinder head 17. A sealing ring 3 188 is disposed at the lower part of the on-off valve 183. An exhaust passage 1831 is also processed 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 4 189 is disposed on the outer side of the fixing ring 184. The sealing ring 4 189 is used to achieve assembly sealing between the fixing ring 184 and the inner cylinder 102. A fixing seat 23 for fixing and installing the nail guide tube 31 is also provided on the cylinder head 17. An exhaust cover 24 is also provided on the cylinder head 17. An exhaust hole 241 is processed and formed on the exhaust cover 24. Combination Figure 1 , Fig.11 , Fig.12 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 for supplying high-pressure gas into the first air chamber 108. The first connector 21 is communicated with the opening and closing valve cavity 187 and is connected to the nailing solenoid valve 19 through a pipeline. The second connector 22 is communicated with the first air chamber 108 and is connected to the nailing solenoid valve 19 through a pipeline. The nailing solenoid valve 19 uses a two-position, three-way normally open solenoid valve.

[0019] The structural design of the nail supply module is more compact and reasonable; in the nailing module, the number and position of the striker can be adjusted according to needs to form a variety of nailing patterns, and the adjustment process is also very convenient and fast; during the nailing operation, multiple nails are driven into the foot blocks of the wooden pallet simultaneously, and the overall work efficiency is higher.

[0020] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use; Figures 16 to 19 A schematic diagram of a nailing cycle of the device; See also Fig.16 , this is the initial state. In the initial state, the air inlet connector 20 supplies high-pressure gas into the first air chamber 108, and the high-pressure gas passes through the air hole 1 1021 of the inner cylinder 102, the second air chamber 117, and the air hole 2 1112 in turn to reach the inner cylinder cavity 116, that is, it 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 nailing solenoid valve 19, and the first connector 21 to the opening and closing valve cavity 187, that is, it is manifested as high pressure at the opening and closing valve cavity 187; because at this time, the exhaust channel 1831 is connected to the atmosphere, that is, the inside of the inner cylinder cavity 109 and the upper position 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 moves downward to be close to the fixing ring 184 and is sealed by the sealing ring 3 188; there is no nail 200 at the nail outlet channel 321 of the nail head 32.

[0021] See also Fig.17 At this time, the nail supply has been completed, that is, there is a nail 200 at the nail outlet channel 321 of the nail head 32; the nail supply process is as follows: the nail supply solenoid valve 332 is actuated, and the rack piston 3312 is moved by switching the direction of the air path, and the movement of the rack piston 3312 is converted into the rotation of the rotating shaft 3313, and the nail guide plate 333 rotates synchronously with the rotating shaft 3313, that is, the nail 200 at the nail accommodating groove 3331 of the nail guide plate 333 is rotated 180 degrees by the action of the nail supply solenoid valve 332, and then, the nail 200 is attracted by the magnet 34 at the nail outlet channel 321, that is, the nail supply process is realized, and then, the nail supply solenoid valve 332 is reset to prepare for the next nail supply process.

[0022] See also Fig.18, this is the nailing process. During nailing, the nailing solenoid valve 19 is actuated, 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 is manifested as normal pressure in the valve chamber 187 of the opening and closing valve, and 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 compression spring 182 and move upward, so that a gap is formed between the opening and closing valve 183 and the fixing ring 184, and 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 and causes the piston 11 to move downward, that is, the high-speed movement of the striker 12 ejects the nail 200 adsorbed by the magnet 34 at the nail outlet channel 321, and the ejected nail 200 is driven into the flat plate 400 and the foot block 500, thereby realizing the fixed connection between the flat plate 400 and the foot block 500.

[0023] See also Fig.19 At this time, the piston is reset. The specific process is that the nailing solenoid valve 19 is reset, and the second joint 22 supplies high-pressure gas to the opening and closing valve cavity 187 through the nailing solenoid valve 19 and the first joint 21 again. The opening and closing valve cavity 187 is in a high-pressure state, and the opening and closing valve 183 is subjected to the gas pressure and the elastic force of the opening and closing compression spring 182. The opening and closing valve 183 moves downward and is tightly attached to the fixing ring 184 and is sealed by the sealing ring three 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 an upward reset process. During the reset, the gas in the inner cylinder cavity 109 on the upper part of 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] Also, see Fig.18 At this time, the piston 11 reaches the lower stop position (i.e., the lowest position) of the gas cylinder 10. In this state, the nailing module 100 is completely removed from the nail supply module 300, and then the striker fixing block 13 is removed, and the number of strikers and the relative positions between the multiple strikers can be adjusted as needed, so that the device can meet the actual needs of various nailing patterns; in order 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 gas cylinder 10, and the quick disassembly and assembly of the gas cylinder 10 is achieved through the cooperation of the guide slider assembly 25 and the frame; of course, the piston 11 is at the upper stop position (i.e., the highest position) of the gas cylinder 10, and the nailing module 100 can also be completely removed from the nail supply module 300, and then the nailing solenoid valve 19 controls the piston 11 to reach the lower stop position (i.e., the lowest position) of the gas cylinder 10, and then the striker fixing block 13 is removed, and the number of strikers and the relative positions between the multiple strikers can be adjusted as needed, so that the device can meet the actual needs of various nailing patterns.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A loose nailing device for wooden pallets with improved efficiency, characterized in that: include A nailing module (100), the nailing module (100) comprising an air storage cylinder (10), a piston (11) disposed in the air storage cylinder (10) and sliding back and forth, and two or three strikers (12) connected to the end surface of the piston (11) for striking nails (200) to achieve nailing operations; A nail supply module (300), the nail supply module (300) comprising a nail feed guide tube (31), a nail head (32), and a nail transfer assembly (33) arranged between the nail feed guide tube (31) and the nail head (32), the number of the nail feed guide tube (31) and the nail head (32) being the same as the number of the striker (12), the nail outlet channel (321) of the nail head (32) being arranged on a straight line with the moving path of the striker (12), and the nail head (32) being provided with a magnet (34) capable of attracting the nail (200) on the side wall surface of the nail outlet channel (321); The nail transfer assembly (33) comprises a rotary cylinder (331) connected between the nail feed guide tube (31) and the nail head (32), a nail supply 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 rotating shaft (3313) of the rotary cylinder (331), and a nail receiving groove (3331) for receiving the nail (200) is formed on the plate surface of the nail guide plate (333).

2. The loose nailing device for wooden pallets with improved efficiency according to claim 1, characterized in that: The gas storage cylinder (10) comprises an outer cylinder (101), an inner cylinder (102), a front end cover (103), a rear end cover (104) and a plurality of sealing rings (105); the outer cylinder (101), the inner cylinder (102), the front end cover (103) and the rear end cover (104) are connected to form a whole by a screw (106) and a nut (107); a first air chamber (108) is formed between the outer cylinder (101) and the inner cylinder (102); a gas hole (1021) is processed on the wall surface of the inner cylinder (102); the piston (11) comprises a piston cylinder (111), a piston front cover (112) connected to both ends of the piston cylinder (111), a piston rear cover (113), a sealing ring (114) and a guide ring (115) arranged on the wall surface of the piston cylinder (111); the piston cylinder (111) A small diameter section (1111) is formed in the middle, and a second air hole (1112) is processed on the upper part of the small diameter section (1111) of the piston cylinder (111). When assembled, a second air chamber (117) is formed between the small diameter section (1111) and the inner cylinder (102), and the first air chamber (108) is connected to 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).

3. The loose nailing device for wooden pallets with improved efficiency according to claim 2, characterized in that: A striker fixing block (13) is fixedly connected to the piston front cover (112), and a plurality of through holes (131) are formed on the striker fixing block (13) for the striker (12) to be installed therethrough. The striker (12) passes through the through holes (131) and is arranged on the piston front cover (112) by the elastic force of a compression spring (14), thereby achieving that the number and position of the striker (12) can be adjusted as required.

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

5. The loose nailing device for wooden pallets with improved efficiency according to claim 2, characterized in that: The nailing module (100) further comprises 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 realizing nailing control, wherein the on-off valve assembly (18) comprises a spring seat (181) installed in the cylinder head (17), an on-off valve (183) slidably disposed in the cylinder head (17), a fixing ring (184) fixedly connected to the bottom of the cylinder head (17) for limiting the downward position of the on-off valve (183), an on-off compression spring (182) arranged between the spring seat (181) and the on-off valve (183), and an outer ring (184) of the on-off valve (183) for locking the on-off valve (183). The side of the cylinder head (17) is provided with a sealing ring 1 (185) and a sealing ring 2 (186), the sealing ring 1 (185) forms an on-off valve cavity (187) between the on-off valve (183) and the cylinder head (17), the lower part of the on-off valve (183) is provided with a sealing ring 3 (188), the on-off valve (183) is also provided with an exhaust passage (1831), the cylinder head (17) is provided with an exhaust hole 1 (171) corresponding to the exhaust passage (1831), the outer side of the fixing ring (184) is provided with a sealing ring 4 (189), the sealing ring 4 (189) is used to achieve assembly sealing between the fixing ring (184) and the inner cylinder (102).

6. The loose nailing device for wooden pallets with improved efficiency according to claim 5, 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 for supplying high-pressure gas into the first air chamber (108); the first connector (21) is communicated with the opening and closing valve cavity (187) and is connected to the nailing solenoid valve (19) through a pipeline; the second connector (22) is communicated with 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-way normally open solenoid valve.

7. The loose nailing device for wooden pallets with improved efficiency according to claim 1, characterized in that: The rotary cylinder (331) comprises a cylinder housing (3311) and a rack piston (3312) slidably disposed in the cylinder housing (3311); a toothed portion meshing with the rack piston (3312) is formed on the rotary shaft (3313); both ends of the rotary cylinder (331) are connected to the nail supply solenoid valve (332) via 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 in operation, the rotation angle of the rotary cylinder (331) is 180 degrees.

8. The loose nailing device for wooden pallets with improved efficiency according to claim 7, characterized in that: The number of the strikers (12) is three, and correspondingly, the number of the nail feeding guide tubes (31), the nail heads (32), and the rotating cylinders (331) are all three.

9. The loose nailing device for wooden pallets with improved efficiency according to claim 8, characterized in that: The nail supply module (300) further comprises an upper nail head fixing block (35), a lower nail head fixing block (37), and a connecting rod (36) for connecting the three nail heads (32) to form an integral 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 means of connecting screws, so that the nail heads (32) are 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 gas storage cylinder (10) by means of connecting screws.

10. The loose nailing device for wooden pallets with improved efficiency according to claim 6, characterized in that: The cylinder head (17) is also provided with a fixing seat (23) for fixing the nail feeding guide tube (31). The cylinder head (17) is also provided with an exhaust cover (24), and the exhaust cover (24) is machined to form an exhaust hole 2 (241).

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