Hydraulic compensation control valve group, rock drill and its drill rod fast clamping hydraulic system and drill rod connecting and disconnecting method

Abstract

The application discloses a hydraulic compensation control valve group, a rock drill and a drill rod fast clamping hydraulic system and a drill rod connecting and unloading method, and belongs to the technical field of rock drill hydraulic systems, wherein the hydraulic system comprises the hydraulic compensation control valve group, and the hydraulic compensation control valve group is connected with a clamping oil cylinder and an oil supply part; the hydraulic compensation control valve group comprises a hydraulic compensation control valve group, a hydraulic control check valve a and a clamping rod check valve; the inlet of the clamping rod check valve is externally connected, the outlet thereof is divided into at least two paths, at least one path is externally connected, and at least one path is connected with the inlet of the hydraulic control check valve a; the outlet of the hydraulic control check valve a is externally connected, the control oil port thereof is connected with the inlet of the clamping rod check valve, and the control oil port is used for controlling the hydraulic control check valve a to be closed when oil is positively fed. The application can meet the oil supply requirement of the clamping oil cylinder when the hydraulic rock drill connects and unloads the drill rod, and relatively fast clamping of the drill rod is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic system of rock drill, in particular to a hydraulic compensation control valve group, a rock drill and a quick clamping hydraulic system of drill rod of the rock drill and a method for connecting and disconnecting drill rod. BACKGROUND

[0002] In the traditional technology, the rock drilling equipment used in most domestic underground mining mines mainly includes electric coal drills, rock electric drills or pneumatic rock drills. These devices generally have the disadvantages of low efficiency and poor working environment. Some large mines use comprehensive excavators or rock drilling rigs, which have the disadvantages of occupying many devices, complex system, high failure rate, large maintenance workload and low efficiency. The hydraulic rock drill has been widely applied due to its high efficiency, relatively simple structure and operation, and has been applied to engineering blasting hole drilling operations such as metallurgy, coal, building materials, railway, water and electricity construction, national defense construction, and geotechnical anchoring engineering of water and electricity, transportation, energy and urban construction foundation support.

[0003] When the hydraulic rock drill connects and disconnects the drill rod, the drill rod needs to be clamped by the clamping jaw first to prevent the drill rod from falling into the hole drilled by the drill, and also to prevent the drill rod from rotating when tightening or disassembling the thread. However, due to the relatively large clamping force of the drill rod, the cylinder diameter of the clamping cylinder used is also relatively large, and the flow of the hydraulic system supplying oil to the cylinder is also limited, which causes the cylinder to move slowly when clamping, resulting in a long waiting time and affecting the work efficiency. Therefore, how to improve the clamping efficiency of the drill rod is of great significance to further ensure the work efficiency of the rock drill.

[0004] After searching, the patent literature with the Chinese patent application number 201821123843.0 and the authorization announcement date of February 1, 2019 discloses an automatic drill rod adding hydraulic control system of rock drilling rig, which comprises a rock drill advancing cylinder, a connecting sleeve clamping cylinder, an oil inlet throttle valve, a manual reversing valve one and a manual reversing valve two. Two oil ports of the manual reversing valve one are connected with the one-way throttle valve respectively, and then connected with two oil chambers of the rock drill advancing cylinder. A rock drill advancing control valve provided by the rock drilling rig is arranged on the pipeline connected with the two oil chambers. Two oil ports of the manual reversing valve two are connected with two oil chambers of the connecting sleeve clamping cylinder. The scheme realizes the connection and disconnection of the drill rod through hydraulic control, and improves the construction efficiency. However, the problem of slow speed of the drill rod clamping cylinder of the hydraulic rock drill when clamping and long waiting time still exists. SUMMARY

[0005] 1. Technical problem to be solved by the present application

[0006] The present application provides a hydraulic compensation control valve group, which can solve the problem of slow clamping speed caused by limited oil supply when the existing hydraulic rock drill clamps the drill rod.

[0007] The present application also provides a rock drill rod fast clamping hydraulic system, which adopts the above-mentioned hydraulic compensation control valve group, can meet the oil supply demand of the clamping oil cylinder when the hydraulic rock drill clamps the drill rod, and realizes relatively fast clamping of the drill rod.

[0008] The present application also provides a rock drill rod fast clamping hydraulic system, which adopts the above-mentioned hydraulic compensation control valve group, can meet the oil supply demand of the clamping oil cylinder when the hydraulic rock drill clamps the drill rod, and realizes relatively fast clamping of the drill rod.

[0009] The present application also provides a rock drill rod fast clamping hydraulic system, which adopts the above-mentioned hydraulic compensation control valve group, can meet the oil supply demand of the clamping oil cylinder when the hydraulic rock drill clamps the drill rod, and realizes relatively fast clamping of the drill rod.

[0010] 2. Technical scheme

[0011] In order to achieve the above-mentioned purpose, the present application provides a hydraulic compensation control valve group, which comprises a hydraulic control check valve a and a check valve; the inlet of the check valve is externally connected, and its outlet is divided into at least two paths, at least one of which is externally connected, and at least one is connected to the inlet of the hydraulic control check valve a; the outlet of the hydraulic control check valve a is externally connected, and its control oil port is connected to the inlet of the check valve, and the control oil port is used to control the closing of the hydraulic control check valve a when the oil enters in the positive direction.

[0012] Further, the inlet and outlet of the check valve are connected in parallel with a throttle hole or a throttle valve.

[0013] A rock drill rod fast clamping hydraulic system, comprising a rod clamping oil supply part and a clamping oil cylinder; the rod clamping oil supply part is used to provide pressure oil for the clamping oil cylinder, and further comprises the above-mentioned hydraulic compensation control valve group; the outlet of the hydraulic control check valve a is connected to the rod cavity of the rod clamping oil supply part and the clamping oil cylinder; the outlet of the check valve is connected to the rod cavity of the clamping oil cylinder, and its inlet is connected to the rod clamping oil supply part.

[0014] Further, the rod clamping oil supply part comprises a rod connecting and disconnecting oil pump, a rod clamping control valve and a rod clamping hydraulic lock; the inlet of the rod connecting and disconnecting oil pump is connected to the oil tank, and its outlet is connected to the P port of the rod clamping control valve; the T port of the rod clamping control valve is connected to the oil tank, and the rod clamping hydraulic lock is connected to two oil outlets thereof, and the inlet of the check valve and the outlet of the hydraulic control check valve a are connected through the rod clamping hydraulic lock.

[0015] Further, it further comprises a rod disconnecting control oil path part; the rod disconnecting control oil path part comprises a rod disconnecting control valve, a rod disconnecting hydraulic lock and a rod disconnecting oil cylinder connected in sequence, and the inlet of the rod disconnecting control valve is connected to the outlet of the rod connecting and disconnecting oil pump.

[0016] Further, the dust removal control oil path part further comprises a dust removal control valve and a dust removal motor, the P port of the dust removal control valve is connected to the rod unloading pump, and at least two oil outlets of the dust removal control valve are connected to the dust removal motor, the rod unloading control valve and / or the clamp rod control valve.

[0017] Further, the dust removal control oil path part further comprises a dust removal control valve and a dust removal motor, the P port of the dust removal control valve is connected to the rod unloading pump, and at least two oil outlets of the dust removal control valve are connected to the dust removal motor, the rod unloading control valve and / or the clamp rod control valve.

[0018] A rock drill comprises an upper drill rod clamping mechanism for clamping an upper drill rod and a lower drill rod clamping mechanism for clamping a lower drill rod, and adopts the rock drill rod quick clamping hydraulic system described above; the clamp rod oil supply part and the clamping oil cylinder have at least two groups, at least one group is used for hydraulically controlling the upper drill rod clamping mechanism, and the other at least one group is used for hydraulically controlling the lower drill rod clamping mechanism.

[0019] A rock drill rod unloading method adopts the rock drill rod quick clamping hydraulic system described above, and the operation steps are as follows:

[0020] When the drill rod needs to be clamped during the drill rod unloading operation, the clamp rod oil supply part provides pressure oil, the pressure oil enters the rodless chamber of the clamping oil cylinder, and the piston is driven to move to the side of the rod chamber; the pressure oil in the rod chamber is supplemented into the rodless chamber of the clamping oil cylinder through the hydraulic control check valve a, the movement of the piston to the side of the rod chamber of the clamping oil cylinder is accelerated, and the clamping action is completed.

[0021] When the drill rod needs to be released during the drill rod unloading operation, the clamp rod oil supply part provides pressure oil, the pressure oil enters the rod chamber of the clamping oil cylinder through the check valve, and the piston is driven to move to the side of the rodless chamber; at the same time, the pressure oil enters the control oil port of the hydraulic control check valve a, so that the hydraulic control check valve a remains in a closed state, the pressure oil cannot enter the rodless chamber of the clamping oil cylinder through the hydraulic control check valve a, and the pressure oil in the rodless chamber of the clamping oil cylinder flows back to the oil tank.

[0022] Further, the throttle hole or the throttle valve is connected in parallel between the inlet and the outlet of the check valve.

[0023] When the clamping oil cylinder clamps the drill rod, the rod chamber of the clamping oil cylinder is communicated with the oil tank through the throttle hole or the throttle valve, and the pressure in the rod chamber of the clamping oil cylinder is removed.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0026] (1) The hydraulic compensation control valve group of the application controls the control oil port to control the liquid control check valve a to close when the liquid control check valve a is in the positive direction, and the check valve is used for the oil inlet of the external outlet, the control oil port of the liquid control check valve a controls the liquid control check valve a to close when the liquid control check valve a is in the positive direction, the pressure oil enters the external oil circuit of the liquid control check valve a through the oil inlet of the liquid control check valve a, the external oil circuit is compensated by the hydraulic pressure, the oil supply is increased, and then the speed of the clamping oil cylinder clamping the drill rod is increased.

[0027] (2) The inlet and outlet of the check valve of the hydraulic compensation control valve group of the application are connected in parallel with a throttle hole or a throttle valve, when there is no oil return in the rod cavity of the clamping oil cylinder, the pressure of the rod cavity of the clamping oil cylinder can be relieved through the throttle hole or the throttle valve at this time, and at the same time the liquid control check valve a prevents the pressure oil in the rodless cavity from entering the rod cavity, thereby maintaining the pressure in the rodless cavity, so that the maximum clamping force of the clamping oil cylinder clamping the drill rod can be effectively guaranteed.

[0028] (3) The rock drill drill rod fast clamping hydraulic system of the application comprises a hydraulic compensation control valve group, the outlet of the liquid control check valve a in the hydraulic compensation control valve group is connected to the oil supply part of the clamping rod and the rodless cavity of the clamping oil cylinder, when the drill rod is clamped, the rodless cavity of the clamping oil cylinder is supplied with oil, thereby driving the clamping oil cylinder to make the clamping jaw close to the drill rod, and the oil return of the rod cavity of the clamping oil cylinder is combined into the rodless cavity through the liquid control check valve (liquid control closed control oil port), thereby compensating the oil supply of the rodless cavity, meeting the oil supply demand of the clamping oil cylinder clamping the drill rod when the hydraulic rock drill connects or disconnects the drill rod, and realizing relatively fast clamping of the drill rod.

[0029] (4) The rock drill drill rod fast clamping hydraulic system of the application, the clamping rod control valve can adjust and reverse the pressure oil pumped by the rod dismounting pump, the clamping rod hydraulic lock can prevent leakage, ensure the stability of the piston of the heavy clamping oil cylinder, and ensure the normal work of the clamping oil cylinder.

[0030] (5) The rock drill drill rod fast clamping hydraulic system of the application, the rod dismounting cylinder of the rod dismounting control oil circuit part can dismount the upper and lower two connected drill rods under the action of the rod dismounting control valve, and the rod dismounting hydraulic lock can prevent leakage, and ensure the normal work of the rod dismounting cylinder.

[0031] (6) The rock drill drill rod fast clamping hydraulic system of the application, the dust removal control valve of the dust removal control oil circuit part controls the work of the dust removal motor, and the dust generated when the drill rod is clamped is removed; the dust catcher cover control valve controls the oil inlet and outlet of the rod cavity and the rodless cavity of the dust catcher cover oil cylinder, thereby controlling the lifting of the dust catcher cover, adjusting the position of the dust catcher cover, and capturing and collecting the dust generated when the drill rod is clamped.

[0032] (7) The rock drill of the present application can quickly realize the clamping action of the upper drill rod clamping mechanism and the lower drill rod clamping mechanism through the oil supply part of the drill rod quick clamping hydraulic system and the clamping oil cylinder, thereby improving the working efficiency of the rock drill.

[0033] (8) The method for connecting and disconnecting the drill rod of the rock drill of the present application, when clamping the drill rod, the rod cavity pressure oil of the clamping oil cylinder is supplemented into the rodless cavity of the clamping oil cylinder through the hydraulic control check valve a, so as to accelerate the movement of the piston of the clamping oil cylinder to the side of the rod cavity, and complete the clamping action; when releasing the drill rod, the pressure oil enters the control oil port of the hydraulic control check valve a, so that the hydraulic control check valve a remains in the closed state, the pressure oil cannot enter the rodless cavity of the clamping oil cylinder through the hydraulic control check valve a, and the pressure oil in the rodless cavity of the clamping oil cylinder flows back to the oil tank; the hydraulic control check valve a is beneficial to realize the relatively quick connection and disconnection of the drill rod of the rock drill. BRIEF DESCRIPTION OF DRAWINGS

[0034] In the drawings, the size and proportion do not represent the actual size and proportion of the product. The drawings are merely illustrative, and some unnecessary elements or features are omitted for the sake of clarity.

[0035] In the description of the present application, it should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0036] Figure 1 is a structure schematic diagram of the drill rod mechanism of the prior art rock drill;

[0037] Figure 2 is a hydraulic principle diagram of the drill rod quick clamping hydraulic system of the present application;

[0038] Figure 3 is a hydraulic principle diagram of the drill rod clamping control oil circuit part of the present application;

[0039] Figure 4 is a hydraulic principle diagram of the rod dismounting control oil circuit part of the present application;

[0040] Figure 5 is a hydraulic principle diagram of the dust removal control oil circuit part of the present application;

[0041] Figure 6 is a principle diagram of the dust removal control valve and the dust catcher control valve of the present application;

[0042] Figure 7 is a hydraulic principle diagram of the rotation box control oil circuit part of the present application;

[0043] Figure 8 is a hydraulic principle diagram of the drill rod pushing control oil circuit part of the present application.

[0044] The illustration in the schematic diagram is explained by the following reference numbers:

[0045] 1, clamp rod control valve; 2, clamp rod hydraulic lock; 201, hydraulic control check valve b; 202, hydraulic control check valve c; 3, hydraulic compensation control valve group; 301, hydraulic control check valve a; 302, check valve; 303, throttle hole; 4, left clamping oil cylinder; 5, right clamping oil cylinder; 6, left clamping jaw; 7, right clamping jaw; 8, rod unloading cylinder; 9, rod unloading control valve; 10, rotary box oil pump; 11, rotary box motor; 12, rotary reduction box; 13, rotary box overflow valve; 14, rotary box hydraulic control check valve; 15, propulsion motor; 16, propulsion control valve; 17, propulsion oil pump; 18, dust removal motor; 19, dust catcher cylinder; 20, dust removal control valve; 21, dust catcher control valve; 22, dust removal check valve; 23, dust removal overflow valve; 24, rod unloading oil pump; 25, rod unloading hydraulic lock; 26, rotary box control valve; 27, drill rod clamping mechanism. DETAILED DESCRIPTION

[0046] In order to further understand the content of the present application, the present application is described in detail in combination with the drawings and examples. The description herein is only based on the preferred embodiment of the present application, and those skilled in the art can conceive other ways to realize the present application on the basis of the preferred embodiment, and the other ways also fall within the scope of the present application.

[0047] EMBODIMENT

[0048] The rock drilling equipment used in underground mining is mainly a hydraulic rock drill. The hydraulic rock drill needs to connect and unload the drill rod during drilling. Referring to Figure 1 , an existing rock drill structure is provided, and its structure is briefly described below to facilitate a detailed description of the subsequent hydraulic system. The existing rock drill generally includes a drill rod storage for storing drill rods to facilitate the loading and unloading of multiple drill rods. The drill rod storage has a propulsion motor 15, a rotary box motor 11, a rotary reduction box 12, an upper drill rod clamping mechanism 27, and a lower drill rod clamping mechanism 27 arranged from top to bottom on one side. The upper drill rod clamping mechanism 27 and the lower drill rod clamping mechanism 27 are provided with a rod unloading cylinder 8. The upper drill rod clamping mechanism 27 is used to clamp the upper drill rod, and the lower drill rod clamping mechanism 27 is used to clamp the lower drill rod. The clamp rod oil supply part and the clamping oil cylinder have at least two groups, at least one group is used to hydraulically control the upper drill rod clamping mechanism 27, and the other at least one group is used to hydraulically control the lower drill rod clamping mechanism 27. The propulsion motor 15 drives the rotary reduction box 12 to move up and down through a chain wheel and a chain, and the rotary box motor 11 drives the rotary reduction box 12 to rotate. The upper drill rod clamping mechanism 27 and the lower drill rod clamping mechanism 27 clamp the upper drill rod and the lower drill rod, respectively, and the rod unloading cylinder 8 is used to loosen the threads connecting the upper and lower drill rods. The following describes the action of the rod connecting and unloading of the rock drill during the working process.

[0049] When the first drill rod is driven into the drilled hole, a second drill rod needs to be connected above it, the connection steps of the drill rod are as follows:

[0050] (1) the first drill rod is clamped by the upper drill rod clamping mechanism 27, the rotation box motor 11 is reversed to disengage the threads between the rotation reduction box 12 and the first drill rod;

[0051] (2) the threads on the second drill rod are connected to the rotation reduction box 12, the rotation box motor 11 is forward rotated to drive the upper drill rod forward rotated, the threads below the second drill rod are connected to the threads above the first drill rod;

[0052] (3) the upper drill rod clamping mechanism 27 is loosened, and the drilling is continued;

[0053] (4) after the second drill rod is driven into the hole, the above actions are repeated to connect the third, fourth, and sixth drill rods or more.

[0054] When the drilling is completed, the drill rods need to be taken out of the hole one by one, the dismounting steps of the drill rod are as follows:

[0055] (1) the upper and lower drill rod clamping mechanisms 27 are used to clamp the upper and lower drill rods respectively;

[0056] (2) the threads between the upper and lower drill rods are loosened by the dismounting oil cylinder 8, the upper drill rod clamping mechanism 27 is loosened after the threads are loosened, and the lower drill rod clamping mechanism 27 remains clamped;

[0057] (3) the rotation box motor 11 is reversed to drive the upper drill rod to be reversed, and the threads between the upper and lower drill rods are disengaged;

[0058] (4) the upper drill rod is removed from the rotation reduction box 12, and the rotation reduction box 12 is connected to the threads of the lower drill rod;

[0059] (5) the lower drill rod clamping mechanism 27 is loosened, the push motor 15 is operated, and the lower drill rod is lifted up by reverse rotation;

[0060] (6) the above actions are repeated until all the drill rods are taken out.

[0061] The core of the embodiment is that the actions of the drill rod connection and dismounting of the rock drill are all controlled by the hydraulic system, referring to Figure 2 and Figure 3The hydraulic system includes two sets of clamp rod control oil path parts, respectively controlling the clamping of the upper and lower drill rods; the clamp rod control oil path part includes a clamp rod control valve 1, the P port of the clamp rod control valve 1 is connected to the rod unloading pump 24 through a pipeline, and the T port of the clamp rod control valve 1 is connected to the oil tank. The outlet A of the clamp rod control valve 1 is connected to the rodless cavity of the left clamping oil cylinder 4 and the right clamping oil cylinder 5 in sequence through the clamp rod hydraulic lock 2 and the hydraulic compensation control valve group 3, and the outlet B of the clamp rod control valve is connected to the rod cavity of the left clamping oil cylinder 4 and the right clamping oil cylinder 5 in sequence through the clamp rod hydraulic lock 2 and the hydraulic compensation control valve group 3. The hydraulic oil path of the clamp rod hydraulic lock 2 is constructed as the prior art, including a hydraulic control check valve b201 and a hydraulic control check valve c202, the inlets of the hydraulic control check valve b201 and the hydraulic control check valve c202 are connected to the outlets A and B of the clamp rod control valve 1 respectively, and the outlets thereof are connected to the hydraulic compensation control valve group 3.

[0062] The core design of the hydraulic compensation control valve group 3 is that it contains a hydraulic control check valve a301 and a check valve 302. The inlet of the check valve 302 is connected with the outlet B of the clamp rod hydraulic lock 2 and the clamp rod control valve 1. The outlet of the check valve 302 is divided into two ways. One way is connected with the inlet of the hydraulic control check valve a301, and the other way is connected with the rod cavity of the left and right clamp cylinders 4 and 5. The outlet of the hydraulic control check valve a301 is divided into two ways. One way is connected with the outlet A of the clamp rod hydraulic lock 2 and the clamp rod control valve 1, and the other way is connected with the rodless cavity of the left and right clamp cylinders 4 and 5. The control oil port of the hydraulic control check valve a301 is connected with the inlet of the check valve 302, and the control oil port is used to control the closing of the hydraulic control check valve a301 when the oil enters in the positive direction. The so-called closing in the positive direction means that when there is no pressure oil in the control oil port of the hydraulic control check valve a301, the pressure oil enters from the inlet of the hydraulic control check valve a301, the hydraulic control check valve a301 is opened under the action of the pressure oil, and the pressure oil flows out from the outlet. This is the opening in the positive direction. When the pressure oil is introduced into the control oil port of the hydraulic control check valve a301, the hydraulic control check valve a301 is in the positive direction, but the valve is closed, and the inlet and outlet ports are disconnected. At this time, it is the closing in the positive direction. In the specific embodiment, when the drill rod is loosened, the pressure oil is pumped out from the oil tank by the rod connecting and dismounting oil pump 24, and the pressure oil enters the rod cavity of the left and right clamp cylinders 4 and 5 from the outlet B of the clamp rod control valve 1 through the clamp rod hydraulic lock 2 and the inlet and outlet of the check valve 302 in turn. During this period, the pressure oil enters the control oil port of the hydraulic control check valve a301, and the hydraulic control check valve a301 remains in the closed state. The pressure oil cannot pass through the hydraulic control check valve a301, so the pressure oil cannot enter the rodless cavity of the left and right clamp cylinders 4 and 5. The pressure oil flows into the rod cavity of the clamp cylinder, pushes the piston rod to move in the direction of the rodless cavity, and loosens the drill rod. When the drill rod is clamped, the pressure oil is pumped out from the oil tank by the rod connecting and dismounting oil pump 24, and the pressure oil enters the rodless cavity of the left and right clamp cylinders 4 and 5 from the outlet A of the clamp rod control valve 1 through the clamp rod hydraulic lock 2 and the hydraulic compensation control valve group 3 in turn, and pushes the piston rod to move in the direction of the rod cavity. The pressure oil in the rod cavity enters the hydraulic compensation control valve group 3. Since the outlet of the check valve 302 is connected with the rod cavity, the pressure oil in the rod cavity cannot pass through the check valve 302. The pressure oil in the rod cavity enters the rodless cavity of the left and right clamp cylinders 4 and 5 through the inlet of the hydraulic control check valve a301, increases the oil supply of the rodless cavity, and further improves the speed of the clamp cylinder in clamping the drill rod. The inlet and outlet of the check valve 302 are connected in parallel with a throttling structure or device, for example, a throttling hole 303 or a throttling valve. The throttling hole 303 or the throttling valve is selected according to the mechanical structure. The throttling hole 303 saves more space. After the drill rod is clamped, the throttling hole 303 or the throttling valve releases the pressure of the rod cavity of the clamp cylinder, so as to effectively ensure that the clamping force of the clamp cylinder in clamping the drill rod is maximum. In the embodiment, the clamp rod control valve 1 can select a two-position four-way electromagnetic valve. The middle position function is Y type, and the middle A and B oil ports are pressure released.

[0063] It should be noted that the hydraulic compensation control valve group 3 should be understood as can be used in any scene which needs to realize oil compensation on the oil return path, and the above is only used as an example of the scene of the rock drill, but is not limited to this.

[0064] The rock drill also has a rod unloading control oil circuit part which cooperates with the rod clamping control oil circuit to control the rod unloading. Referring to Figure 2 and Figure 4 , the rod unloading control oil circuit part also pumps out pressure oil through the rod unloading oil pump 24, the P port of the rod unloading control valve 9 and the P port of the rod clamping control valve 1 are connected in parallel through the same oil circuit and are connected to the rod unloading oil pump 24, the outlets A and B of the rod unloading control valve 9 are connected to the rodless chamber and the rod chamber of the rod unloading oil cylinder 8 through the rod unloading hydraulic lock 25. When the rod unloading control valve 9 is in the left position, the pressure oil flows out from the outlet A of the rod unloading control valve 9, enters the rodless chamber of the rod unloading oil cylinder 8 through the rod unloading hydraulic lock 25, pushes the piston rod to move to the side of the rod chamber, and the pressure oil in the rod chamber flows back to the tank from the outlet B of the rod unloading control valve 9 through the rod unloading hydraulic lock 25. When the rod unloading control valve 9 is in the right position, the pressure oil flows out from the outlet B of the rod unloading control valve 9, enters the rod chamber of the rod unloading oil cylinder 8 through the rod unloading hydraulic lock 25, pushes the piston rod to move to the side of the rodless chamber, and the pressure oil in the rodless chamber flows back to the tank from the outlet A of the rod unloading control valve 9 through the rod unloading hydraulic lock 25. The rod unloading control valve 9 adjusts the flow direction of the pressure oil to control the action of the rod unloading oil cylinder 8 to achieve the purpose of unscrewing the threads between the upper and lower drill rods. In this embodiment, the rod unloading control valve 9 can be a two-position four-way electromagnetic valve, and the middle position can be Y-shaped, and the A and B oil ports in the middle position are pressure relief.

[0065] The rock drill will generate a large amount of dust during drilling, which seriously affects the environment, and the dust also affects the drilling construction. In order to effectively deal with the dust generated during drilling, the dust removal control oil circuit part is added on the basis of the above hydraulic system structure to control the drilling dust removal. Referring to Figure 2 , Figure 5 and Figure 6, the dust removal control valve 20 and the dust cover control valve 21 are taken as an example to be described in detail, one way of the outlet of the unloading rod oil pump 24 is connected to other valves through the working oil ports C and D of the dust removal control valve 20 and the working oil ports C and D of the dust cover control valve 21, the other valves can be valves for controlling the extension and rotation of the mechanical arm, but are not limited to this, the dust removal control valve 20 and the dust cover control valve 21 are connected in series through the working oil ports C and D. The other way of the outlet of the unloading rod oil pump 24 is divided into two ways through the dust removal check valve 22, one way is connected to the P port of the dust removal control valve 20, the outlet A of the dust removal control valve 20 is connected to the P port of the clamping rod control valve 1 and the P port of the unloading rod control valve 9, the outlet B of the dust removal control valve 20 is connected to one working oil port of the dust removal motor 18, and the other working oil port of the dust removal motor 18 is connected to the oil tank. The P port of the dust cover control valve 21 and the P port of the dust removal control valve 20 are connected in parallel, the other way of the outlet of the unloading rod oil pump 24 is connected to the P port of the dust cover control valve 21, the outlet A of the dust cover control valve 21 is connected to the rod cavity of the dust cover oil cylinder 19, and the outlet B of the dust cover control valve 21 is connected to the rodless cavity of the dust cover oil cylinder 19. The T ports of the dust removal control valve 20 and the dust cover control valve 21 are connected to the oil tank. The other oil way divided through the dust removal check valve 22 is connected to the inlet of the dust removal overflow valve 23, and the outlet of the dust removal overflow valve 23 is connected to the oil tank.

[0066] After drilling to a certain depth, the drill rod still needs to be connected, and the torque of the threaded connection of the drill rod needs to be prevented from being too large when the drill rod is connected. The rotary box control oil way part with the function of preventing the torque from being too large is also arranged in the hydraulic system, and the rotary box control oil way part is described with reference to Figure 2 and Figure 7The outlet of the rotary box oil pump 10 is connected to the P port of the rotary box control valve 26, the outlet A of the rotary box control valve 26 is connected to the oil port B of the rotary box motor 11, the outlet B of the rotary box control valve 26 is connected to the oil port A of the rotary box motor 11, and the oil port A of the rotary box motor 11 is connected to the inlet of the rotary box overflow valve 13. It should be noted that, in the embodiment, the oil port A of the rotary box motor 11 is a positive rotation oil port, which means that the rotary box motor 11 rotates in a positive direction by inputting pressure oil through the oil port, and the drill rod can be tightened. The outlet of the rotary box overflow valve 13 is connected to the outlet of the rotary box hydraulic control non-return valve 14, the inlet of the rotary box hydraulic control non-return valve 14 is connected to the oil tank, and the control oil port of the rotary box hydraulic control non-return valve 14 is connected to the clamp rod control oil path part and the rod unloading control oil path part. In the embodiment, the control oil port of the rotary box hydraulic control non-return valve 14 is connected between the clamp rod control valve 1 and the dust removal control valve 20, that is, the control oil port of the rotary box hydraulic control non-return valve 14 is connected between the P port of the clamp rod control valve 1 and the B port of the dust removal control valve 20. When the clamp rod control oil path part controls the clamping of the drill rod, the rotary box hydraulic control non-return valve 14 opens in the reverse direction, the rotary box overflow valve 13 intervenes in the work, and the working oil pressure of the rotary box motor 11 is controlled, so as to avoid that the connection torque between the two drill rods is too large and causes damage to the connection thread.

[0067] After the drilling hole reaches the specified depth, the drill rod needs to be disassembled and then taken out of the drilling hole. The drill rod needs to be taken out upward, and the push drill rod control oil path part in the hydraulic system needs to be used. Referring to Figure 2 and Figure 8 The outlet of the push oil pump 17 is connected to the P port of the push control valve 16, the outlet A and the outlet B of the push control valve 16 are respectively connected to the two working oil ports of the push motor 15, and the T port of the push control valve 16 is connected to the oil tank.

[0068] The various oil path control parts in the above hydraulic system are not isolated, and the operation of each other is linked. The operation linkage of each oil path control part will be described below in combination with the flow direction of the pressure oil in each oil path control part. In order to facilitate the description, the clamp rod control valve 1, the rod unloading control valve 9, the rotary box control valve 26 and the push control valve 16 are taken as an example of adopting a three-position four-way electromagnetic valve with a Y-shaped function in the neutral position. The actual valve group selection can be selected according to the specific hydraulic control.

[0069] In the connection of drill pipe, first, the outlet of the pipe jointing and unjointing pump 24 pumps out pressure oil, which flows into the dust removal control valve 20 through the dust removal one-way valve 22, and the dust removal control valve 20 is adjusted to the left position. At this time, the working oil ports C and D of the dust removal control valve 20 are closed, and pressure oil does not flow into other valves. The pressure oil flows into the P port of the dust removal control valve 20 and out of the outlet A to the P port of the clamp rod control valve 1, and the outlet A of the clamp rod control valve 1 discharges oil to control the clamp rod control valve 1 of the upper drill pipe clamping mechanism 27. The oil enters the rodless cavity of the left clamping oil cylinder 4 and the right clamping oil cylinder 5 through the hydraulic control one-way valve b201 of the clamp rod hydraulic lock 2, and pushes the piston rod to move to the rod cavity. The pressure oil in the rod cavity flows out and enters the rodless cavity of the left clamping oil cylinder 4 and the right clamping oil cylinder 5 through the inlet and outlet of the hydraulic control one-way valve a301 of the hydraulic compensation control valve group 3, and increases the oil supply to speed up the clamping speed of the left clamping jaw 6 and the right clamping jaw 7. Then, the outlet of the rotary box oil pump 10 discharges oil, and the rotary box control valve 26 is in the left position, the P port of which receives oil, and the outlet A discharges oil to flow into the oil port B of the rotary box motor 11. The rotary box motor 11 reverses to disengage the threads between the rotary reduction box 12 and the first drill pipe. Then, the second drill pipe is connected to the rotary reduction box 12, the outlet of the rotary box oil pump 10 discharges oil, and the rotary box control valve 26 is in the right position, the P port of which receives oil, and the outlet B discharges oil to flow into the oil port A of the rotary box motor 11. The rotary box motor 11 rotates in the positive direction to drive the drill pipe on the rotary reduction box 12 to rotate in the positive direction, and connects the threads below the second drill pipe to the threads above the first drill pipe to complete the connection of the drill pipe. It should be noted that when the rotary box motor 11 rotates in the positive direction to tighten the drill pipe threads, the control oil port of the rotary box hydraulic control one-way valve 14 receives oil, so that the rotary box hydraulic control one-way valve 14 opens in the reverse direction, and the rotary box overflow valve 13 can normally overflow to limit the working pressure of the rotary box motor 11 rotating in the positive direction, thereby limiting the torque of the rotary box motor 11 and the torque of tightening the drill pipe threads, preventing damage to the threads.

[0070] After the connection of the upper and lower drill pipes is completed, the hydraulic system controls the loosening of the upper drill pipe clamping mechanism 27, and continues to drill. When loosening, the dust removal control valve 20 is in the left position, and pressure oil is still pumped out from the pipe jointing and unjointing pump 24 to enter the P port of the clamp rod control valve 1 through the outlet A of the dust removal control valve 20. The pressure oil enters the rod cavity of the left clamping oil cylinder 4 and the right clamping oil cylinder 5 through the hydraulic control one-way valve c202 and the one-way valve 302 of the clamp rod hydraulic lock 2 in sequence from the outlet B of the clamp rod control valve 1, so that the piston rod moves to the rodless cavity, and the left clamping jaw 6 and the right clamping jaw 7 loosen the drill pipe. At the same time, the control oil port of the hydraulic control one-way valve a301 controls the hydraulic control one-way valve 302 to close, and the hydraulic control one-way valve 302 cannot receive oil in the positive direction, so that the hydraulic control one-way valve a301 is in the closed state when receiving oil in the positive direction. At this time, the pressure oil does not enter the rodless cavity of the clamping oil cylinder, but enters the rod cavity.

[0071] After the drill rod is loosened, the drilling continues, and the rod connecting and disconnection oil pump 24 still pumps oil when drilling. At this time, the dust removal control valve 20 is adjusted to the right position, the working oil ports C and D of the dust removal control valve 20 are closed, the pressure oil flows into the dust removal control valve 20 from the P port, flows out from the outlet B, and then enters the working port of the dust removal motor 18 to drive the dust removal motor 18 to work. Finally, the pressure oil enters the oil tank from the other working port of the dust removal motor 18. During the dust removal work, the pressure oil does not pass through the clamp rod control valve 1 and the rod disconnection control valve 9, so the clamp rod control oil circuit part and the rod disconnection control oil circuit part are temporarily suspended. It should be noted that before the dust removal motor 18 works, the dust catcher control valve 21 can be adjusted to the left position or the right position. At this time, the working oil ports C and D of the dust catcher control valve 21 are closed, the pressure oil flows into the dust catcher control valve 21 from the P port and flows out from the outlet A or the outlet B, and then flows into the rod cavity or the rodless cavity of the dust catcher oil cylinder 19, thereby driving the dust catcher to descend or ascend, so that the dust catcher can be adjusted to the appropriate position.

[0072] When the drilling is finished, the drill rod needs to be taken out of the hole. The clamp rod control oil circuit part and the rotary box control oil circuit part are still used when the drill rod is taken out, and their internal pressure oil flow process and principle are not repeated here. Please refer to the above connection drill rod process for analogy. The rod disconnection control oil circuit part is also needed to loosen the threads between the upper and lower drill rods. The pressure oil still comes from the rod connecting and disconnection oil pump 24, flows out from the outlet A of the dust removal control valve 20, and adjusts the rod disconnection control valve 9 to the left position. The P port of the rod disconnection control valve 9 then enters the oil, and then the pressure oil flows into the rodless cavity of the rod disconnection oil cylinder 8 from the outlet A of the rod disconnection control valve 9 through the rod disconnection hydraulic lock 25, so that the piston rod moves to the side of the rod cavity of the rod disconnection oil cylinder 8. Adjust the rod disconnection control valve 9 to the right position, and the pressure oil enters the rod cavity of the rod disconnection oil cylinder 8 from the outlet B of the rod disconnection control valve 9 through the rod disconnection hydraulic lock 25, so that the piston rod moves to the side of the rodless cavity of the rod disconnection oil cylinder 8. The rod disconnection control valve 9 reverses the pressure oil to adjust the extension and retraction of the rod disconnection oil cylinder 8, so that the rod disconnection oil cylinder 8 can loosen the threads between the upper and lower drill rods.

[0073] After the threads between the upper and lower drill rods are loosened, the drill rod control oil circuit part is needed to lift the drill rod out of the hole. The outlet of the advancing oil pump 17 pumps out pressure oil, which flows into the reverse working port of the advancing motor 15 from the outlet A of the advancing control valve 16, flows out from the other working port of the advancing motor 15 and returns to the oil tank through the outlet B of the rod disconnection control valve 9, and the advancing motor 15 rotates to lift the drill rod up. The reverse working port means that the pressure oil enters the working port of the advancing motor 15, and the rotation of the advancing motor 15 can lift the drill rod up.

[0074] The above describes the present application and its embodiments in a schematic manner, and the description is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above, without departing from the spirit of the present application, similar structural modes and embodiments can be designed without creativity, and all of them shall belong to the protection scope of the present application.

Claims

1. A hydraulic compensating control valve group, characterized in that, The hydraulic control valve group (3) comprises a hydraulic control check valve a (301) and a check valve (302); the inlet of the check valve (302) is externally connected, and the outlet is divided into at least two paths, at least one of which is externally connected, and at least one is connected with the inlet of the hydraulic control check valve a (301); the outlet of the hydraulic control check valve a (301) is externally connected, and the control oil port is connected with the inlet of the check valve (302), and the control oil port is used to control the closing of the hydraulic control check valve a (301) when the oil inlet is in the forward direction; the hydraulic control check valve a (301) prevents the pressure oil in the rodless chamber from entering the rod chamber, thereby maintaining the pressure of the rodless chamber; the check valve (302) is connected with a throttle hole (303) or a throttle valve in parallel between the inlet and the outlet, which is used to control the pressure relief of the rod chamber during clamping, while maintaining the pressure of the rodless chamber.

2. A quick clamping hydraulic system of a rock drill rod, comprising a clamping rod oil supply part and a clamping cylinder, the clamping rod oil supply part is used to supply pressure oil for the clamping cylinder, characterized in that, The hydraulic control valve group (3) of claim 1 is also included; the outlet of the hydraulic control check valve a (301) is connected with the rodless chamber of the clamping rod oil supply part and the clamping cylinder; the outlet of the check valve (302) is connected with the rod chamber of the clamping cylinder, and the inlet is connected with the clamping rod oil supply part.

3. A quick hydraulic jumbo drill rod clamping system according to claim 2, characterized in that, The clamping rod oil supply part comprises a rod loading and unloading pump (24), a clamping rod control valve (1) and a clamping rod hydraulic lock (2); the inlet of the rod loading and unloading pump (24) is connected with the oil tank, and the outlet is connected with the P port of the clamping rod control valve (1); the T port of the clamping rod control valve (1) is connected with the oil tank, and the clamping rod hydraulic lock (2) is connected on two outlets thereof, and the inlet of the check valve (302) and the outlet of the hydraulic control check valve a (301) are connected through the clamping rod hydraulic lock (2).

4. A quick hydraulic jumbo drill rod clamping system according to claim 2, characterized in that, The rod unloading control oil path part is also included; the rod unloading control oil path part comprises a rod unloading control valve (9), a rod unloading hydraulic lock (25) and a rod unloading cylinder (8) connected in sequence, and the inlet of the rod unloading control valve (9) is connected with the outlet of the rod loading and unloading pump (24).

5. A quick hydraulic jacking system for a drill rod of a rock drill according to claim 2, characterized in that, The dust removal control oil path part is also included; the dust removal control oil path part comprises a dust removal control valve (20) and a dust removal motor (18), the P port of the dust removal control valve (20) is connected with the rod loading and unloading pump (24), and the dust removal control valve (20) has at least two oil outlets, at least one of which is connected with the dust removal motor (18), and at least one of which is connected with the rod unloading control valve (9) and / or the clamping rod control valve (1).

6. A quick hydraulic jacking system for a drill rod of a rock drill according to claim 5, characterized in that, The dust removal control oil path part further comprises a dust catcher cover cylinder (19) and a dust catcher cover control valve (21); the P port of the dust catcher cover control valve (21) is connected with the rod loading and unloading pump (24), and the two oil outlets of the dust catcher cover control valve (21) are respectively connected with the rod chamber and the rodless chamber of the dust catcher cover cylinder (19).

7. A rock drill comprising an upper drill rod clamping mechanism for clamping an upper drill rod and a lower drill rod clamping mechanism for clamping a lower drill rod, characterized in that The drill rod quick clamping hydraulic system of any one of claims 2-6 is used; the clamping rod oil supply part and the clamping cylinder have at least two groups, at least one of which is used for hydraulic control of the upper drill rod clamping mechanism, and at least one of which is used for hydraulic control of the lower drill rod clamping mechanism.

8. A method for loading and unloading drill rods of a rock drill, using the drill rod quick clamping hydraulic system of any one of claims 2-6, the operation steps of which are: When the drill pipe needs to be clamped during the pipe connection and disconnection operation, the pressure oil is supplied to the pipe clamping oil supply part, and the pressure oil enters the rodless chamber of the clamping cylinder to push the piston to move to the side of the rod chamber; the pressure oil in the rod chamber is supplemented into the rodless chamber of the clamping cylinder through the hydraulic control check valve a (301), so as to accelerate the movement of the piston of the clamping cylinder to the side of the rod chamber, and the clamping action is completed; When the drill pipe needs to be released during the pipe connection and disconnection operation, the pressure oil is supplied to the pipe clamping oil supply part, and the pressure oil enters the rod chamber of the clamping cylinder through the check valve (302) to push the piston to move to the side of the rodless chamber; at the same time, the pressure oil enters the control oil port of the hydraulic control check valve a (301), so that the hydraulic control check valve a (301) remains closed, and the pressure oil cannot enter the rodless chamber of the clamping cylinder through the hydraulic control check valve a (301), and the pressure oil in the rodless chamber of the clamping cylinder flows back to the oil tank.

9. The drill pipe connection and disconnection method of the rock drill according to claim 8, wherein the inlet and the outlet of the check valve (302) are connected in parallel with the throttle hole (303) or the throttle valve in the hydraulic compensation control valve group (3); When the clamping cylinder clamps the drill pipe, the rod chamber of the clamping cylinder is connected to the oil tank through the throttle hole (303) or the throttle valve, and the pressure in the rod chamber of the clamping cylinder is released.

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