Automatic reversing valve of hydraulic breaking hammer and breaking hammer

Abstract

The utility model provides an automatic reversing valve of a hydraulic breaking hammer and the breaking hammer, and belongs to the technical field of breaking hammers, the automatic reversing valve comprises a main reversing valve and an auxiliary reversing valve, the main reversing valve is provided with a first oil inlet flow channel, a first oil return flow channel, two working flow channels and a first reversing flow channel; the auxiliary reversing valve is provided with a second oil inlet flow channel, a second oil return flow channel, a communication flow channel, a second reversing flow channel, a third reversing flow channel and a pressure relief flow channel. The second oil inlet flow channel, the second oil return flow channel and the communication flow channel are connected with the auxiliary reversing valve, the communication flow channel is communicated with the main reversing valve, the second reversing flow channel is communicated with the auxiliary reversing valve and the second oil inlet flow channel, and the third reversing flow channel is respectively communicated with the middle part of the cylinder body and the other end of the auxiliary reversing valve. According to the automatic reversing valve of the hydraulic breaking hammer, reversing operation of the main reversing valve is controlled through the auxiliary reversing valve, the large-flow main reversing valve is controlled through the small-flow auxiliary reversing valve, efficient flow control is achieved, and then production requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of breaking hammer, more specifically, relate to a kind of hydraulic breaking hammer automatic reversing valve and breaking hammer. BACKGROUND

[0002] Breaking hammer is a kind of hydraulic impact equipment widely used in engineering machinery, mainly used in rock breaking, concrete demolition, mining and other scenes.The working principle is that internal piston is driven by high-speed reciprocating motion of hydraulic system, and hydraulic energy is converted into mechanical impact energy, so that high-strength impact force is transmitted to the end of drill rod, and the breaking of hard material is realized.The core performance indicators of breaking hammer include impact frequency, impact energy and reliability, and the precise control of hydraulic reversing valve is the key to realize efficient and stable operation.At present, due to the change of construction environment, the model of breaking hammer is getting larger, so the hydraulic reversing valve part in breaking hammer is also getting larger, and the driving flow of hydraulic reversing valve is also increasing, which will cause slow driving of drill rod and cause breaking operation failure, which cannot meet the production demand. SUMMARY

[0003] The utility model aims at providing a kind of hydraulic breaking hammer automatic reversing valve and breaking hammer to solve the technical problem that the driving flow of hydraulic reversing valve in breaking hammer is increased in prior art, which leads to breaking operation failure and cannot meet the production demand.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a kind of hydraulic breaking hammer automatic reversing valve, including main reversing valve and auxiliary reversing valve, the main reversing valve is used to be installed on the cylinder body of breaking hammer;The valve body of the main reversing valve is provided with first oil inlet flow channel, first oil return flow channel, two working flow channels, first reversing flow channel for connecting the first oil inlet flow channel and one end of the valve body of the main reversing valve, the main reversing valve is used to control the up-and-down movement of piston;The auxiliary reversing valve is used to control the action of the main reversing valve, the auxiliary reversing valve has second oil inlet flow channel, second oil return flow channel, communication flow channel, second reversing flow channel, third reversing flow channel and pressure relief flow channel;One end of the second oil inlet flow channel, the second oil return flow channel and the communication flow channel is connected with the oil port of the auxiliary reversing valve, the other end of the communication flow channel is communicated with the other end of the valve body of the main reversing valve, the second reversing flow channel communicates one end of the auxiliary reversing valve with the second oil inlet flow channel, the two ends of the third reversing flow channel are communicated with the middle part of cylinder body and the other end of the auxiliary reversing valve respectively, the two ends of the pressure relief flow channel are communicated with the middle part of cylinder body and the second oil return flow channel respectively.

[0005] In a possible implementation, the valve body of the main directional valve is provided with a mounting cavity for mounting the auxiliary directional valve, the spool and the valve sleeve of the auxiliary directional valve are mounted in the mounting cavity, and the valve cover of the auxiliary directional valve is fixedly mounted at the end of the valve body of the main directional valve to close the mounting cavity and limit the spool of the auxiliary directional valve; the second oil inlet flow channel, the second oil return flow channel, the communication flow channel, the second directional flow channel, the third directional flow channel, and the pressure relief flow channel are all arranged on the valve body of the main directional valve.

[0006] In a possible implementation, the valve body of the main directional valve is further provided with an auxiliary oil cavity arranged outside the mounting cavity in parallel, and the auxiliary oil cavity is used for connecting the first oil inlet flow channel and the second oil inlet flow channel.

[0007] In a possible implementation, the spool and the valve sleeve of the main directional valve are arranged in an up-down staggered manner with the spool and the valve sleeve of the auxiliary directional valve.

[0008] In a possible implementation, the valve body of the main directional valve is further provided with a process cavity for reducing thermal deformation.

[0009] In a possible implementation, the process cavity and the mounting cavity are symmetrically arranged on the valve body of the main directional valve; the valve body of the main directional valve is further provided with an end cover for closing the process cavity, and the end cover has the same structure as the valve cover of the auxiliary directional valve.

[0010] In a possible implementation, the valve body of the main directional valve is provided with a mounting surface for cooperating with a cylinder block, and the valve body of the main directional valve is an integrated block, and the integrated block is internally provided with passages for forming the first oil inlet flow channel, the first oil return flow channel, the working flow channel, the first directional flow channel, the second oil inlet flow channel, the second oil return flow channel, the communication flow channel, the second directional flow channel, the third directional flow channel, and the pressure relief flow channel.

[0011] In a possible implementation, the valve cover of the auxiliary directional valve and the valve cover of the main directional valve are respectively located at two ends of the valve body of the main directional valve.

[0012] In a possible implementation, the main directional valve is a two-position four-way Y-type directional valve, and the auxiliary directional valve is a two-position three-way directional valve.

[0013] The hydraulic breaking hammer automatic reversing valve has the advantages that, compared with the prior art, when starting to work, high-pressure oil enters the valve body of the main reversing valve from the oil inlet P, the high-pressure oil enters the lower part of the piston in the cylinder body through the first oil inlet flow channel and the working flow channel, thereby pushing the piston to move upwards, and the low-pressure oil above the piston flows to the oil tank through the working flow channel, the first oil return flow channel and the oil return port T; in this process, the high-pressure oil enters the first reversing flow channel, thereby causing the valve sleeve of the main reversing valve to act, and the high-pressure oil enters the second oil inlet flow channel and the second reversing flow channel, thereby causing the valve core of the auxiliary reversing valve to act; with the piston gradually moving upwards, the high-pressure oil enters the middle part of the cylinder body, thereby causing the high-pressure oil to act on the other end of the auxiliary reversing valve through the third reversing flow channel, and according to the Pascal principle, the valve core in the auxiliary reversing valve reversely acts, thereby causing the high-pressure oil in the second oil inlet flow channel to pass through the flow channel in the auxiliary reversing valve and enter the communication flow channel; at this time, according to the Pascal principle, the valve sleeve in the main reversing valve reversely moves under the action of the high-pressure oil, and the oil passage in the main reversing valve is switched; at this time, the piston moves to the upper end in the cylinder body, the high-pressure oil in the first oil inlet flow channel enters the upper part of the piston through the working flow channel, and under the action of the gas in the compression gas chamber, the piston is pushed to accelerate downward movement, and the high-pressure oil below the piston is also extruded into the cylinder body above the piston, and finally the piston acts on the drill rod; at this time, the middle part of the piston is in communication with the third reversing flow channel and the pressure relief flow channel, and the hydraulic oil at the other end of the auxiliary reversing valve is relieved through the third reversing flow channel and the pressure relief flow channel, thereby causing the valve core in the auxiliary reversing valve to act reversely and the valve sleeve in the main reversing valve to act reversely, and completing the up-down movement of the piston once; with the continuous addition of the high-pressure oil into the main reversing valve, the piston is reciprocated at high frequency.

[0014] Another purpose of the utility model is to provide a breaking hammer, which comprises the hydraulic breaking hammer automatic reversing valve of any one of the above.

[0015] The breaking hammer provided by the utility model has the advantages that, by adopting the hydraulic breaking hammer automatic reversing valve, the reversing operation of the main reversing valve is controlled by means of the auxiliary reversing valve, the small-flow auxiliary reversing valve controls the large-flow main reversing valve, the rapid response control performance of the automatic reversing valve is improved, the breaking hammer can work faster and more effectively, and the production demand is met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, obviously, the drawings in the following description are only some embodiments of the present utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0017] Figure 1 The hydraulic principle diagram of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model.

[0018] Figure 2 The structure schematic of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 1 ;

[0019] Figure 3 The structure schematic of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 2 ;

[0020] Figure 4 The sectional view of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 1 ;

[0021] Figure 5 The sectional view of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 2 ;

[0022] Figure 6 The structure schematic of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 3 ;

[0023] Figure 7 The sectional view of the automatic reversing valve of the hydraulic breaking hammer is provided for the embodiments of the present utility model. Figure 3 ;

[0024] Figure 8 The structure schematic of the automatic reversing valve of the hydraulic breaking hammer installed on the breaking hammer is provided for the embodiments of the present utility model.

[0025] Among them, the various reference signs in the drawings are:

[0026] 10, main reversing valve; 11, valve body; 12, first oil inlet flow channel; 13, first oil return flow channel; 14, working flow channel; 15, first reversing flow channel; 16, installation cavity; 17, auxiliary oil cavity; 18, installation surface; 19, valve cover; 20, auxiliary reversing valve; 21, second oil inlet flow channel; 22, second oil return flow channel; 23, communication flow channel; 24, second reversing flow channel; 25, third reversing flow channel; 26, pressure relief flow channel; 30, process cavity; 31, end cover; 32, passage; 40, breaking hammer; 41, cylinder body; 42, piston. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, and are not intended to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] Please refer to Figures 1 to 8The utility model provides a hydraulic breaking hammer automatic reversing valve, including main reversing valve 10 and vice reversing valve 20, main reversing valve 10 is used to install on the cylinder body 41 of breaking hammer 40, be equipped with first oil inlet channel 12, first oil return channel 13, two working channels 14 with the valve body 11 one end of main reversing valve 10 with first oil inlet channel 12 and first reversing channel 15 for intercommunication, main reversing valve 10 is used to control piston 42 up and down movement, vice reversing valve 20 is used to control main reversing valve 10 action, vice reversing valve 20 has second oil inlet channel 21, second oil return channel 22, intercommunication channel 23, second reversing channel 24, third reversing channel 25 and pressure relief channel 26, second oil inlet channel 21, second oil return channel 22 and the one end of intercommunication channel 23 are connected with the oil port of vice reversing valve 20, the other end of intercommunication channel 23 is connected with the other end of valve body 11 of main reversing valve 10, second reversing channel 24 is connected with second oil inlet channel 21 with the one end of valve body 11 of vice reversing valve 20, and the both ends of third reversing channel 25 are connected with the middle part of cylinder body 41 and the other end of valve body 11 of vice reversing valve 20 respectively, and the both ends of pressure relief channel 26 are connected with the middle part of cylinder body 41 and second oil return channel 22 respectively.

[0032] The hydraulic breaking hammer automatic reversing valve provided by the utility model, compared with the prior art, when starting to work, high pressure oil enters the valve body 11 of the main reversing valve 10 from the oil inlet P, the high pressure oil enters the lower part of the piston 42 in the cylinder body 41 through the first oil inlet flow channel 12 and the working flow channel 14, thereby pushing the piston 42 to move upwards, and the low pressure oil above the piston 42 flows to the oil tank through the working flow channel 14, the first oil return flow channel 13 and the oil return port T; in this process, the high pressure oil enters the first reversing flow channel 15, thereby making the valve sleeve of the main reversing valve 10 act, and the high pressure oil enters the second oil inlet flow channel 21 and the second reversing flow channel 24, thereby making the valve core of the auxiliary reversing valve 20 act; with the piston 42 gradually moving upwards, the high pressure oil enters the middle part of the cylinder body 41, thereby making the high pressure oil act on the other end of the auxiliary reversing valve 20 through the third reversing flow channel 25, and according to the Pascal principle, the valve core in the auxiliary reversing valve 20 reversely acts, thereby making the high pressure oil in the second oil inlet flow channel 21 pass through the flow channel in the auxiliary reversing valve 20 and enter the communication flow channel 23; at this time, according to the Pascal principle, the high pressure oil pushes the valve sleeve in the main reversing valve 10 to reversely move, and switches the oil path in the main reversing valve 10; at this time, the piston 42 moves to the upper end in the cylinder body 41, the high pressure oil in the first oil inlet flow channel 12 enters the upper part of the piston 42 through the working flow channel 14, and is pushed to accelerate to move downwards under the action of the gas in the compression gas chamber, and the high pressure oil below the piston 42 is also extruded to the cylinder body 41 above the piston 42, and finally the piston 42 acts on the drill rod; at this time, the middle part of the piston 42 is in communication with the third reversing flow channel 25 and the pressure relief flow channel 26, the hydraulic oil at the other end of the auxiliary reversing valve 20 passes through the third reversing flow channel 25 and the pressure relief flow channel 26 and is relieved, thereby making the valve core in the auxiliary reversing valve 20 act reversely and the valve sleeve in the main reversing valve 10 act reversely, and completing the up-down movement of the piston 42 once; with the continuous addition of the high pressure oil in the main reversing valve 10, the piston 42 is high-frequency reciprocated upwards and downwards. In this way, the reversing operation of the main reversing valve 10 is controlled by means of the auxiliary reversing valve 20, the small-flow auxiliary reversing valve 20 controls the large-flow main reversing valve 10, efficient flow control is realized, the response speed of this way is relatively fast, quick switching and adjusting can be realized, and therefore the production demand is met.

[0033] Please refer to Figures 1 to 5, as a kind of specific embodiment of the automatic reversing valve of hydraulic breaking hammer provided by the utility model, installation cavity 16 for installing auxiliary reversing valve 20 is opened on the valve body 11 of main reversing valve 10, the valve core and valve sleeve of auxiliary reversing valve 20 are installed in installation cavity 16, and the valve cover 19 of auxiliary reversing valve 20 is fixedly installed at the end of the valve body 11 of main reversing valve 10, for closing installation cavity 16 and limiting the valve core of auxiliary reversing valve 20;Second oil inlet flow channel 21, second oil return flow channel 22, communication flow channel 23, second reversing flow channel 24, third reversing flow channel 25 and pressure relief flow channel 26 are all arranged on the valve body 11 of main reversing valve 10;By the mode that installation cavity 16 is opened on the valve body 11 of main reversing valve 10, the valve core and valve sleeve of auxiliary reversing valve 20 are all installed in installation cavity 16, so that auxiliary reversing valve 20 and main reversing valve 10 share a valve body 11, and the integration effect of auxiliary reversing valve 20 and main reversing valve 10 is achieved.At the same time, second oil inlet flow channel 21, second oil return flow channel 22, communication flow channel 23, second reversing flow channel 24, third reversing flow channel 25 and pressure relief flow channel 26 connected with auxiliary reversing valve 20 are all opened in the valve body 11 of main reversing valve 10, so that the whole automatic reversing valve structure is compact, and the sealing property is also higher, which provides reliable guarantee for the stable work of hydraulic equipment.

[0034] Please refer to Figure 4 and Figure 5 , as a kind of specific embodiment of the automatic reversing valve of hydraulic breaking hammer provided by the utility model, auxiliary oil cavity 17 arranged outside installation cavity 16 in parallel is also provided on the valve body 11 of main reversing valve 10, and auxiliary oil cavity 17 is used for connecting first oil inlet flow channel 12 and second oil inlet flow channel 21;After auxiliary reversing valve 20 is installed on the valve body 11 of main reversing valve 10, a certain space of valve body 11 is occupied, then multiple channels 32 are arranged to make main reversing valve 10, auxiliary reversing valve 20 and cylinder body 41 communicate, which can easily cause a certain mutual interference between multiple channels 32.Under this way, auxiliary oil cavity 17 is arranged on main reversing valve 10, and auxiliary oil cavity 17 is arranged in parallel with installation cavity 16, so that auxiliary oil cavity 17 is used as transition, the interference problem of multiple channels 32 on valve body 11 is reduced and eliminated, and the smooth flow of oil between auxiliary oil cavity 17, first oil inlet flow channel 12 and second oil inlet flow channel 21 is ensured.

[0035] Please refer to Figure 2 and Figure 3, as a kind of specific embodiment of the automatic reversing valve of hydraulic breaking hammer provided by the utility model, the valve core and valve sleeve on the main reversing valve 10 are staggered with the valve core and valve sleeve of the secondary reversing valve 20; a mounting cavity 16 and a containing cavity staggered with the mounting cavity 16 are opened on the valve body 11 of the main reversing valve 10, wherein the valve core and valve sleeve of the secondary reversing valve 20 are installed in the mounting cavity 16, and the valve core and valve sleeve of the main reversing valve 10 are installed in the containing cavity; by this kind of staggered mode, the space of the valve body 11 of the main reversing valve 10 can be fully and effectively utilized. By using this structure, it is convenient to arrange multiple channels 32 on the valve body 11 of the main reversing valve 10, so that the main reversing valve 10, the secondary reversing valve 20 and the cylinder body 41 are connected.

[0036] Please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , as a kind of specific embodiment of the automatic reversing valve of hydraulic breaking hammer provided by the utility model, the valve body 11 of the main reversing valve 10 is also provided with a process cavity 30 for reducing thermal deformation; the process cavity 30 is arranged to reduce the influence of thermal deformation on the performance of the main reversing valve 10 to the greatest extent. In the key thermal deformation area of the valve body 11, the process cavity 30 can effectively absorb and disperse heat, thereby reducing the deformation degree of the valve body 11 due to temperature rise. At the same time, the process cavity 30 improves its heat dissipation performance, so that heat can be dissipated more quickly.

[0037] Please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , as a kind of specific embodiment of the automatic reversing valve of hydraulic breaking hammer provided by the utility model, the process cavity 30 and the mounting cavity 16 are symmetrically arranged on the valve body 11 of the main reversing valve 10; the valve body 11 of the main reversing valve 10 is also provided with an end cover 31 for closing the process cavity 30, and the end cover 31 has the same structure as the valve cover 19 of the secondary reversing valve 20; so that the structure of the whole main reversing valve 10 is more compact and symmetrical, and gives people a neat beauty in appearance. By arranging the end cover 31 for closing the process cavity 30, foreign matters can be effectively prevented from entering the process cavity 30, so that the internal working environment is clean and stable, the end cover 31 has the same structure as the valve cover 19 of the secondary reversing valve 20, and the appearance is more beautiful. At the same time, the end cover 31 has the same structure as the valve cover 19 of the secondary reversing valve 20, which means that the same accessories can be used when replacing or repairing, improving the convenience and efficiency of maintenance and reducing the cost. And this symmetrical arrangement is also conducive to forming uniform pressure distribution inside the valve body 11, reducing the risk of failure caused by uneven pressure, and further improving the reliability and service life of the main reversing valve 10.

[0038] Please refer to Figure 2And Figure 3 As a specific embodiment of the automatic reversing valve of the hydraulic breaking hammer provided by the utility model, the valve body 11 of the main reversing valve 10 is provided with a mounting surface 18 for cooperating with the cylinder body 41, and the valve body 11 of the main reversing valve 10 is an integrated block body, the inside of the integrated block body is provided with passages 32 for forming a first oil inlet flow channel 12, a first oil return flow channel 13, a working flow channel 14, a first reversing flow channel 15, a second oil inlet flow channel 21, a second oil return flow channel 22, a communication flow channel 23, a second reversing flow channel 24, a third reversing flow channel 25 and a pressure relief flow channel 26; the passages 32 are staggered and orderly distributed in the inside of the integrated block body, and the sealing property and the flow property between the flow channels are ensured through a precise machining process. The cooperating mounting of the mounting surface 18 and the cylinder body 41 is close and stable, and can withstand various pressures and impact forces generated in the working process. The integrated block body mode makes the whole main reversing valve 10 small in volume, short in hydraulic oil flow route and high in integration, and can effectively improve the working efficiency and reliability of the hydraulic system.

[0039] Please refer to Figure 2 And Figure 3 As a specific embodiment of the automatic reversing valve of the hydraulic breaking hammer provided by the utility model, the valve cover 19 of the auxiliary reversing valve 20 and the valve cover 19 of the main reversing valve 10 are respectively located at both ends of the valve body 11 of the main reversing valve 10; through this mounting mode, the valve cover 19 of the auxiliary reversing valve 20 and the valve cover 19 of the main reversing valve 10 will not interfere with each other, so that the valve body 11 of the main reversing valve 10 is compact in structure. While fully utilizing the inside space of the valve body 11 of the main reversing valve 10, the accurate and firm installation of the valve cover 19 of the auxiliary reversing valve 20 and the valve cover 19 of the main reversing valve 10 is ensured. The valve cover 19 of the auxiliary reversing valve 20 is fixedly connected with the valve body 11 of the main reversing valve 10 through bolts, so as to ensure the sealing property between the two; the valve cover 19 of the main reversing valve 10 is also tightly connected with the valve body 11 of itself through bolts, so as to prevent the leakage of hydraulic oil. In the working process, the valve core or the valve sleeve is limited and fixed through the valve cover 19.

[0040] Please refer to Figure 1, as a specific embodiment of the hydraulic breaking hammer automatic reversing valve provided by the utility model, the main reversing valve 10 is a two-position four-way Y-type reversing valve, and the auxiliary reversing valve 20 is a two-position three-way reversing valve; the two-position three-way reversing valve is used as the auxiliary reversing valve 20, the second reversing flow channel 24 and the third reversing flow channel 25 are used to control the on-off state of the second oil inlet flow channel 21 and the communication flow channel 23, and then the displacement of the valve sleeve in the main reversing valve 10 is controlled quickly to achieve the reversing purpose. The two-position four-way Y-type reversing valve is used as the main reversing valve 10, the piston 42 in the cylinder body 41 can be controlled to move upwards, the Y-type function of the main reversing valve 10 is used, high-pressure hydraulic oil can enter the upper side of the piston 42 quickly through the working flow channel 14 after the main reversing valve 10 is reversed, and then the piston 42 can be moved downwards quickly by combining nitrogen.

[0041] Please refer to Figure 8 The utility model embodiment further provides a breaking hammer 40, the breaking hammer 40 includes any one hydraulic breaking hammer automatic reversing valve described above.

[0042] The breaking hammer 40 provided by the utility model adopts the hydraulic breaking hammer automatic reversing valve described above, therefore, the reversing operation of the main reversing valve 10 is controlled by the auxiliary reversing valve 20, the main reversing valve 10 with large flow is controlled by the auxiliary reversing valve 20 with small flow, the quick response control performance of the automatic reversing valve is improved, the breaking hammer 40 can work faster and more effectively, and the production demand can be met.

[0043] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hydraulic breaking hammer automatic reversing valve, characterized in that, The hydraulic breaking hammer automatic reversing valve comprises a main reversing valve and a secondary reversing valve, the main reversing valve is arranged on a cylinder body of the breaking hammer, a first oil inlet flow channel, a first oil return flow channel, two working flow channels, a first reversing flow channel for connecting the first oil inlet flow channel and one end of a valve body of the main reversing valve are arranged on the valve body of the main reversing valve, the main reversing valve is used for controlling up-down movement of a piston, the secondary reversing valve is used for controlling action of the main reversing valve, the secondary reversing valve has a second oil inlet flow channel, a second oil return flow channel, a connecting flow channel, a second reversing flow channel, a third reversing flow channel and a pressure relief flow channel, one end of the second oil inlet flow channel, the second oil return flow channel and the connecting flow channel is connected with an oil port of the secondary reversing valve, the other end of the connecting flow channel is connected with the other end of the valve body of the main reversing valve, the second reversing flow channel connects one end of the secondary reversing valve with the second oil inlet flow channel, the third reversing flow channel has two ends connected with a middle part of the cylinder body and the other end of the secondary reversing valve respectively, and the pressure relief flow channel has two ends connected with the middle part of the cylinder body and the second oil return flow channel respectively.

2. The hydraulic breaking hammer automatic reversing valve of claim 1, wherein, An installation cavity for installing the secondary reversing valve is arranged on the valve body of the main reversing valve, a valve core and a valve sleeve of the secondary reversing valve are installed in the installation cavity, and a valve cover of the secondary reversing valve is fixedly installed at an end of the valve body of the main reversing valve, used for closing the installation cavity and limiting the valve core of the secondary reversing valve, the second oil inlet flow channel, the second oil return flow channel, the connecting flow channel, the second reversing flow channel, the third reversing flow channel and the pressure relief flow channel are arranged on the valve body of the main reversing valve.

3. The hydraulic breaking hammer automatic reversing valve of claim 2, wherein, An auxiliary oil cavity arranged outside the installation cavity is further arranged on the valve body of the main reversing valve, and the auxiliary oil cavity is used for connecting the first oil inlet flow channel and the second oil inlet flow channel.

4. The hydraulic breaking hammer automatic reversing valve of claim 2, wherein, The valve core and the valve sleeve of the main reversing valve are staggered with the valve core and the valve sleeve of the secondary reversing valve.

5. The hydraulic breaking hammer automatic reversing valve of claim 2, wherein, A process cavity for reducing thermal deformation is further arranged on the valve body of the main reversing valve.

6. The hydraulic breaking hammer automatic reversing valve of claim 5, wherein, The process cavity and the installation cavity are symmetrically arranged on the valve body of the main reversing valve, an end cover for closing the process cavity is further arranged on the valve body of the main reversing valve, and the end cover has the same structure as the valve cover of the secondary reversing valve.

7. The hydraulic breaking hammer automatic reversing valve of claim 2, wherein, An installation surface for cooperating with the cylinder body is arranged on the valve body of the main reversing valve, and the valve body of the main reversing valve is an integrated block, and the integrated block is internally provided with passages for forming the first oil inlet flow channel, the first oil return flow channel, the working flow channels, the first reversing flow channel, the second oil inlet flow channel, the second oil return flow channel, the connecting flow channel, the second reversing flow channel, the third reversing flow channel and the pressure relief flow channel.

8. The hydraulic breaking hammer automatic reversing valve of claim 1, wherein, The valve cover of the secondary reversing valve and the valve cover of the main reversing valve are respectively arranged at two ends of the valve body of the main reversing valve.

9. The hydraulic breaking hammer automatic reversing valve of claim 1, wherein, The main reversing valve is a two-position four-way Y-type reversing valve, and the secondary reversing valve is a two-position three-way reversing valve.

10. A breaking hammer characterized in that, The hydraulic breaking hammer automatic reversing valve comprises the hydraulic breaking hammer automatic reversing valve according to any one of claims 1-9.

Images