Impact device

Abstract

The invention discloses an impact device, belongs to the technical field of engineering machinery, and aims to solve the problem that downward impact force and impact speed of an external impact component of the engineering machinery do not have explosive force. Comprising a cylinder body and a piston rod, a positive integer of cavities are formed in the cylinder body, a positive integer of piston blades are arranged on the piston rod, the peripheries of the positive integer of piston blades are in one-to-one corresponding sliding sealing fit with the inner circumferential walls of the positive integer of cavities, and the end walls of the two ends of each cavity are in sliding sealing fit with the piston rod. The piston blades divide the corresponding cavities into closed upper gas cavities and lower gas cavities, gas media are arranged in the upper gas cavities and the lower gas cavities, the upper ends of the piston rods extend out of the cylinder body and are connected with the lifting mechanism, the lifting mechanism circularly lifts and separates the piston rods, and the lower ends of the piston rods extend out of the cylinder body. When the piston rod is lifted by the lifting mechanism, the gas medium in the upper gas cavity is compressed, and energy is accumulated, so that the explosion effect of downward impact can be obtained when the piston rod is separated from the lifting mechanism.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to an impact device. BACKGROUND

[0002] A rammer is a compaction machine for compacting backfill soil in layers by impact and impact vibration, and a breaker is a device for breaking hard soil and stone. The rammer and the breaker and other engineering machinery have a function of driving an impact shaft member to reciprocate and slide so as to realize external impact. The main performance thereof depends on the impact capacity of the downward movement of the impact shaft member.

[0003] The existing rammer or breaker drives the impact shaft member to reciprocate and lift by a mechanical mechanism or a hydraulic system. The lifting and downward impact speed of the impact shaft member are similar. The downward impact force and the impact speed are limited by the power provided by the driving device, and the impact device does not have explosive power. SUMMARY

[0004] The present application aims to provide an impact device to solve the problem that the downward impact force and the impact speed of the impact shaft member of the engineering machinery are limited by the power provided by the driving device, and the impact device does not have explosive power. The technical solution adopted by the present application is as follows.

[0005] An impact device comprises a cylinder and a piston rod. The cylinder is provided with a positive integer number of chambers. The piston rod is provided with a positive integer number of piston blades. The outer periphery of the positive integer number of piston blades is in one-to-one correspondence with the inner periphery of the positive integer number of chambers and is in sliding sealing cooperation. The two end walls of each chamber are in sliding sealing cooperation with the piston rod. The piston blades divide the corresponding chambers into closed upper gas chambers and lower gas chambers. The upper gas chambers and the lower gas chambers are provided with gas media. The upper end of the piston rod extends out of the cylinder and is connected with a lifting mechanism. The lifting mechanism cyclically lifts the piston rod and separates it. The lower end of the piston rod extends out of the cylinder.

[0006] Further, the outer periphery of the piston blade is sleeved with a plurality of first sealing rings. The piston blade is in sliding sealing cooperation with the inner periphery of the corresponding chamber through the plurality of first sealing rings.

[0007] Further, the end wall is provided with an inner hole through which the piston rod passes. The inner hole is provided with a plurality of second sealing rings. The end wall is in sliding sealing cooperation with the piston rod through the plurality of second sealing rings.

[0008] Further, the upper gas chamber is connected with a first gas charging hole. The first gas charging hole is provided with a gas charging one-way valve. The gas medium in the upper gas chamber is compressed gas.

[0009] Further, the lower gas chamber is connected with a second gas charging hole. The second gas charging hole is provided with a gas charging one-way valve. The gas medium in the lower gas chamber is compressed gas.

[0010] Further, the number of the chambers is multiple, the upper gas chambers of the multiple chambers are respectively communicated with first gas collecting boxes, the first gas charging holes are arranged on the first gas collecting boxes, the lower gas chambers of the multiple chambers are respectively communicated with second gas collecting boxes, and the second gas charging holes are arranged on the second gas collecting boxes.

[0011] Further, the multiple chambers are arranged from top to bottom, and any two adjacent chambers are separated by a shared end wall.

[0012] Further, the lifting mechanism comprises a support arranged on the cylinder body, two cams are synchronously arranged on the support, the cam is coaxially connected with the driven gear, the top end of the piston rod is provided with a horizontal shaft, both ends of the horizontal shaft are respectively sleeved with shaft sleeves, the outer periphery of the two cams is in rolling fit with the outer periphery of the two shaft sleeves on the lower side one by one, the outer periphery of the cam is provided with a large-diameter end and a small-diameter end, the large-diameter end and the small-diameter end are located on the same side of the cam shaft, the small-diameter end and the large-diameter end form a radial difference, the small-diameter end is connected with the large-diameter end through the outer peripheral curved surface with gradually increasing diameter, the piston rod is provided with a first vertical sliding groove, a first sliding rod is connected with the cylinder body, and the first sliding rod is in sliding fit with the first sliding groove.

[0013] When the cam rotates from the small-diameter end abutting against the corresponding shaft sleeve to the large-diameter end abutting against the corresponding shaft sleeve, the piston rod is gradually lifted to the high position, the piston blade slides to the top of the corresponding chamber, the gas medium in the upper gas chamber is compressed, and the gas medium in the lower gas chamber is expanded; when the cam continues to rotate, the shaft sleeve is separated from the corresponding cam, the gas medium in the upper gas chamber pushes the corresponding piston blade to slide downward, the piston rod impacts downward, the medium in the lower gas chamber is compressed, and the medium in the upper gas chamber is expanded; when the piston blade slides to the bottom of the corresponding chamber, the medium in the lower gas chamber forms a damping gas layer, the piston rod stops impacting downward, and the shaft sleeve falls to re-coordinate with the small-diameter end of the corresponding cam.

[0014] Further, the outer peripheral curved surface is an involute curved surface.

[0015] Further, the lifting mechanism comprises a support and a lifting cylinder, the support is arranged on the cylinder body, the outer periphery of the support is provided with a bearing groove, the inner periphery of the lifting cylinder is provided with a circular ring structure, the circular ring structure and the bearing groove are in rotating fit through three-row roller combined rotary disc bearings, the outer periphery of the lifting cylinder is provided with a gear structure, the upper end surface of the lifting cylinder is a double helical surface, the rotation direction, pitch and height of the two helical surfaces are the same, the top end of the piston rod is provided with a horizontal shaft, both ends of the horizontal shaft are respectively sleeved with shaft sleeves, the two shaft sleeves are arranged on the two helical surfaces in turn, the piston rod is provided with a second vertical sliding groove, a second sliding rod is connected with the cylinder body, and the second sliding rod is in sliding fit with the second sliding groove.

[0016] When the helical surface is rotated from the bottom end abutting the corresponding shaft sleeve to the top end abutting the corresponding shaft sleeve, the piston rod is gradually lifted to the high position, the piston blade slides to the top of the corresponding chamber, the gas medium in the upper gas chamber is compressed, and the gas medium in the lower gas chamber is expanded; when the lifting cylinder continues to rotate, the shaft sleeve is separated from the lifting cylinder, the gas medium in the upper gas chamber pushes the corresponding piston blade to slide downward, the piston rod impacts downward, and the medium in the lower gas chamber is compressed, and the medium in the upper gas chamber is expanded; when the piston blade slides to the bottom of the corresponding chamber, the medium in the lower gas chamber forms a damping gas layer, the piston rod stops impacting downward, and the shaft sleeve falls and cooperates with the bottom end of another helical surface.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The cylinder is provided with one or more chambers, and the piston rod is provided with piston blades corresponding to the number of chambers, the piston blades separate the corresponding chambers into upper gas chambers and lower gas chambers, when the lifting mechanism lifts the piston rod, the gas medium in the upper gas chamber is compressed to form high-pressure medium, and the energy output by the lifting mechanism is accumulated in the high-pressure medium, when the output end of the lifting mechanism is separated from the piston rod, the piston rod is no longer subjected to upward lifting force, in addition to gravity, the gas medium in the upper gas chamber also exerts downward pressure on the corresponding piston blade, so that the piston rod obtains instantaneous downward impact force, the compressed high-pressure medium in the upper gas chamber enables the piston rod to have explosive impact, and when the present application is installed on engineering machinery such as a breaking hammer or a rammer, the piston rod is connected with an external impact component such as a breaking hammer rod or a rammer of a rammer, so that the impact effect is much higher than that of the existing breaking hammer or rammer.

[0019] 2. The lower gas chamber is provided with gas medium, when the piston rod impacts downward, the gas medium in the lower gas chamber is gradually compressed, so that a damping gas layer is formed when the piston rod completes the downward impact, thereby playing a buffering and damping role. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an axonometric view of the first embodiment of the present application;

[0021] Figure 2 is a structural schematic view of the first embodiment of the present application with half of the cylinder removed;

[0022] Figure 3 is a sectional view of the first embodiment of the present application;

[0023] Figure 4 is a structural schematic view of the lifting mechanism of the first embodiment of the present application;

[0024] Figure 5 is a structural schematic view of the cam of the first embodiment of the present application;

[0025] Figure 6 is an axonometric view of the second embodiment of the application;

[0026] Figure 7 is a cross-sectional view of the second embodiment of the application;

[0027] Figure 8 is a schematic view of the lifting mechanism structure of the second embodiment of the application.

[0028] In the figure, 1. cylinder, 2. second air inlet hole, 3. first sliding rod, 4. support, 5. shaft sleeve, 6. piston rod, 7. cam, 8. driven gear, 9. horizontal shaft, 10. first sliding groove, 11. end wall, 12. second sealing ring, 13. first sealing ring, 14. piston blade, 15. upper air cavity, 16. lower air cavity, 17. first air inlet hole, 18. lifting cylinder, 19. second sliding rod, 20. helical surface, 21. gear structure, 22. second sliding groove, 23. three-row roller combination turntable bearing, 24. support cylinder, 25. large-diameter end, 26. small-diameter end. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer and more comprehensible, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0030] The connection mentioned in the present application is divided into fixed connection and detachable connection. The fixed connection, i.e. non-detachable connection, includes but is not limited to conventional fixed connection modes such as flange connection, rivet connection, adhesive connection and welding connection. The detachable connection includes but is not limited to conventional detachable modes such as bolt connection, buckle connection, pin connection and hinge connection. When the specific connection mode is not explicitly limited, at least one connection mode can be found in the existing connection mode to achieve the function, and the person skilled in the art can select it according to the needs. For example, the fixed connection selects welding connection, and the detachable connection selects bolt connection.

[0031] The present application will be further described in detail below with reference to the drawings. The following examples are an explanation of the present application, and the present application is not limited to the following examples.

[0032] Example 1: as Figures 1-5As shown, an impact device comprises a cylinder 1 and a piston rod 6, the cylinder 1 is provided with a positive integer number of chambers, the piston rod 6 is provided with a positive integer number of piston blades 14, the outer periphery of the positive integer number of piston blades 14 is respectively in one-to-one correspondence with the inner peripheral wall of the positive integer number of chambers for sliding sealing cooperation, the two end walls 11 of each chamber are in sliding sealing cooperation with the piston rod 6, the piston blades 14 divide the corresponding chambers into closed upper gas chambers 15 and lower gas chambers 16, the upper gas chambers 15 and the lower gas chambers 16 are both provided with gas medium, the upper end of the piston rod 6 extends out of the cylinder 1 and is connected with a lifting mechanism, the lifting mechanism cyclically lifts and separates the piston rod 6, the lower end of the piston rod 6 extends out of the cylinder 1 and is connected with an external impact member.

[0033] The outer periphery of the piston blade 14 is sleeved with a plurality of first sealing rings 13, and the piston blade 14 is in sliding sealing cooperation with the inner peripheral wall of the corresponding chamber through the plurality of first sealing rings 13.

[0034] The end wall 11 is provided with an inner hole through which the piston rod 6 passes, and a plurality of second sealing rings 12 are arranged in the inner hole, and the end wall 11 is in sliding sealing cooperation with the piston rod 6 through the plurality of second sealing rings 12.

[0035] The upper gas chamber 15 is connected with a first gas filling hole 17, and a gas filling one-way valve is arranged in the first gas filling hole 17, and the gas medium in the upper gas chamber 15 is compressed gas.

[0036] The lower gas chamber 16 is connected with a second gas filling hole 2, and a gas filling one-way valve is arranged in the second gas filling hole 2, and the gas medium in the lower gas chamber 16 is compressed gas.

[0037] The number of the chambers is multiple, the upper gas chambers 15 of the multiple chambers are respectively communicated with first gas collecting boxes, the first gas filling holes 17 are arranged on the first gas collecting boxes, the lower gas chambers 16 of the multiple chambers are respectively communicated with second gas collecting boxes, and the second gas filling holes 2 are arranged on the second gas collecting boxes.

[0038] The multiple chambers are arranged from top to bottom, and any two adjacent chambers are separated by a shared end wall 11.

[0039] The lifting mechanism comprises a bracket 4 arranged on the cylinder body 1, two camshafts 7 arranged on the bracket 4 and rotating synchronously, the camshafts 7 being coaxially connected with a driven gear 8, the top end of the piston rod 6 being provided with a horizontal shaft 9, both ends of the horizontal shaft 9 being respectively sleeved with shaft sleeves 5, the outer periphery of the two camshafts 7 being in rolling fit with the lower side of the outer periphery of the two shaft sleeves 5 one by one, the outer periphery of the camshafts 7 being provided with a large-diameter end 25 and a small-diameter end 26, the large-diameter end 25 and the small-diameter end 26 being located on the same side of the axis of the camshafts 7, the small-diameter end 26 being radially offset from the large-diameter end 25, the small-diameter end 26 being connected with the large-diameter end 25 through an outer periphery curved surface gradually increasing in diameter, the piston rod 6 being provided with a first vertical sliding groove 10, a first sliding rod 3 being connected with the cylinder body 1 and being in sliding fit with the first sliding groove 10.

[0040] When the camshafts 7 rotate from the small-diameter end 26 abutting against the corresponding shaft sleeve 5 to the large-diameter end 25 abutting against the corresponding shaft sleeve 5, the piston rod 6 is gradually lifted to a high position, the piston blade 14 slides to the top of the corresponding chamber, the gas medium in the upper gas chamber 15 is compressed, and the gas medium in the lower gas chamber 16 is expanded; when the camshafts 7 continue to rotate, the shaft sleeve 5 is separated from the corresponding camshaft 7, the gas medium in the upper gas chamber 15 pushes the corresponding piston blade 14 to slide downward, the piston rod 6 impacts downward, the medium in the lower gas chamber 16 is compressed, and the medium in the upper gas chamber 15 is expanded; when the piston blade 14 slides to the bottom of the corresponding chamber, the medium in the lower gas chamber 16 forms a damping gas layer, the piston rod 6 stops impacting downward, and the shaft sleeve 5 falls to be in fit with the small-diameter end 26 of the corresponding camshaft 7 again.

[0041] The outer periphery curved surface is a involute curved surface.

[0042] The cylinder body 1 is provided with one or more chambers, the piston rod 6 is provided with the same number of piston blades 14 as the number of the chambers, the piston blade separates the corresponding chamber into the upper gas chamber 15 and the lower gas chamber 16, when the lifting mechanism lifts the piston rod 6, the gas medium in the upper gas chamber 15 is compressed to form high-pressure medium, the energy output by the lifting mechanism is accumulated in the high-pressure medium, when the output end of the lifting mechanism is separated from the piston rod 6, the piston rod 6 no longer receives upward lifting force, in addition to gravity, the gas medium in the upper gas chamber 15 also exerts downward pressure on the corresponding piston blade 14, so that the piston rod 6 obtains instantaneous downward impact force, the compressed high-pressure medium in the upper gas chamber 15 makes the piston rod 6 have explosive impact, the present application is installed on a breaking hammer or a rammer, etc., the piston rod 6 is connected with an external impact component such as a drill rod of the breaking hammer or a rammer of the rammer, so that the impact effect is much higher than that of the existing breaking hammer or rammer.

[0043] The lower gas chamber 16 is provided with gas medium, when the piston rod 6 impacts downward, the gas medium in the lower gas chamber 16 is gradually compressed, so that a damping gas layer is formed when the piston rod 6 completes downward impact, thereby playing a role in buffering and shock absorption.

[0044] The number of chambers can be one or more. The gas medium in the upper air chamber 15 and the lower air chamber 16 can be ordinary air or compressed air, depending on the impact effect.

[0045] This embodiment provides one implementation of the lifting mechanism. Two driving gears mesh one-to-one with two driven gears 8. The driving motor drives both driving gears simultaneously through the transmission mechanism, so that the two cams 7 can rotate synchronously. The advantage of this arrangement is that the two cams 7 are arranged on both sides of the piston rod 6, so that the lifting force on the piston rod 6 is more uniform. The piston rod 6 is lifted by the cam 7 with the involute outer peripheral curved surface. When the piston rod 6 disengages from the large diameter end 25 of the cam, it disengages from the cam 7. After the piston rod 6 completes the downward impact, the bushing 5 on the horizontal shaft 9 re-engages with the small diameter end 26 of the cam 7. One rotation of the cam 7 realizes one downward impact of the piston rod 6.

[0046] Example 2: Figures 6-8 As shown, an impact device includes a cylinder body 1 and a piston rod 6. The cylinder body 1 has a positive integer number of chambers, and the piston rod 6 has a positive integer number of piston blades 14. The outer periphery of the positive integer number of piston blades 14 is respectively slidably sealed to the inner peripheral wall of the positive integer number of chambers. The two end walls 11 of each chamber are slidably sealed to the piston rod 6. The piston blades 14 divide the corresponding chambers into a sealed upper air chamber 15 and a lower air chamber 16. Both the upper air chamber 15 and the lower air chamber 16 contain a gas medium. The upper end of the piston rod 6 extends out of the cylinder body 1 and is connected to a lifting mechanism. The lifting mechanism cyclically lifts and disengages the piston rod 6. The lower end of the piston rod 6 extends out of the cylinder body 1 and is connected to an external impact component.

[0047] The piston blade 14 is fitted with a plurality of first sealing rings 13 on its outer periphery, and the piston blade 14 slides and seals with the inner peripheral wall of the corresponding chamber through the plurality of first sealing rings 13.

[0048] The end wall 11 is provided with an inner hole through which the piston rod 6 can pass. A plurality of second sealing rings 12 are provided in the inner hole, and the end wall 11 is slidably sealed with the piston rod 6 through the plurality of second sealing rings 12.

[0049] The upper air chamber 15 is connected to the first air inlet 17, and the first air inlet 17 is equipped with an air inlet one-way valve. The gas medium in the upper air chamber 15 is compressed gas.

[0050] The lower air chamber 16 is connected to the second air inlet 2, and the second air inlet 2 is equipped with an air inlet one-way valve. The gas medium in the lower air chamber 16 is compressed gas.

[0051] The number of the chambers is multiple, the upper gas chambers 15 of the multiple chambers are respectively communicated with first gas collecting boxes, the first gas filling holes 17 are arranged on the first gas collecting boxes, the lower gas chambers 16 of the multiple chambers are respectively communicated with second gas collecting boxes, and the second gas filling holes 2 are arranged on the second gas collecting boxes.

[0052] The multiple chambers are arranged from top to bottom, and any two adjacent chambers are separated by a shared end wall 11.

[0053] The lifting mechanism comprises a supporting cylinder 24 and a lifting cylinder 18, the supporting cylinder 24 is arranged on the cylinder body 1, the outer periphery of the supporting cylinder 24 is provided with a bearing groove, the inner periphery of the lifting cylinder 18 is provided with a circular ring structure, the circular ring structure and the bearing groove are rotationally matched through a three-row roller combined turntable bearing 23, the outer periphery of the lifting cylinder 18 is provided with a gear structure 21, the upper end surface of the lifting cylinder 18 is a double helical surface 20, the rotation direction, pitch and height of the two helical surfaces 20 are the same, the top end of the piston rod 6 is provided with a horizontal shaft 9, both ends of the horizontal shaft 9 are respectively sleeved with shaft sleeves 5, the two shaft sleeves 5 are alternately and rollingly arranged on the two helical surfaces 20, the piston rod 6 is provided with a second sliding groove 22 arranged in a vertical direction, a second sliding rod 19 is connected with the cylinder body 1, and the second sliding rod 19 is slidably matched with the second sliding groove 22.

[0054] When the helical surface 20 is rotated from the bottom end to the top end and abuts against the corresponding shaft sleeve 5, the piston rod 6 is gradually lifted to the high position, the piston blade 14 slides to the top of the corresponding chamber, the gas medium in the upper gas chamber 15 is compressed, and the gas medium in the lower gas chamber 16 is expanded; when the lifting cylinder 18 continues to rotate, the shaft sleeve 5 is separated from the lifting cylinder 18, the gas medium in the upper gas chamber 15 pushes the corresponding piston blade 14 to slide downward, the piston rod 6 impacts downward, the medium in the lower gas chamber 16 is compressed, and the medium in the upper gas chamber 15 is expanded; when the piston blade 14 slides to the bottom of the corresponding chamber, the medium in the lower gas chamber 16 forms a damping gas layer, the piston rod 6 stops impacting downward, and the shaft sleeve 5 falls and is matched with the bottom end of the other helical surface 20.

[0055] The principle and effect of the external impact of the embodiment are the same as those of the first embodiment, and will not be described again. The embodiment gives another implementation of the lifting mechanism. The driving gear is arranged on the output shaft of the motor, and the driving gear is engaged with the gear structure 21, so that the lifting cylinder 18 can be driven to rotate. The helical surface 20 at the top end of the lifting cylinder 18 is a semicircular helical surface. The piston rod 6 passes through the axis of the lifting cylinder 18, so that the two helical surfaces 20 are circumferentially arranged on the outer periphery of the piston rod 6. The advantage of such an arrangement is that the lifting force received by the piston rod 6 is more uniform. The piston rod 6 is lifted by the helical surface 20 at the top end of the lifting cylinder 18. When the piston rod 6 is separated from the top end of the helical surface, it is separated from the lifting cylinder 18. After the piston rod 6 completes the downward impact, the shaft sleeve 5 on the horizontal shaft 9 cooperates with the lower end of the other helical surface 20. The lifting cylinder 18 rotates one revolution to realize the downward impact of the piston rod 6 twice.

[0056] The above embodiments are only exemplary descriptions of the present application and do not limit the protection scope thereof. Those skilled in the art can also make changes to parts thereof, as long as the changes do not exceed the spirit and essence of the present application, and are within the protection scope of the present application.

Claims

1. An impact device, characterized in that: The cylinder (1) includes a cylinder body (1) and a piston rod (6). The cylinder body (1) has a positive integer number of chambers. The piston rod (6) has a positive integer number of piston blades (14). The outer periphery of the positive integer number of piston blades (14) is respectively slidably sealed to the inner periphery of the positive integer number of chambers. The end walls (11) of each chamber are slidably sealed to the piston rod (6). The piston blades (14) divide the corresponding chambers into a sealed upper air chamber (15) and a lower air chamber (16). Both the upper air chamber (15) and the lower air chamber (16) contain a gas medium. The upper end of the piston rod (6) extends out of the cylinder body (1) and is connected to a lifting mechanism. The lifting mechanism cyclically lifts and disengages the piston rod (6). The lower end of the piston rod (6) extends out of the cylinder body (1).

2. The impact device according to claim 1, characterized in that: The piston blade (14) is fitted with a number of first sealing rings (13) on its outer periphery, and the piston blade (14) slides and seals with the inner peripheral wall of the corresponding chamber through the number of first sealing rings (13).

3. The impact device according to claim 1, characterized in that: The end wall (11) is provided with an inner hole through which the piston rod (6) can pass. Several second sealing rings (12) are provided in the inner hole. The end wall (11) is slidably sealed with the piston rod (6) through several second sealing rings (12).

4. The impact device according to claim 1, characterized in that: The upper air chamber (15) is connected to the first air inlet (17), and the first air inlet (17) is equipped with an air inlet one-way valve. The gas medium in the upper air chamber (15) is compressed gas.

5. The impact device according to claim 4, characterized in that: The lower air chamber (16) is connected to the second air inlet (2), and the second air inlet (2) is equipped with an air inlet one-way valve. The gas medium in the lower air chamber (16) is compressed gas.

6. The impact device according to claim 5, characterized in that: The number of chambers is multiple, the upper air chambers (15) of the multiple chambers are respectively connected to the first air collection box, the first air inlet (17) is provided on the first air collection box, the lower air chambers (16) of the multiple chambers are respectively connected to the second air collection box, and the second air inlet (2) is provided on the second air collection box.

7. An impact device according to claim 6, characterized in that: The multiple chambers are arranged from top to bottom, and any two adjacent chambers are separated by a common end wall (11).

8. An impact device according to any one of claims 1-7, characterized in that: The lifting mechanism includes a bracket (4), which is mounted on the cylinder (1). Two cams (7) are synchronously rotated and mounted on the bracket (4). The cams (7) are coaxially connected to the driven gear (8). The top of the piston rod (6) is provided with a horizontal shaft (9). The two ends of the horizontal shaft (9) are respectively fitted with bushings (5). The outer periphery of the two cams (7) and the lower outer periphery of the two bushings (5) are in rolling engagement. The outer periphery of the cams (7) is provided with a large-diameter end (2). 5) and small diameter end (26), the large diameter end (25) and small diameter end (26) are located on the same side of the axis of cam (7), the small diameter end (26) and the large diameter end (25) form a radial drop, the small diameter end (26) is connected to the large diameter end (25) through an outer peripheral curved surface with a gradually increasing diameter, the piston rod (6) is provided with a vertically arranged first sliding groove (10), the first sliding rod (3) is connected to the cylinder (1), and the first sliding rod (3) and the first sliding groove (10) are in sliding fit; As the cam (7) rotates from its small diameter end (26) abutting against the corresponding bushing (5) to its large diameter end (25) abutting against the corresponding bushing (5), the piston rod (6) is gradually lifted to a high position, the piston blade (14) slides up to the top of the corresponding chamber, the gas medium in the upper air chamber (15) is compressed, and the gas medium in the lower air chamber (16) is expanded; when the cam (7) continues to rotate, the bushing (5) disengages from the corresponding cam (7), the gas medium in the upper air chamber (15) pushes the corresponding piston blade (14) down, the piston rod (6) impacts downward, the medium in the lower air chamber (16) is compressed, and the medium in the upper air chamber (15) is expanded; when the piston blade (14) slides down to the bottom of the corresponding chamber, the medium in the lower air chamber (16) forms a damping gas layer, the piston rod (6) stops impacting downward, and the bushing (5) falls down and re-engages with the small diameter end (26) of the corresponding cam (7).

9. An impact device according to claim 8, characterized in that: The outer peripheral surface is an involute surface.

10. An impact device according to any one of claims 1-7, characterized in that: The lifting mechanism includes a support cylinder (24) and a lifting cylinder (18). The support cylinder (24) is set on the cylinder body (1). The outer circumference of the support cylinder (24) is provided with a bearing groove. The inner circumference of the lifting cylinder (18) is provided with a ring structure. The ring structure and the bearing groove are rotated and engaged by a three-row roller combination turntable bearing (23). The outer circumference of the lifting cylinder (18) is provided with a gear tooth structure (21). The upper end face of the lifting cylinder (18) is a double helical surface (20). The helical direction, pitch and height of the two helical surfaces (20) are the same. The top end of the piston rod (6) is provided with a horizontal shaft (9). The two ends of the horizontal shaft (9) are respectively sleeved with bushings (5). The two bushings (5) are alternately rolled on the two helical surfaces (20). The piston rod (6) is provided with a vertically arranged second sliding groove (22). The second sliding rod (19) is connected to the cylinder body (1). The second sliding rod (19) and the second sliding groove (22) are slidably engaged. As the spiral surface (20) rotates from its bottom end against the corresponding bushing (5) to its top end against the corresponding bushing (5), the piston rod (6) is gradually lifted to a high position, the piston blade (14) slides up to the top of the corresponding chamber, the gas medium in the upper air chamber (15) is compressed, and the gas medium in the lower air chamber (16) is expanded; when the lifting cylinder (18) continues to rotate, the bushing (5) disengages from the lifting cylinder (18), the gas medium in the upper air chamber (15) pushes the corresponding piston blade (14) down, the piston rod (6) impacts downward, the medium in the lower air chamber (16) is compressed, and the medium in the upper air chamber (15) is expanded; when the piston blade (14) slides down to the bottom of the corresponding chamber, the medium in the lower air chamber (16) forms a damping gas layer, the piston rod (6) stops impacting downward, and the bushing (5) falls down to engage with the bottom end of another spiral surface (20).

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