Straight handle type valveless pressurizing air shovel

Abstract

The utility model discloses a straight handle type valveless pressurizing air shovel, which comprises a handle, a connecting pipe, a cylinder body, a hammer body, a front body, a shovel head and the like, and is mainly characterized in that the handle consists of a switch sleeve arranged at the upper part of the connecting pipe and a handle body arranged at the upper part of the switch sleeve; the switch sleeve, the handle body, the connecting pipe, the cylinder body and the front body are all located on the same axis to form a straight handle type handle, and an air inlet switch in the handle body is used for controlling communication and opening and closing of an air inlet connector on the handle body and a connecting cavity in the switch sleeve; obviously, the appearance of the straight handle type handle is simpler, the assembly of the air inlet switch is facilitated, the installation structure is more compact, and the air leakage risk is avoided; meanwhile, the packaging size is reduced due to the simple appearance, and transportation and storage are facilitated; besides, the upper end of the shovel head is clamped in the front body and axially reciprocates up and down through a plurality of pit slots designed on the outer circumferential surface, and the shovel head with the pit slots can be universal with an electric hammer, so that the application range of the shovel head is greatly expanded.

Description

Technical Field

[0001] The utility model relates to an air shovel, in particular to a straight-handled valveless pressurized air shovel. Background Art

[0002] The air shovel is a pneumatic impact tool that uses impact to dig soil, trees, and dig trenches in gardening and farming operations. It can also be used for shoveling walls and ground in decoration operations, or for small-area concrete crushing, foundation compaction, and drilling and punching in municipal engineering. It can also be used for sand removal of various castings and shoveling and trimming of metal material surfaces. At present, the structure of an air shovel is usually composed of a connecting pipe, a handle installed on the upper part of the connecting pipe, a cylinder installed on the lower part of the connecting pipe, a front body installed on the lower part of the cylinder body, a hammer body arranged in the cylinder body and the front body, etc. The upper end of the hammer body is axially reciprocating and sealed and inserted in the cylinder body, and the lower part of the front body is provided with a shovel head axially movable and inserted, so the impact work can be achieved by the hammer hitting the shovel head; wherein, the handle is usually designed to be a T-shaped or ring-shaped with a complex appearance style. Although it has a certain aesthetic appearance, it is easy to cause the complexity of the air intake route design in the handle, which is not conducive to the assembly of the air intake switch in the handle, and there is also a greater risk of air leakage; at the same time, the complex handle shape also brings inconvenience to packaging, often occupies a larger packaging volume, which is not conducive to transportation and storage; in addition, the upper end of the shovel head used in the existing air shovel is clamped and axially reciprocated up and down through a wide ring groove, so it cannot be used interchangeably with the shovel head of an electric hammer, resulting in a limited scope of use. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a straight-handled valveless pressurized air shovel with a compact structure, simple appearance and an applicable shovel head that can form a universal straight-handled valveless pressurized air shovel with an electric hammer.

[0004] The technical problem of the utility model is achieved through the following technical solutions:

[0005] A straight-handled valveless booster air shovel comprises a connecting pipe, a handle mounted on the upper part of the connecting pipe, a cylinder body mounted on the lower part of the connecting pipe and a front body mounted on the lower part of the cylinder body; a hammer body is arranged in the cylinder body and the front body, the upper end of the hammer body is axially reciprocatingly sealed and inserted in the cylinder body, the lower part of the front body is provided with an axially movable shovel head, the handle is composed of a switch sleeve mounted on the upper part of the connecting pipe and a handle body mounted on the upper part of the switch sleeve, the switch sleeve, the handle body, the connecting pipe, the cylinder body and the front body are all on the same axial line, and the handle forms a straight-handled handle; a connecting cavity is arranged in the switch sleeve, an air inlet joint is arranged on the top of the handle body, an air inlet switch is arranged in the handle body, and the opening and closing of the connection between the air inlet joint and the connecting cavity are controlled by the air inlet switch.

[0006] The handle body is provided with a transverse hole, an oblique hole arranged above the transverse hole, and vertical holes respectively connected to the transverse hole and the connecting cavity; the air inlet joint is sealably inserted in the oblique hole and directly connected to the transverse hole.

[0007] The air intake switch includes a push rod that is movably sealed and arranged in a transverse hole. The outer end of the push rod is elastically pushed outward and extends out of the transverse hole to contact a pressure handle. A valve pad is provided at the inner end of the push rod. The pressure handle presses the push rod to move inward and drives the valve pad to open the transverse hole, or the push rod is elastically pushed outward to reset and drives the valve pad to close the transverse hole.

[0008] An inner shoulder is provided in the middle of the transverse hole, and the inner shoulder divides the transverse hole into a left hole and a right hole. The push rod movable seal is arranged in the left hole, and the inner end of the push rod extends into the right hole and is provided with a valve pad. The right hole is provided with a valve spring that elastically pushes the push rod outward. The push rod moves axially inward and outward, and drives the valve pad to separate from the inner shoulder to open the transverse hole or contact the inner shoulder to close the transverse hole.

[0009] A sealed air inlet seat is provided on the upper part of the cylinder body, an upper cavity is formed in the cylinder body between the air inlet seat and the upper end of the hammer body, a lower cavity is formed between the outer wall of the hammer body and the inner wall of the cylinder body, and an air outlet cavity is formed between the hammer body and the front body; a cylinder air passage connected to the lower cavity is provided in the cylinder body, and an air inlet hole connected to the air inlet cavity in the connecting pipe and the cylinder air passage is provided on the air inlet seat; an air outlet blind hole connected to the upper cavity is provided in the hammer body, and an air outlet hole connected to the air outlet blind hole is provided on one side of the hammer body, and the air outlet hole is connected to the air outlet cavity or the lower cavity under the axial reciprocating movement of the hammer body; an exhaust hole connected to the air outlet cavity and the outside atmosphere is provided on one side of the front body.

[0010] A connecting sleeve connected to each other is arranged between the connecting pipe and the cylinder body, and the upper end of the front body is threadedly connected to the lower end of the cylinder body.

[0011] An axially through mounting hole is provided in the front body, and a side hole connected to the mounting hole is provided on one side of the front body, and a ball head roller is provided in the side hole; an end sleeve with a movable sleeve is provided at the lower part of the front body, and a convex portion and a concave portion are provided on the inner wall of the end sleeve; the end sleeve moves upward to drive the concave portion to face the ball head roller, and the ball head roller retracts into the side hole, and the upper end of the shovel head is inserted into the mounting hole or detached from the mounting hole; the end sleeve moves downward to drive the convex portion to push the ball head roller, and the ball head roller extends out of the side hole to lock the upper end of the shovel head.

[0012] A plurality of grooves evenly distributed around the circumference are arranged on the outer circumferential surface of the upper end of the shovel head. The ball head roller extends out of the side hole and is fitted in the groove to lock the upper end of the shovel head.

[0013] The pit is a waist-shaped groove extending axially, the length of which must be larger than the diameter of the side hole, and the ball head roller must have a travel distance for axial up and down reciprocating movement in the pit.

[0014] The lower part of the front body is provided with a sleeve end sleeve compression spring, which elastically pushes the end sleeve downward, thereby driving the convex part to push the ball head roller; the front body is provided with a shaft retaining ring for fixing the lower end position of the end sleeve.

[0015] Compared with the prior art, the utility model mainly designs the handle to be composed of a switch sleeve installed on the upper part of the connecting tube and a handle body installed on the upper part of the switch sleeve, and makes the switch sleeve, the handle body, the connecting tube, the cylinder body and the front body all on the same axial line, so that the handle forms a straight handle; and, a connecting cavity is provided in the switch sleeve, and an air inlet joint is provided on the top of the handle body, and the air inlet switch is directly designed in the handle body, so as to control the opening and closing of the connection between the air inlet joint and the connecting cavity; obviously, the appearance of this straight handle is simpler, which facilitates the assembly of the air inlet switch, and the installation structure is also more compact, avoiding the risk of air leakage; at the same time, the simple appearance reduces the packaging volume, which is convenient for transportation and storage; in addition, the upper end of the shovel head realizes the positioning in the front body and the axial up and down reciprocating movement through a plurality of circumferentially evenly distributed pits designed on the outer circumferential surface, and the shovel head with this pit design can also be compatible with the electric hammer, thereby greatly increasing the scope of use of the shovel head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 Enlarged cross-sectional view of the middle handle area.

[0018] Figure 3 for Figure 2 Cross-sectional view with the pressure handle, push rod and valve spring removed.

[0019] Figure 4 Schematic diagram of the structure of the push rod.

[0020] Figure 5 for Figure 1 Enlarged cross-sectional view of the handle removed.

[0021] Figure 6 It is an enlarged cross-sectional view of the precursor.

[0022] Figure 7 This is an enlarged cross-sectional view of the end sleeve.

[0023] Figure 8 It is a schematic diagram of the structure of the shovel head.

[0024] Fig. 9 for Figure 8 Left view of . DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be described in detail below according to the above-mentioned drawings.

[0026] like Figure 1 to Figure 9 As shown, 1. handle, 11. switch sleeve, 12. handle body, 13. oblique hole, 14. vertical hole, 15. horizontal hole, 151. left hole, 152. right hole, 153. inner shoulder, 2. intake switch, 21. push rod, 211. valve pad, 212. ball head end, 22. pressure handle, 23. valve spring, 24. screw plug, 3. connecting pipe, 31. connecting sleeve, 4. intake seat, 5. hammer body, 6. cylinder body, 7. front body, 71. mounting hole, 72. side hole, 7 3. Ball head roller, 74. End sleeve compression spring, 75. Guide rib, 8. End sleeve, 81. Protrusion, 82. Concave portion, 9. Shovel head, 91. Groove, 92. Guide groove, 10. Shaft retaining ring, 101. Inlet joint, 102. Connecting cavity, 103. Inlet cavity, 104. Inlet hole, 105. Cylinder channel, 106. Lower cavity, 107. Upper cavity, 108. Outlet blind hole, 109. Outlet hole, 110. Outlet cavity, 111. Exhaust hole.

[0027] A straight handle valveless booster air shovel, such as Figure 1 As shown, it relates to a pneumatic impact tool that uses input high-pressure gas through a specially designed air intake system to push the hammer body 5 to make axial reciprocating movement and then continuously impact the shovel head 9 to work. It can be equipped with various shovel heads 9 according to actual use needs, and is used in a percussion manner for digging, ditching, digging and planting greening, harvesting trees and some crops in various lands in gardening and farming operations, or shoveling walls and ground in decoration operations, shoveling away excess glue and asphalt in the decoration process, or used for small-area concrete crushing, foundation tamping, grooving, drilling, perforating, etc. in municipal engineering, or sand cleaning of various castings, shoveling and trimming of metal material surfaces.

[0028] The air shovel structure is mainly composed of a handle 1, a connecting pipe 3, a cylinder body 6 and a front body 7 which are connected in sequence.

[0029] The handle 1 is composed of a switch sleeve 11 installed on the upper part of the connecting tube 3 and a handle body 12 installed on the upper part of the switch sleeve. The switch sleeve 11, the handle body 12, the connecting tube 3, the cylinder body 6 and the front body 7 are all on the same axis, so that the handle 1 forms a straight handle.

[0030] The switch sleeve 11 is provided with a connecting cavity 102; the handle body 12 is provided with a transverse hole 15, an inclined hole 13 arranged above the transverse hole, and a vertical hole 14 respectively connecting the transverse hole 15 and the connecting cavity 102; the inclined hole 13 is provided with an air inlet connector 101 which is sealed and directly connected to the transverse hole 15 and can be used for externally connecting to an air inlet pipe to input high-pressure gas, that is, the top of the handle body 12 is provided with an air inlet connector 101, and the middle part of the transverse hole 15 is provided with an inner shoulder 153, and the transverse hole is divided into a left hole 151 and a right hole 152 by the inner shoulder.

[0031] The handle body 12 is provided with an air intake switch 2, and the air intake switch controls the opening and closing of the connection between the air intake connector 101 and the connecting chamber 102; the air intake switch 2 includes a push rod 21 that is movably sealed and arranged in the transverse hole 15, specifically, the push rod is movably sealed and arranged in the left hole 151, and the inner end of the push rod 21 extends into the right hole 152 and is provided with a valve pad 211, and a valve spring 23 that elastically pushes the push rod 21 outward is also provided in the right hole 152. In this embodiment, the right hole 152 penetrates the handle body 12 to the right so that the valve spring 23 can be installed, and then the penetration portion is sealed and closed by a screw plug 24. In this way, the outer end of the push rod 21 can be elastically pushed outward, that is, pushed to the left, and extend out of the transverse hole 15 and contact the pressing handle 22. The upper end of the pressing handle is hinged with the handle body 12 via the pin. In this way, the valve pad 211 can be driven to disengage from the inner shoulder 153 and open the transverse hole 15 by simply pressing the pressing handle 22 to move the push rod 21 inward, or the pressing force on the pressing handle 22 is released, and the push rod 21 is elastically pushed outward to move back to its original position, which can drive the valve pad 211 to contact the inner shoulder 153 to close the transverse hole 15. The outer end of the push rod 21 is set to a ball head end 212 to contact the pressing handle 22 to facilitate the pressing operation of the pressing handle.

[0032] Obviously, the straight handle has a simpler appearance, which facilitates the assembly of the air inlet switch 2, and the installation structure is also more compact, avoiding the risk of air leakage; at the same time, the simple appearance reduces the packaging volume and facilitates transportation and storage.

[0033] The connecting pipe 3 is a vertically arranged hollow lightweight aluminum alloy round pipe, so an air inlet cavity 103 is formed in the connecting pipe 3; the connecting pipe 3 and the cylinder body 6 are connected as a whole through a connecting sleeve 31, and the upper end of the front body 7 is directly threadedly connected to the lower end of the cylinder body 6; the cylinder body 6 and the front body 7 are axially connected, and an air inlet seat 4 is provided at the upper end of the cylinder body 6 for sealing installation through a sealing ring, and a hammer 5 is provided in the cylinder body 6 and the front body 7, and the upper end of the hammer moves axially back and forth. The dynamic seal is inserted in the cylinder body 6, and the lower end of the hammer body is located in the front body 7; therefore, an upper cavity 107 is formed in the cylinder body 6 between the air inlet seat 4 and the upper end of the hammer body 5, a lower cavity 106 is formed between the outer wall of the hammer body 5 and the inner wall of the cylinder body 6, and an air outlet cavity 110 is formed between the hammer body 5 and the front body 7. An exhaust hole 111 is also provided on one side of the front body 7, which is connected to the air outlet cavity 110 and the outside atmosphere respectively. The number of the exhaust holes can be 3 and is evenly distributed on the outer surface of the front body 7.

[0034] At the same time, a plurality of air inlet holes 104 are provided on the air inlet seat 4, and the number of the air inlet holes can be designed according to the size of the air inlet seat 4; a cylinder air duct 105 connected to the lower chamber 106 is provided in the cylinder body 6, and the cylinder air duct is connected to the corresponding setting positions of the air inlet holes 104, so the air inlet cavity 103 in the connecting pipe 3 and the cylinder air duct 105 can be connected respectively through the plurality of air inlet holes 104 on the air inlet seat 4.

[0035] In addition, the hammer body 5 is provided with a blind air outlet hole 108 extending along its axis, and the blind air outlet hole is directly connected to the upper cavity 107. One side of the hammer body 5 is provided with an air outlet hole 109 connected to the blind air outlet hole 108. The number of the air outlet holes is 3, and they are evenly distributed on the outer surface of the hammer body 5 with the blind air outlet hole 108 as the center.

[0036] The front body 7 is axially penetrated, so a mounting hole 71 is formed, and the upper end of the shovel head 9 can be inserted into or detached from the mounting hole 71. A guide rib 75 and a guide groove 92 for guiding the movement of the shovel head 9 are provided on the inner wall of the mounting hole and the outer surface of the upper end of the shovel head, so that the shovel head 9 after installation can only move axially and cannot rotate radially, and a plurality of circumferentially evenly distributed pits 91 are also provided on the outer circumferential surface of the upper end of the shovel head 9; one side of the front body 7 is provided with a connecting mounting hole 71. The side hole 72 of the hole 71 has a ball head roller 73 in the side hole; the lower part of the front body 7 is provided with a movable end sleeve 8 and an end sleeve compression spring 12, the inner wall of the end sleeve 8 is provided with a convex portion 81 and a concave portion 82, the end sleeve compression spring 12 always elastically pushes the end sleeve 8 downward under normal conditions, and then drives the convex portion 81 of the end sleeve to push the ball head roller 73, and the front body 7 is provided with a shaft retaining ring 10 for fixing the lower end position of the end sleeve 8 to prevent it from being pushed downward by the end sleeve compression spring 74 and detaching from the lower part of the front body 7.

[0037] The installation process of the shovel head 9 is as follows: first, external force is used to drive the end sleeve 8 to overcome the pushing elastic force of the end sleeve compression spring 74 and move upward, and make the recessed portion 82 face the ball roller 73. At this time, the ball roller can be retracted into the side hole 72, and the upper end of the shovel head 9 can be inserted into the mounting hole 71. Then, the external force on the end sleeve 8 is released, and the end sleeve compression spring 74 pushes the end sleeve 8 to move downward and pushes the ball roller 73 through the protrusion 81. The ball roller extends out of the side hole 72 and is mounted in the groove 91 on the outer cylindrical surface of the shovel head 9. At this time, the shovel head 9 will not detach from the mounting hole 71.

[0038] The length of the groove 91 must be greater than the diameter of the side hole 72 so that the ball roller 73 has a travel distance for axial up and down reciprocating movement in the groove 91. When the shovel head 9 does not detach, the hammer body 5 can continue to hit the shovel head 9 to cause it to produce a high-frequency telescopic movement, thereby achieving the working purpose.

[0039] From the structural description of the air shovel, it can be seen that the air intake system is mainly composed of an air intake joint 101, an inclined hole 13, a horizontal hole 15, a vertical hole 14, a connecting chamber 102, an air intake chamber 103, an air intake hole 104, a cylinder air passage 105, an upper chamber 107, a lower chamber 106, an air outlet blind hole 108, an air outlet hole 109, an air outlet chamber 110 and an air outlet hole 111. The working process is as follows:

[0040] Under normal circumstances, the hammer 5 of the air intake system is located at the lower end. The operator turns on the air intake switch 2 by pressing the handle 22. Then, after the high-pressure gas is input from the handle 1, it will enter the lower chamber 106 through the air intake chamber 103, the air intake hole 104, and the cylinder airway 105 in sequence. At this time, the upper chamber 107, the air outlet blind hole 108, the air outlet hole 109, the air outlet chamber 110 and the exhaust hole 111 are connected, so the hammer 5 can move upward quickly under the push of the high-pressure gas.

[0041] Then, the upward movement of the hammer body 5 will drive the air outlet hole 109 to enter the cylinder body 5 and be closed, that is, the upper chamber 107 and the air outlet blind hole 108 can no longer communicate with the air outlet chamber 110 and the exhaust hole 111 through the air outlet hole 109. However, at this time, the high-pressure gas continues to enter the lower chamber 106. Therefore, vacuum compression will be generated in the upper chamber 107 and the air outlet blind hole 108 as the hammer body 5 moves upward, and high-pressure expansion gas will be formed.

[0042] Then the hammer body 5 continues to move upward, and drives the air outlet 109 to connect with the lower chamber 106. At this time, the lower chamber 106, the air outlet 109, the air outlet blind hole 108 and the upper chamber 107 will be instantly connected, and the continuously input high-pressure gas will instantly enter the upper chamber 107 and the air outlet blind hole 108, and make the high-pressure expansion gas instantly intervene in the external high-pressure gas, thereby forming a high-pressure gas explosion in the upper chamber 107, generating impact energy several times higher than that directly driven by compressed gas to push the hammer body 5, and the pushed hammer body 5 can quickly move downward to hit the shovel head 9, and the shovel head is pointed to the workpiece, thereby completing a round of air intake work of the air intake system.

[0043] Therefore, the continuously entering high-pressure gas repeats the intake route of the above-mentioned intake system again, which can drive the hammer body 5 to move axially back and forth and continuously hit the shovel head 9 to work. The hammer body 5 not only plays the role of an impact hammer, but also is equivalent to the gas distribution valve in the traditional air shovel structure.

[0044] The air shovel adopting the above-mentioned air intake system utilizes the pressurization method to drive the hammer to work, which reduces the gas consumption, avoids the waste of high-pressure gas, and also increases the impact energy.

[0045] Moreover, since there is always an air cushion in the upper cavity 107, the axial upward movement of the hammer body 5 will not hit the air inlet seat 4, thereby preventing the hammer body 5 from damaging parts, reducing the recoil vibration force when the air shovel is used, and improving the stability and comfort of the operating performance.

[0046] In addition, the air shovel with the above-mentioned air intake system can also effectively avoid the phenomenon of the hammer body 5 hitting empty. When the shovel head is forgotten to be installed or the shovel head is stuck in the workpiece during operation, the operator wants to pull the air shovel out to pull out the shovel head 9, while turning on the air intake switch 2 and hitting the air shovel in the air; at this time, if the hammer body 5 continues to impact and work, it will hit the inner step of the front body 7, thereby damaging the two main components of the air shovel, and seriously causing the air shovel to be scrapped. In order to prevent this situation from damaging the air shovel, as long as the front end of the hammer body 5 does not touch the shovel head 9, once it continues to move forward to the lowest point, the lower chamber 106 and the air intake channel 101 will be isolated, while the upper chamber 107 is connected to the air intake channel 101, and the compressed gas is discharged from the upper chamber 107 through the air outlet blind hole 108 and the air outlet hole 109 of the hammer body 5 directly to the air outlet chamber 110, and then discharged from the exhaust hole 111, and the hammer body 5 will stop moving, thereby technically solving the problem of damage due to empty hitting.

[0047] The overall material of the utility model is mainly made of light aluminum alloy and engineering plastics, so that the whole machine is light in weight, neat in appearance and good in operating feel.

[0048] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included in the protection scope of the present invention.

Claims

1. A straight-handled valveless booster air shovel, comprising a connecting pipe (3), a handle (1) mounted on the upper part of the connecting pipe, a cylinder (6) mounted on the lower part of the connecting pipe, and a front body (7) mounted on the lower part of the cylinder; a hammer (5) is arranged in the cylinder (6) and the front body (7), the upper end of the hammer is axially reciprocatingly sealed and inserted in the cylinder (6), and the lower part of the front body (7) is provided with a shovel head (9) axially movable and inserted, characterized in that The handle (1) is composed of a switch sleeve (11) mounted on the upper part of the connecting tube (3) and a handle body (12) mounted on the upper part of the switch sleeve. The handle body (12), the switch sleeve (11), the connecting tube (3), the cylinder body (6) and the front body (7) are all located on the same axis, and the handle (1) forms a straight handle. A connecting cavity (102) is provided in the switch sleeve (11), an air intake joint (101) is provided on the top of the handle body (12), an air intake switch (2) is provided in the handle body (12), and the air intake switch (2) controls the opening and closing of the connection between the air intake joint (101) and the connecting cavity (102).

2. A straight-handled valveless booster air shovel according to claim 1, characterized in that The handle body (12) is provided with a transverse hole (15), an oblique hole (13) arranged above the transverse hole, and a vertical hole (14) respectively connected to the transverse hole (15) and the connecting cavity (102); the air inlet joint (101) is sealed and inserted in the oblique hole (13) and is directly connected to the transverse hole (15).

3. A straight-handled valveless booster air shovel according to claim 2, characterized in that The air inlet switch (2) comprises a push rod (21) movably sealed and arranged in the transverse hole (15), the outer end of the push rod is elastically pushed outwards and extends out of the transverse hole (15) to contact the pressing handle (22), and the inner end of the push rod (21) is provided with a valve pad (211), and the pressing handle (22) presses the push rod (21) to move inwards and drives the valve pad (211) to open the transverse hole (15), or the push rod (21) is elastically pushed outwards to reset and drives the valve pad (211) to close the transverse hole (15).

4. A straight-handled valveless booster air shovel according to claim 3, characterized in that An inner shoulder (153) is provided in the middle of the transverse hole (15), and the inner shoulder divides the transverse hole (15) into a left hole (151) and a right hole (152). The push rod (21) is movably sealed and arranged in the left hole (151). The inner end of the push rod (21) extends into the right hole (152) and is provided with a valve pad (211). The right hole (152) is provided with a valve spring (23) for elastically pushing the push rod (21) outward. The push rod (21) moves axially inward and outward, and drives the valve pad (211) to separate from the inner shoulder (153) to open the transverse hole (15) or to contact the inner shoulder (153) to close the transverse hole (15).

5. A straight-handled valveless booster air shovel according to claim 1, characterized in that The cylinder body (6) is provided with a sealed air intake seat (4) at the upper part thereof; an upper chamber (107) is formed in the cylinder body (6) between the air intake seat and the upper end of the hammer body (5); a lower chamber (106) is formed between the outer wall of the hammer body (5) and the inner wall of the cylinder body (6); and an air outlet chamber (110) is formed between the hammer body (5) and the front body (7); a cylinder air passage (105) communicating with the lower chamber (106) is provided in the cylinder body (6); and air intake seats (4) are provided with air intake chambers (107) in the connecting pipes. 03) and an air inlet (104) of the cylinder air passage (105); a blind air outlet hole (108) communicating with the upper chamber (107) is provided in the hammer body (5); an air outlet hole (109) communicating with the blind air outlet hole (108) is provided on one side of the hammer body (5); the air outlet hole is connected to the air outlet chamber (110) or the lower chamber (106) by the axial reciprocating movement of the hammer body (5); and an exhaust hole (111) communicating with the air outlet chamber (110) and the outside atmosphere is provided on one side of the front body (7).

6. A straight-handled valveless booster air shovel according to claim 1, characterized in that A connecting sleeve (31) is provided between the connecting pipe (3) and the cylinder body (6), and the upper end of the front body (7) is threadedly connected to the lower end of the cylinder body (6).

7. A straight-handled valveless booster air shovel according to claim 1, characterized in that The front body (7) is provided with an axially penetrating mounting hole (71), and a side hole (72) communicating with the mounting hole is provided on one side of the front body, and a ball roller (73) is provided in the side hole; the lower part of the front body (7) is provided with an end sleeve (8) that is movably mounted, and the inner wall of the end sleeve is provided with a convex portion (81) and a concave portion (82); the end sleeve (8) moves upward to drive the concave portion (82) to face the ball roller (73), and the ball roller retracts into the side hole (72), and the upper end of the shovel head (9) is inserted into the mounting hole (71) or detached from the mounting hole (71); the end sleeve (8) moves downward to drive the convex portion (81) to push the ball roller (73), and the ball roller extends out of the side hole (72) to lock the upper end of the shovel head (9).

8. A straight-handled valveless booster air shovel according to claim 7, characterized in that A plurality of grooves (91) evenly distributed around the circumference are provided on the outer circumferential surface of the upper end of the shovel head (9), and the ball head roller (73) extends out of the side hole (72) and is fitted in the groove (91) to lock the upper end of the shovel head (9).

9. A straight-handled valveless booster air shovel according to claim 8, characterized in that The groove (91) is a waist-shaped groove extending in the axial direction. The length of the groove (91) must be greater than the diameter of the side hole (72) and allow the ball roller (73) to have a travel distance for axial up and down reciprocating movement in the groove (91).

10. A straight-handled valveless booster air shovel according to claim 9, characterized in that The lower part of the front body (7) is provided with a sleeve-mounted end sleeve compression spring (74), which elastically pushes the end sleeve (8) downward, thereby driving the convex part (81) to push the ball head roller (73); the front body (7) is provided with a shaft retaining ring (10) for fixing the lower end position of the end sleeve (8).

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