Quartering hammer with high-sensitivity reversing valve

Abstract

The utility model provides a breaking hammer with a high-sensitivity reversing valve, which comprises a drill rod and an impact main body, and a movable cavity is divided into a first movable cavity, a second movable cavity and a third movable cavity by an impact rod; the reversing valve is installed in the reversing valve cavity and provided with a sealing gasket, and when the reversing valve moves, the communicating part of the second reversing valve cavity and the third reversing valve cavity can be opened or closed; the first oil way communicates with the first movable cavity and the oil inlet way, the second oil way communicates with the second reversing valve cavity and the oil inlet way, one end of the third oil way communicates with the first reversing valve cavity, and the other end of the third oil way moves along with the impact rod to communicate with the first movable cavity or the second movable cavity. The fourth oil way is communicated with the third reversing valve cavity and the third movable cavity; the oil return path is communicated with the second movable cavity and the third movable cavity; the stress area of the side, facing the third movable cavity, of the impact rod is larger than that of the side, facing the first movable cavity, of the impact rod. According to the breaking hammer with the high-sensitivity reversing valve, an oil way can be opened and closed only through a short stroke, and the reversing response is fast.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a breaker hammer with a high-sensitivity reversing valve. Background Art

[0002] Hydraulic breakers are usually installed on excavators and use the hydraulic energy provided by the excavator to work. The working efficiency of the breaker depends on the kinetic energy and frequency of the drill rod hitting the object. The appropriate striking frequency and striking speed are crucial to ensure working efficiency. The reversing valve is an important core component of the breaker. Its main function is to change the flow direction of the hydraulic oil so that the impact rod can achieve up and down reciprocating motion, and then hit the drill rod to achieve the function of breaking.

[0003] The hydraulic breakers currently in common use have the following problems: the reversing valve core has a complex structure and a long stroke, and the reversing valve core must reach a corresponding stroke to achieve the conduction and closing of the oil circuit, resulting in a long reversing time, slow response of the impact rod, and affected striking frequency. Figure 3 and Figure 4 As shown, Figure 3 In the state, the oil inlet channel 05 squeezes the reversing valve core 01 from above, pushing the reversing valve core 01 to the bottom dead center. At this time, the upper channel 02 on the reversing valve core 01 connects the upper hydraulic oil chamber 03 with the oil return channel 04, and the oil in the oil inlet channel 05 also enters the lower hydraulic oil chamber 06, pushing the impact rod to move upward; Figure 4 When in the state, the oil in the oil inlet channel 05 continuously enters the lower hydraulic oil chamber 06, pushing the impact rod upward. After the oil circuit at the bottom of the reversing valve core 01 is connected with the lower hydraulic oil chamber 06, the reversing valve core 01 is pushed upward to the position shown in the figure. At this time, the lower channel 07 on the reversing valve core 01 connects the oil inlet channel 05 and the upper hydraulic oil chamber 03. At this time, the hydraulic oil enters the upper hydraulic oil chamber 03, driving the impact rod to descend, and the cycle repeats; since the stroke of the reversing valve core 01 is longer each time the direction is reversed, the reversing speed is slow, and the channel can only be smoothly connected after the reversing valve core 01 moves into place, which also reduces the reversing speed. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the technical defects that the reversing valve core structure of the breaker hammer in the prior art is complex, the reversing valve core has a long stroke due to structural limitations, and the reversing valve core must reach a corresponding stroke to achieve the conduction and closing of the oil circuit, resulting in slow response of the impact rod and affecting the striking frequency and striking speed, thereby providing a breaker hammer with a high-sensitivity reversing valve.

[0005] To this end, the utility model provides a breaker hammer with a high-sensitivity reversing valve, comprising a drill rod and a striking body, wherein the drill rod is movably mounted at the front end of the striking body, the rear end of the drill rod is opposite to the front end of the striking rod, and when the striking rod moves back and forth, it can continuously strike the drill rod; further, it also comprises:

[0006] An active cavity is arranged inside the impact body and is used to install an impact rod; when the impact rod is installed into the active cavity, the active cavity is divided into a first active cavity, a second active cavity and a third active cavity which are not connected to each other;

[0007] A reversing valve chamber, arranged inside the impact body, comprising a first reversing valve chamber, a second reversing valve chamber and a third reversing valve chamber which are connected in sequence;

[0008] a reversing valve installed inside the reversing valve cavity, having sealing gaskets respectively located inside the first reversing valve cavity, the second reversing valve cavity or the third reversing valve cavity, and when the reversing valve moves, it can open or close the connecting part connecting the second reversing valve cavity and the third reversing valve cavity;

[0009] An oil inlet circuit is arranged inside the impact body, one end of which is connected to an external oil circuit and is used to input hydraulic oil;

[0010] a first oil circuit, used for connecting the first movable chamber and the oil inlet circuit;

[0011] A second oil circuit, used for connecting the second reversing valve chamber and the oil inlet circuit;

[0012] a third oil circuit, one end of which is connected to the first reversing valve chamber and the other end of which is open on the inner wall of the active chamber; when the impact rod moves inside the active chamber, it switches between being connected to the first active chamber and being connected to the second active chamber;

[0013] a fourth oil circuit, used for connecting the third reversing valve chamber and the third active chamber;

[0014] an oil return path, communicating with the second active chamber and the third active chamber;

[0015] The force-bearing area of ​​the impact rod facing the third active cavity is larger than the force-bearing area of ​​the impact rod facing the first active cavity.

[0016] Furthermore, the impact rod includes a first section, a second section and a third section connected in sequence; a first seal is provided between the first section and the second section, and a second seal is provided between the second section and the third section; the outer diameter of the impact rod is smaller than the outer diameter of the active cavity to form a gap, and the active cavity is divided into the first active cavity, the second active cavity and the third active cavity by the first seal and the second seal.

[0017] Furthermore, the outer diameter of the third section is smaller than the outer diameter of the first section, so that the force-bearing area of ​​the impact rod facing the third active cavity is larger than the force-bearing area of ​​the impact rod facing the first active cavity.

[0018] Furthermore, a third seal is provided on the first section, and the first active cavity is formed between the first seal and the third seal.

[0019] Furthermore, an end cover is installed at the tail of the third active cavity, and the end cover has an end cover cavity. The inner diameter of the end cover cavity is consistent with the outer diameter of the third section and can be matched and plugged in. The oil return port is arranged on the end cover and is connected to the end cover cavity.

[0020] Furthermore, the reversing valve comprises:

[0021] Valve stem;

[0022] a first sealing gasket, fixedly sleeved on the valve stem and located inside the first reversing valve chamber, dividing the first reversing valve chamber into two parts, one part being communicated with the third oil circuit, and the other part being communicated with the second reversing valve chamber;

[0023] A second sealing gasket, fixedly sleeved on the valve stem; located inside the first reversing valve cavity or the second reversing valve, and used for sealing or opening a passage connecting the second reversing valve cavity and the third reversing valve cavity;

[0024] The limit block is fixedly sleeved on the valve stem and is located inside the third reversing valve cavity. A limit blocking portion opposite to the limit block is also provided inside the third reversing valve cavity.

[0025] Furthermore, the length of the connecting portion connecting the second reversing valve chamber and the third reversing valve chamber is 4 mm-8 mm.

[0026] Furthermore, it also includes an accumulator, which is connected to the oil inlet pipe.

[0027] As a preferred solution, the head end of the drill rod is a straight-line structure.

[0028] As a preferred solution, a cylindrical impact structure is provided at the tail end of the drill rod, and the impact structure provided at the head end of the impact rod is a trapezoidal cylinder, and the small end of the trapezoidal cylinder is arranged opposite to the cylindrical impact structure.

[0029] The technical solution provided by the utility model has the following advantages:

[0030] The utility model discloses a breaker hammer with a high-sensitivity reversing valve, comprising a drill rod and an impact body, the reversing valve used in the impact body has a simple structure and a short stroke of the reversing valve; compared with the prior art, the technical solution of the utility model changes the reversing mode of the reversing valve from a stroke type to a switch type, that is, the reversing valve does not need to be moved into position to smoothly connect the channel during reversing, but as long as the reversing valve is slightly moved, the channel between the second reversing valve chamber and the third reversing valve chamber is opened or closed, thereby quickly realizing reversing, so that the reversing speed of the impact rod is fast and the striking frequency is high; because the reversing valve used in the breaker hammer of the utility model is of the switch type, the reversing time is short, the impact rod responds quickly, the speed of punching and striking the drill rod is fast, and the striking frequency is high, so that the drill rod can be struck and vibrated at a higher striking frequency, thereby achieving a better crushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation methods of the present utility model, the drawings used in the description of the prior art or the specific implementation methods are briefly introduced below.

[0032] Figure 1 It is a top view schematic diagram of a breaker hammer with a high-sensitivity reversing valve according to the utility model.

[0033] Figure 2 It is a cross-sectional schematic diagram of a breaker hammer with a high-sensitivity reversing valve according to the utility model.

[0034] Figure 3 The present invention is a structural schematic diagram of a reversing valve core of an existing reversing valve being at a lower dead point.

[0035] Figure 4 The present invention is a structural schematic diagram showing that the reversing valve core of the existing reversing valve is at the top dead center.

[0036] Figure numerals: 01, reversing valve core; 02, upper channel; 03, upper hydraulic oil chamber; 04, oil return channel; 05, oil inlet channel; 06, lower hydraulic oil chamber; 07, lower channel; 1, impact body; 11, active chamber; 111, first active chamber; 112, second active chamber; 113, third active chamber; 12, reversing valve chamber; 121, first reversing valve chamber; 122, second reversing valve chamber; 123, third reversing valve chamber; 13, oil inlet; 14, first oil circuit; 15, third Second oil circuit; 16, third oil circuit; 17, fourth oil circuit; 2, impact rod; 21, first section; 22, second section; 23, third section; 24, first seal; 25, second seal; 26, third seal; 3, reversing valve; 30, valve stem; 31, first sealing gasket; 32, second sealing gasket; 33, limit block; 34, limit blocking part; 35, limit plate; 4, end cover; 41, end cover cavity; 42, external oil inlet; 43, external oil return port; 5, accumulator; 6, drill rod. DETAILED DESCRIPTION

[0037] In order to make those skilled in the art better understand the present solution, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the claims and description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

[0040] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] This embodiment provides a breaker hammer with a high-sensitivity reversing valve, such as Figure 1-2As shown, it includes a drill rod 6 and a striking body 1, wherein the drill rod 6 can be movably mounted at the front end of the striking body 1, and the tail end of the drill rod 6 is opposite to the front end of the striking rod 2, so that when the striking rod 2 moves back and forth, it can continuously strike the drill rod 6; further, it also includes an active chamber 11, a reversing valve chamber 12, a reversing valve 3, an oil inlet circuit 13, a first oil circuit 14, a second oil circuit 15, a third oil circuit 16, a fourth oil circuit 17 and an oil return circuit; wherein the active chamber 11 is arranged inside the striking body 1 for mounting the striking rod 2; when After the impact rod 2 is installed and enters the active chamber 11, the active chamber 11 is divided into a first active chamber 111, a second active chamber 112 and a third active chamber 113 which are not connected to each other; the reversing valve chamber 12 is arranged inside the impact body 1, including a first reversing valve chamber 121, a second reversing valve chamber 122 and a third reversing valve chamber 123 which are connected in sequence; the reversing valve 3 is installed inside the reversing valve chamber 12, and has a plurality of reversing valves located inside the first reversing valve chamber 121, the second reversing valve chamber 122 or the third reversing valve chamber 123. The sealing gasket inside 23, when the reversing valve 3 moves, can open or close the connecting part connecting the second reversing valve chamber 122 and the third reversing valve chamber 123; the oil inlet 13 is arranged inside the impact body 1, and one end is connected to the external oil circuit for inputting hydraulic oil; the first oil circuit 14 is used to connect the first active chamber 111 and the oil inlet 13; the second oil circuit 15 is used to connect the second reversing valve chamber 122 and the oil inlet 13; one end of the third oil circuit 16 is connected to the first reversing valve chamber 121, and the other end is in the The active chamber 11 has an opening on the inner wall; when the impact rod 2 moves inside the active chamber 11, it switches between being connected to the first active chamber 111 and being connected to the second active chamber 112; the fourth oil circuit 17 is used to connect the third reversing valve chamber 123 and the third active chamber 113; the return oil circuit is connected to the second active chamber 112 and the third active chamber 113; the force area of ​​the impact rod 2 facing the third active chamber 113 is greater than the force area of ​​the impact rod 2 facing the first active chamber 111.

[0042] In the present embodiment of the breaker hammer with a high-sensitivity reversing valve, taking the initial state of the impact rod 2 in the extended position as an example, the external hydraulic oil enters the first active chamber 111 through the oil inlet circuit 13 and the first oil circuit 14; at the same time, it enters the second reversing valve chamber 122 through the second oil circuit 15. At this time, the first reversing valve chamber 121 is connected with the second active chamber 112 through the third oil circuit 16, and then connected with the return oil circuit. The hydraulic oil entering the second reversing valve chamber 122 drives the reversing valve 3 to move toward the position of the first reversing valve chamber 121, and the sealing gasket of the reversing valve 3 closes the part connecting the second reversing valve chamber 122 and the third reversing valve chamber 123; the hydraulic oil entering the first active chamber 111 pushes the impact rod 2 retracts, during which the impact rod 2 moves toward the third active chamber 113, so that the volume of the third active chamber 113 gradually decreases, and the hydraulic oil in the third active chamber 113 enters the oil return circuit through the oil return port and is discharged; when the impact rod 2 retracts to a certain position, the tail end of the impact rod 2 closes the passage between the third active chamber 113 and the oil return circuit, one end of the third oil circuit 16 is connected to the first active chamber 111, and the hydraulic oil in the first active chamber 111 enters the first reversing valve chamber 121 through the third oil circuit 16, and pushes the reversing valve 3 to move to one side of the third reversing valve chamber 123; during the movement, the sealing gasket gradually opens the second reversing valve chamber 122 and the third reversing valve The connecting part between the chambers 123; the hydraulic oil from the oil inlet circuit 13 enters the third active chamber 113 through the second oil circuit 15, the second reversing valve chamber 122, the third reversing valve chamber 123 and the fourth oil circuit 17; at this time, the pressures of the hydraulic oils in the first active chamber 111 and the third active chamber 113 are the same. Since the force-bearing area of ​​the impact rod 2 facing the third active chamber 113 is larger than the force-bearing area of ​​the impact rod 2 facing the first active chamber 111, the force applied to the impact rod 2 facing the third active chamber 113 is greater than the force applied to the impact rod 2 facing the first active chamber 111. After the gravity of the impact rod 2 is combined, the impact rod 2 begins to move toward The first movable chamber 111 extends and moves in the direction of the first movable chamber 111; when the impact rod 2 extends to a certain distance, the connection between the third oil circuit 16 and the first movable chamber 111 is closed, and the third oil circuit 16 is connected to the second movable chamber 112. Since the second movable chamber 112 is connected to the return oil circuit, the hydraulic oil in the first reversing valve chamber 121 enters the return oil circuit through the third oil circuit 16 and the second movable chamber 112, and the oil pressure in the first reversing valve chamber 121 decreases. The reversing valve 3 moves toward the side of the first reversing valve chamber 121 with low pressure, so that the sealing gasket reseals the passage between the second reversing valve chamber 122 and the third reversing valve chamber 123, and the hydraulic oil in the oil inlet circuit 13 no longer enters the third movable chamber 113;The hydraulic oil from the oil inlet 13 enters the first active chamber 111 through the first oil passage 14, and pushes the striking rod 2 to retract again, so that the striking rod 2 can strike the drill rod 6 back and forth quickly. ;

[0043] The breaker hammer with a high-sensitivity reversing valve of this embodiment, the impact rod 2 includes a first section 21, a second section 22 and a third section 23 connected in sequence; a first seal 24 is provided between the first section 21 and the second section 22, and a second seal 25 is provided between the second section 22 and the third section 23; the outer diameter of the impact rod 2 is smaller than the outer diameter of the active cavity 11 to form a gap, and the active cavity 11 is divided into the first active cavity 111, the second active cavity 112 and the third active cavity 113 by the first seal 24 and the second seal 25.

[0044] The breaker hammer with a high-sensitivity reversing valve in this embodiment, when the striking rod 2 moves to the left ( Figure 2 When the impact rod 2 is retracted to a certain position (as shown in the figure), the first seal 24 disconnects the connection between the first active chamber 111 and the third oil circuit 16, and the hydraulic oil in the first oil circuit 14 can only enter the first active chamber 111; the third oil circuit 16 is connected to the second active chamber 112, and the hydraulic oil in the third oil circuit 16 enters the return oil circuit through the second active chamber 112. When the impact rod 2 is extended to the right to a certain position, the first seal 24 disconnects the connection between the third oil circuit 16 and the second active chamber 112, the first oil circuit 14 is connected to the third oil circuit 16 through the first active chamber 111, and the hydraulic oil in the first oil circuit 14 enters the third oil circuit 16 through the first active chamber 111. The second seal 25 seals the third active chamber 113 and the second active chamber 112 to prevent the hydraulic oil from flowing between the third active chamber 113 and the second active chamber 112.

[0045] In the breaker hammer with a high-sensitivity reversing valve of this embodiment, the outer diameter of the third section 23 is smaller than the outer diameter of the first section 21, so that the force area of ​​the impact rod 2 toward the third active chamber 113 is larger than the force area of ​​the impact rod 2 toward the first active chamber 111.

[0046] In the breaker hammer with a high-sensitivity reversing valve of this embodiment, a third seal 26 is further provided on the first section 21 , and the first active chamber 111 is formed between the first seal 24 and the third seal 26 .

[0047] In the breaker hammer with a high-sensitivity reversing valve of this embodiment, an end cover 4 is installed at the tail of the third active chamber 113, and the end cover 4 has an end cover cavity 41. The inner diameter of the end cover cavity 41 is consistent with the outer diameter of the third section 23 and can be matched and plugged in. The oil return port is arranged on the end cover 4 and is connected to the end cover cavity 41.

[0048] Furthermore, the end cover 4 is also provided with an external oil inlet 42 communicating with the oil inlet passage 13 and an external oil return port 43 communicating with the oil return passage.

[0049] In the breaker hammer with a high-sensitivity reversing valve of this embodiment, the reversing valve 3 includes a valve stem 30, a first sealing gasket 31, a second sealing gasket 32 ​​and a stopper 33: the first sealing gasket 31 is fixedly sleeved on the valve stem 30, located inside the first reversing valve chamber 121, and divides the first reversing valve chamber 121 into two parts, one part is connected with the third oil circuit 16, and the other part is connected with the second reversing valve chamber 122; the second sealing gasket 32 ​​is fixedly sleeved on the valve stem 30, located inside the first reversing valve chamber 121 or the second reversing valve chamber 122, and is used to seal or open the passage between the second reversing valve chamber 122 and the third reversing valve chamber 123; the stopper 33 is fixedly sleeved on the valve stem 30, and a stopper 34 opposite to the stopper 33 is provided inside the third reversing valve chamber 123. In this embodiment, the stopper 33 cooperates with the stopper 34 to limit the reversing valve 3. Furthermore, the reversing valve 3 further includes a limit plate 35 , which is fixedly mounted on the end of the valve stem 30 on one side of the first reversing valve cavity 121 , and is used to limit the reversing valve 3 .

[0050] In the breaker hammer with a high-sensitivity reversing valve of this embodiment, the length of the connecting portion connecting the second reversing valve chamber 122 and the third reversing valve chamber 123 is 4 mm-8 mm.

[0051] The breaker hammer with a high-sensitivity reversing valve of this embodiment further includes an accumulator 5, which is connected to the oil inlet 13. When the first active chamber 111 is supplied with oil through the oil inlet 13 and the first oil passage 14, the accumulator 5 stores energy; after the second reversing valve chamber 122 and the third reversing valve chamber 123 are connected, the accumulator 5 releases pressure, pushing the hydraulic oil into the third active chamber 113 at a greater pressure, thereby pushing the striking rod 2 to extend outward with a greater force.

[0052] Preferably, the head end of the drill rod 6 is a straight-line structure. The tail end of the drill rod 6 is provided with a cylindrical impact structure, and the impact structure provided at the head end of the impact rod 2 is a trapezoidal cylinder, and the small end of the trapezoidal cylinder is arranged opposite to the cylindrical impact structure.

[0053] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of this innovative technical solution.

Claims

1. A breaker hammer with a high-sensitivity reversing valve, comprising a drill rod (6) and a striking body (1), wherein the drill rod (6) is movably mounted at the front end of the striking body (1), the rear end of the drill rod (6) is opposite to the front end of the striking rod (2), and when the striking rod (2) moves back and forth, it can continuously strike the drill rod (6); characterized in that: Also includes: An active cavity (11) is arranged inside the impact body (1) and is used to install an impact rod (2); when the impact rod (2) is installed into the active cavity (11), the active cavity (11) is divided into a first active cavity (111), a second active cavity (112), and a third active cavity (113) which are not connected to each other; A reversing valve chamber (12), arranged inside the impact body (1), comprising a first reversing valve chamber (121), a second reversing valve chamber (122), and a third reversing valve chamber (123) which are connected in sequence; a reversing valve (3) installed inside the reversing valve chamber (12), and having sealing gaskets respectively located inside the first reversing valve chamber (121), the second reversing valve chamber (122), or the third reversing valve chamber (123); when the reversing valve (3) moves, it is capable of opening or closing a connecting portion connecting the second reversing valve chamber (122) and the third reversing valve chamber (123); An oil inlet passage (13) is arranged inside the impact body (1), one end of which is connected to an external oil passage and is used for inputting hydraulic oil; A first oil passage (14) for connecting the first movable chamber (111) and the oil inlet passage (13); A second oil circuit (15) for connecting the second reversing valve chamber (122) and the oil inlet circuit (13); a third oil passage (16), one end of which is in communication with the first reversing valve chamber (121) and the other end of which opens on the inner wall of the movable chamber (11); When the striking rod (2) moves inside the active chamber (11), it switches between being connected to the first active chamber (111) and being connected to the second active chamber (112); a fourth oil circuit (17), used for connecting the third reversing valve chamber (123) and the third active chamber (113); An oil return path, communicating with the second active chamber (112) and the third active chamber (113); The force-bearing area of ​​the impact rod (2) on the side facing the third active cavity (113) is larger than the force-bearing area of ​​the impact rod (2) on the side facing the first active cavity (111).

2. The breaker hammer with a high-sensitivity reversing valve according to claim 1 is characterized in that: The impact rod (2) comprises a first section (21), a second section (22) and a third section (23) which are connected in sequence; a first seal (24) is provided between the first section (21) and the second section (22), and a second seal (25) is provided between the second section (22) and the third section (23); the outer diameter of the impact rod (2) is smaller than the outer diameter of the active cavity (11) to form a gap, and the active cavity (11) is divided into the first active cavity (111), the second active cavity (112) and the third active cavity (113) by the first seal (24) and the second seal (25).

3. The breaker hammer with a high-sensitivity reversing valve according to claim 2 is characterized in that: The outer diameter of the third section (23) is smaller than the outer diameter of the first section (21), so that the force-bearing area of ​​the impact rod (2) facing the third active cavity (113) is larger than the force-bearing area of ​​the impact rod (2) facing the first active cavity (111).

4. The breaker hammer with a high-sensitivity reversing valve according to claim 2 is characterized in that: A third seal (26) is also provided on the first section (21), and the first active cavity (111) is formed between the first seal (24) and the third seal (26).

5. The breaker hammer with a high-sensitivity reversing valve according to claim 2 is characterized in that: An end cover (4) is installed at the rear of the third active chamber (113), the end cover (4) having an end cover chamber (41), the inner diameter of the end cover chamber (41) being consistent with the outer diameter of the third section (23) so as to be compatible and pluggable, and an oil return port being arranged on the end cover (4) and communicating with the end cover chamber (41).

6. The breaker hammer with a high-sensitivity reversing valve according to claim 2, characterized in that: The reversing valve (3) comprises: Valve stem (30); a first sealing gasket (31) fixedly sleeved on the valve stem (30) and located inside the first reversing valve chamber (121) to divide the first reversing valve chamber (121) into two parts, one part being communicated with the third oil passage (16) and the other part being communicated with the second reversing valve chamber (122); A second sealing gasket (32) fixedly sleeved on the valve stem (30); located inside the first reversing valve chamber (121) or the second reversing valve chamber (122), and used for sealing or opening a passage connecting the second reversing valve chamber (122) and the third reversing valve chamber (123); A limit block (33) is fixedly sleeved on the valve stem (30) and is located inside the third reversing valve chamber (123). A limit blocking portion (34) opposite to the limit block (33) is also provided inside the third reversing valve chamber (123).

7. The breaker hammer with a high-sensitivity reversing valve according to claim 6, characterized in that: The length of the connecting portion connecting the second reversing valve chamber (122) and the third reversing valve chamber (123) is 4 mm to 8 mm.

8. The breaker hammer with a high-sensitivity reversing valve according to claim 1, characterized in that: It also includes an accumulator (5), the accumulator (5) being in communication with the oil inlet passage (13).

9. The breaker hammer with a high-sensitivity reversing valve according to claim 1, characterized in that: The head end of the drill rod (6) is a straight-line structure.

10. The breaker hammer with a high-sensitivity reversing valve according to claim 1, characterized in that: The rear end of the drill rod (6) is provided with a cylindrical impact structure, the impact structure provided at the head end of the impact rod (2) is a trapezoidal cylinder, and the small end of the trapezoidal cylinder is arranged opposite to the cylindrical impact structure.

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