CN111075679A

CN111075679A - Hydraulic grouting pump

Info

Publication number: CN111075679A
Application number: CN201911389391.XA
Authority: CN
Inventors: 刘艳荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-28

Abstract

The invention belongs to the technical field of grouting pumps. The invention discloses a hydraulic grouting pump which comprises a shell, a main piston, an auxiliary piston and a piston rod, wherein a control chamber and a first working chamber which are mutually independent are arranged in the shell, the main piston is positioned in the control chamber, the piston rod is positioned in the shell and axially penetrates through the main piston, the main piston can drive the piston rod to axially and synchronously move, and when the main piston moves to the terminal position of the control chamber, the piston rod can axially move relative to the main piston and rotate relative to the main piston along the circumferential direction, so that two sides of the main piston are respectively and alternately communicated with high-pressure oil. The grouting pump can suck and discharge liquid under the driving of hydraulic pressure, has simple and compact structure, low manufacturing cost and high integration level, can omit the use of a reversing valve, does not need electric control, can work for a long time and has long service life.

Description

Hydraulic grouting pump

Technical Field

The invention belongs to the technical field of grouting pumps, and particularly relates to a hydraulic grouting pump.

Background

The construction drilling is a necessary method for exploring geological structures and coal bed occurrence and solving disasters such as mine gas, water, top and bottom plates and the like. The method is also an essential step for grouting and sealing the drilled hole, and at present, the common equipment for grouting and sealing the drilled hole in the mine is a pneumatic grouting pump. The pneumatic grouting pump mainly utilizes underground compressed air to push a cylinder piston to reciprocate in a cylinder, and the cylinder piston drives a grouting piston to reciprocate so as to realize the actions of sucking and grouting slurry. However, the existing pneumatic grouting pump can cause limited grouting pressure under the condition of insufficient power of underground compressed air, so that compression equipment and a compressed air pipeline are often required to be independently equipped, the cost of grouting and hole sealing is increased, and the existing pneumatic grouting pump is complex in transmission device, high in failure rate, heavy and bulky in body shape and difficult to transfer underground. In order to solve the problem, a hydraulic grouting pump appears in the prior art, although the hydraulic grouting pump can overcome some defects of a pneumatic grouting pump, a hydraulic flow distribution device needs to be specially configured, the whole system is complex, and the hydraulic grouting pump is high in failure rate and inconvenient to move in the using process.

Disclosure of Invention

In order to solve the problems of the grouting pump with the conventional structure, the invention provides a hydraulic grouting pump with a brand-new structure. The hydraulic grouting pump comprises a shell, a main piston, an auxiliary piston and a piston rod; the auxiliary piston is fixedly connected with the piston rod and moves synchronously;

the device comprises a shell, a first working chamber, a second working chamber, a third working chamber, a fourth working chamber, a fifth working chamber and a sixth working chamber, wherein the control chamber and the first working chamber are mutually independent;

the main piston is positioned in the control chamber and divides the control chamber into a first control chamber and a second control chamber which are independent of each other; the P port and the T port are respectively communicated with the first control chamber and the second control chamber in an alternating mode, when the P port is communicated with the first control chamber, the T port is communicated with the second control chamber, and when the P port is communicated with the second control chamber, the T port is communicated with the first control chamber;

the piston rod is sleeved on the guide rod, one end of the piston rod is in sliding fit with the main piston, the other end of the piston rod penetrates through the main piston and then is fixedly connected with the auxiliary piston, the main piston can drive the piston rod to axially and synchronously move, and meanwhile, the piston rod can axially move relative to the main piston and rotate in the circumferential direction relative to the main piston in the relative axial movement process; when the main piston drives the piston rod to axially move to a terminal position in the control chamber, the piston rod axially moves relative to the main piston and rotates relative to the main piston along the circumferential direction to complete the communication relation switching of the P port and the T port with the first control chamber and the second control chamber.

Preferably, the main piston is provided with a first oil path, a second oil path, a third oil path and a fourth oil path, and the piston rod is provided with a first through flow groove and a second through flow groove which are formed along the axial direction;

one end of the first oil passage is communicated with the first control chamber; one end of the second oil passage is communicated with the second control chamber; one end of the third oil path is communicated with the port P, and the other end of the third oil path is selectively communicated with the first through flow groove and the second through flow groove; one end of the fourth oil path is communicated with the T port, and the other end of the fourth oil path is selectively communicated with the first through flow groove and the second through flow groove;

when the piston rod moves along with the main piston towards the direction of the first control chamber, the first oil path is communicated with the fourth oil path through a first through flow groove, and the second oil path is communicated with the third oil path through a second through flow groove; when the piston rod moves along with the main piston towards the direction of the second control chamber, the first oil path is communicated with the third oil path through the first through flow groove, and the second oil path is communicated with the fourth oil path through the second through flow groove;

when the piston rod moves relative to the main piston in the direction of the first control chamber, the first oil path is switched to be communicated with the third oil path through the first through flow groove, and the second oil path is switched to be communicated with the fourth oil path through the second through flow groove; when the piston rod moves towards the second control chamber relative to the main piston, the second oil path is switched to the second through-flow groove to be communicated with the third oil path, and the first oil path is switched to be communicated with the fourth oil path through the first through-flow groove.

Preferably, the outer surface of the main piston is provided with a first oil groove and a second oil groove which are axially formed, the first oil groove and the second oil groove are symmetrically distributed along the circumferential direction, the first oil groove is communicated with the third oil path and the port P, and the second oil groove is communicated with the fourth oil path and the port T.

Preferably, the piston rod is axially divided into a small end and a large end, the large end is in sliding fit in the main piston and divides an inner hole of the main piston into a first control cavity and a second control cavity, and the sectional area of the first control cavity is smaller than that of the second control cavity; the large end of the piston rod is also provided with a spiral groove, the main piston is provided with a convex column extending into the spiral groove, and when the piston rod moves axially relative to the main piston, the convex column and the spiral groove are matched to drive the piston rod to rotate along the circumferential direction.

Preferably, the piston rod is provided with a first auxiliary oil path, a communicating groove and a fourth auxiliary oil path, and the guide rod is provided with a second auxiliary oil path, a third auxiliary oil path and a first auxiliary oil hole; one end of the second auxiliary oil way is communicated with the port P, the other end of the second auxiliary oil way is communicated with one end of the first auxiliary oil way, and the other end of the first auxiliary oil way is communicated with the first control cavity; one end of the fourth auxiliary oil way is communicated with the second control cavity, and the other end of the fourth auxiliary oil way is communicated with the communication groove; one end of the first auxiliary oil hole is communicated with the second auxiliary oil way, and the other end of the first auxiliary oil hole is selectively communicated with the communicating groove; one end of the third auxiliary oil way is communicated with the T port, and the other end of the third auxiliary oil way is selectively communicated with the communicating groove;

when the main piston moves to the terminal position of the first control chamber, the other end of the first auxiliary oil hole is communicated with the communicating groove, so that the P port is communicated with the second control cavity; when the main piston moves to the terminal position of the second control chamber, the other end of the third auxiliary oil path is communicated with the communicating groove, so that the T port is communicated with the second control chamber.

Preferably, a fifth auxiliary oil path is further arranged on the main piston, one end of the fifth auxiliary oil path is communicated with the first control chamber, the other end of the fifth auxiliary oil path is communicated with the second control chamber, and a damping hole is formed in the fifth auxiliary oil path.

Further preferably, the hydraulic grouting pump is also provided with a rotation stopping rod; the rotation stopping rod penetrates through the main piston along the axial direction and then is fixed in the shell.

Preferably, a second working chamber which is independent from the control chamber and the first working chamber is further arranged in the shell, and a second liquid inlet hole and a second liquid outlet hole which are communicated with the second working chamber are further formed in the shell; the left end of the piston rod is located in the second working chamber.

Preferably, the shell adopts a split structure, a partition plate is arranged in the shell, and the interior of the shell is divided into a control chamber, a first working chamber and a second working chamber which are distributed along the axial direction.

Compared with the grouting pump with the existing structure, the grouting pump has the following beneficial technical effects:

1. in the invention, the shell is respectively provided with a P port connected with the hydraulic pump and a T port connected with the oil return tank, and the P port and the T port are alternately communicated with the control chambers at two sides of the main piston, so that the main piston is driven to axially reciprocate by means of hydraulic pressure, and the left end and the right end of the piston rod are driven to respectively perform repeated liquid suction and liquid discharge work in the first working chamber and the second working chamber. Meanwhile, the piston rod moving to the terminal position of the control chamber is axially moved relative to the main piston by the aid of high-pressure oil at the position of the P port, and the piston rod rotates relative to the main piston to switch the hydraulic acting force alternately applied to the two sides of the main piston by the high-pressure oil, so that the main piston is driven to axially reciprocate and alternately move. Therefore, the liquid suction and discharge are alternately realized by using the hydraulic pressure as power to drive the left end and the right end of the piston rod, the structure is simplified, and the compactness of the volume is improved.

2. In the invention, a plurality of oil ways and a plurality of annular grooves which are mutually associated are respectively arranged on the main piston and the piston rod, so that the switching of the alternative communication of the P port and the T port with the control chambers at the two sides of the main piston is completed in the relative movement process between the piston rod and the main piston. Furthermore, the shell and the piston rod are respectively provided with the auxiliary oil way and the communicating groove which are mutually associated, so that the piston rod is driven to axially move relative to the main piston by high-pressure oil at the position of the P port, and the rotation of the piston rod is realized. Like this, not only saved the use and the control requirement to the change valve in current hydraulic drive's grouting pump, reduced cost and control complexity, through set up a plurality of different functional structure respectively on casing, piston rod and main piston moreover to improved the rate of utilization to spare part, reduced the volume of whole grouting pump, reduced spare part use amount, realized the high integration of whole grouting pump.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic grouting pump according to the embodiment when a main piston moves to a terminal end in a direction of a second control chamber;

fig. 2 is a schematic structural diagram of the hydraulic grouting pump according to the embodiment after the main piston is located at the terminal of the second control chamber and the piston rod moves away from the first working chamber relative to the main piston;

fig. 3 is a schematic structural diagram of the hydraulic grouting pump according to the embodiment when the main piston moves to the terminal end in the direction of the first control chamber;

fig. 4 is a schematic structural diagram of the hydraulic grouting pump according to the embodiment after the main piston is located at the end of the first control chamber and the piston rod moves towards the direction close to the first working chamber relative to the main piston;

FIG. 5 is a schematic cross-sectional view taken along the line A-A in FIG. 2;

fig. 6 is a schematic three-dimensional structure diagram of the piston rod in the present embodiment.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the hydraulic grouting pump of the present embodiment includes a housing 1, a main piston 2, a sub-piston 4, and a piston rod 5. The secondary piston 4 is fixedly connected to the piston rod 5 and moves synchronously.

The shell 1 is a hollow structure, a control chamber, a first working chamber 113 and a second working chamber 114 which are mutually independent are arranged in the shell 1, the first working chamber 113 and the second working chamber 114 are positioned on the same side of the control chamber and are separated by an auxiliary piston 4, and a port P, a port T, a first liquid inlet hole 13, a first liquid outlet hole 14, a second liquid inlet hole 15 and a second liquid outlet hole 16 are arranged on the shell 1. Corresponding liquid passing one-way valves are respectively arranged in the first liquid inlet hole 13, the first liquid outlet hole 14, the second liquid inlet hole 15 and the second liquid outlet hole 16, so that corresponding one-way liquid inlet and one-way liquid discharging functions of all the holes are realized. The housing 1 is provided with a guide rod 10 extending in the axial direction in the control chamber.

The master piston 2 is located in the control chamber and divides the control chamber into a first control chamber 111 and a second control chamber 112, which are independent of each other. Wherein the P port and the T port are alternately communicated with the first control chamber 111 and the second control chamber 112, respectively. When the port P communicates with the first control chamber 111, the port T communicates with the second control chamber 112, and the high-pressure oil enters the first control chamber 111 to drive the main piston 2 to move axially in the direction of the second control chamber 112. When the port P communicates with the second control chamber 112, the port T communicates with the first control chamber 111, and the high-pressure oil enters the second control chamber 112 to drive the main piston 2 to move axially in the direction of the first control chamber 111.

The piston rod 5 is sleeved on the guide rod 10, one end of the piston rod 10 is in sliding fit in the main piston 2, and the other end of the piston rod penetrates out of the main piston 2 and then is fixedly connected with the auxiliary piston 4. The main piston 2 can drive the piston rod 5 to move axially and synchronously, and the piston rod 5 can also slide axially relative to the main piston 2 and rotate in the circumferential direction relative to the main piston 2 in the relative axial movement process. When the main piston 2 is driven by high-pressure oil introduced from the port P, the carrying piston rod 5 axially moves to the end position of the first control chamber 111 or the second control chamber 112, the piston rod 5 continues to axially move relative to the main piston 2 and rotates relative to the main piston in the circumferential direction to complete the switching of the communication relationship between the port P and the port T and the first control chamber 111 and the second control chamber 112, so that the main piston 2 is driven by the high-pressure oil introduced from the port P again after switching, and the carrying piston rod 5 axially moves in the opposite direction.

Referring to fig. 1, in the present embodiment, the piston rod 5 is designed in a stepped shaft structure form, and is axially divided into a small end and a large end, the large end is slidably fitted in the main piston 2 and divides the inner bore of the main piston 2 into a first control chamber 2a and a second control chamber 2b, the sectional area of the first control chamber 2a is smaller than that of the second control chamber 2b, and meanwhile, two positioning plugs 6 are respectively disposed at two ends of the main piston 2. The stage on the piston rod 3 comes into sliding contact with the main piston 2 and the axial distance between the two positioning plugs 6 is greater than the axial length of the large end on the piston rod 5. Therefore, the main piston 2 can carry the piston rod 5 to axially move together by virtue of the axial positioning of the positioning screw plugs 6 on the step sections of the piston rod 5, and the axial movement of the piston rod 5 relative to the main piston 2 can be realized by virtue of the axial distance between the two positioning screw plugs 6 and the axial size difference of the stage.

Referring to fig. 1 and 5, in the present embodiment, the main piston 2 is provided with a first oil path 21, a second oil path 22, a third oil path 23, and a fourth oil path 24, the piston rod 5 is provided with a first through flow groove and a second through flow groove 52 51, 52 are axially formed in the piston rod 5, the piston rod 5 is further provided with a spiral groove 57, the main piston 2 is provided with a convex pillar 20 extending into the spiral groove 59, and when the piston rod 5 axially moves relative to the main piston 2, the piston rod 5 is driven to rotate in the circumferential direction by the cooperation of the convex pillar 20 and the spiral groove 57.

One end of the first oil passage 21 is communicated with the first control chamber 111; one end of the second oil passage 22 is in communication with the second control chamber 112; one end of the third oil passage 23 is communicated with the port P, and the other end is selectively communicated with the first through-flow groove 51 and the second through-flow groove 52; one end of the fourth oil passage 24 is in communication with the T port, and the other end is selectively in communication with the first communicating groove 51 and the second communicating groove 52.

As shown in fig. 2, when the piston rod 5 moves in the direction of the first control chamber 111 with the master piston 2, the first oil passage 21 is communicated with the fourth oil passage 24 through the first through-flow groove 51, and the second oil passage 22 is communicated with the third oil passage 23 through the second through-flow groove 52. As shown in fig. 1, when the piston rod 5 moves in the direction of the second control chamber 112 with the master piston 2, the first oil passage 21 is communicated with the third oil passage 23 through the first flow passage 51, and the second oil passage 22 is communicated with the fourth oil passage 24 through the second flow passage 52.

As shown in fig. 1, when the piston rod 5 moves in the direction of the first control chamber 111 relative to the master piston 2, the first oil passage 21 is switched to be communicated with the third oil passage 23 through the first flow passage 51, and the second oil passage 22 is switched to be communicated with the fourth oil passage 24 through the second flow passage 52. As shown in fig. 2, when the piston rod 5 moves in the direction of the second control chamber 112 with respect to the master piston 2, the second oil passage 22 is switched to communicate with the third oil passage 23 through the second flow passage 52, and the first oil passage 21 is switched to communicate with the fourth oil passage 24 through the first flow passage 51.

Preferably, as shown in fig. 1, the outer surface of the main piston 2 is provided with a first oil groove 25 and a second oil groove 26 which are axially opened, and the first oil groove 25 and the second oil groove 26 are symmetrically distributed along the circumferential direction, the first oil groove 25 is communicated with the third oil path 23 and the port P, and the second oil groove 26 is communicated with the fourth oil path 24 and the port T.

Referring to fig. 1, in the present embodiment, the piston rod 5 is provided with a first auxiliary oil passage 53, a communication groove 54, and a fourth auxiliary oil passage 55, and the guide rod 10 is provided with a second auxiliary oil passage 11, a third auxiliary oil passage 12, and a first auxiliary oil hole 71. One end of the second auxiliary oil path 11 is communicated with the port P, the other end is communicated with one end of the first auxiliary oil path 53, and the other end of the first auxiliary oil path 53 is communicated with the first control chamber 2 a; one end of the fourth auxiliary oil passage 55 is held in communication with the second control chamber 2b, and the other end of the fourth auxiliary oil passage 55 is held in communication with the communication groove 54; one end of the first auxiliary oil hole 71 is communicated with the second auxiliary oil path 11, and the other end is selectively communicated with the communicating groove 54; one end of the third auxiliary oil passage 12 is in communication with the T port, and the other end is selectively in communication with the communication groove 54.

When the master piston 2 moves to the end position of the first control chamber 111, the other end of the first auxiliary oil hole 71 communicates with the communication groove 54, and the port P communicates with the second control chamber 2 b. When the master piston 2 moves to the end position of the second control chamber 112, the other end of the third auxiliary oil passage 12 communicates with the communication groove 54, and the T port communicates with the second control chamber 2 b.

Preferably, in the present embodiment, the master piston 2 is further provided with a fifth auxiliary oil passage 56, one end of the fifth auxiliary oil passage 56 is communicated with the first control chamber 111, the other end is communicated with the second control chamber 2b, and the fifth auxiliary oil passage 56 is provided with a damping hole 561.

In this embodiment, as shown in fig. 3, the grouting pump is further provided with a rotation stopping rod 9; the rotation stopping rod 9 penetrates through the main piston 3 along the axial direction and then is fixed in the shell 1, the rotation stopping rod 9 can prevent the main piston 2 from rotating, and therefore when the piston rod 5 moves relative to the main piston 2 along the axial direction, the piston rod 5 is driven to rotate relative to the main piston 2 along the circumferential direction.

In addition, referring to fig. 1, in the present embodiment, the housing 1 is designed in a split structure, and a partition plate 3 is disposed inside the housing 1, and the partition plate 3 separates the control chamber from the first working chamber and the second working chamber. Therefore, the whole shell is convenient to process and manufacture, particularly relevant oil ways, so that the processing difficulty and cost are reduced, the disassembly is convenient, and the assembly efficiency and the maintenance convenience are improved.

Referring to fig. 1 to 6, when the grouting pump of this embodiment is operated, the P port is connected to the hydraulic pump, and the T port is connected to the oil return tank, specifically, the operation process is as follows:

when the main piston 2 moves towards the second control chamber 112, the convex column 20 is located at the rightmost end position of the spiral groove 57, and the positioning plug 6 on the left side of the main piston 2 is in contact with the left side of the large end of the piston rod, so that the main piston 2 drives the piston rod 5 to move towards the second control chamber 112 together. At this time, the high-pressure oil output from the hydraulic pump flows to the first control chamber 111 through the port P, the first oil groove 25, the third oil passage 23, the first flow groove 51, and the first oil passage 21 in this order, and the oil in the second control chamber 112 flows to the oil return tank through the second oil passage 22, the second flow groove 52, the second oil groove 22, and the port T in this order. In this way, the main piston 2 moves towards the second control chamber 112 under the action of the high-pressure oil in the first control chamber 111, and simultaneously drives the right end of the secondary piston 4 to compress and apply work to the slurry in the second working chamber 114 and output the slurry through the second liquid outlet 16, and simultaneously drives the left end of the piston rod 5 to perform liquid suction operation in the first working chamber 113 and introduce the slurry through the first liquid inlet 13. At this time, since the second control chamber 2b communicates with the first control chamber 111 through the orifice 561, the pressure of the second control chamber 2b acts on the piston rod 5 to hold the piston rod 5 at the left end position of the main piston 2.

When the master piston 2 moves to the end position with the second control chamber 112, the other end of the third auxiliary oil passage 12 communicates with the communication groove 54, causing the T port to communicate with the second control chamber 2 b. At this time, the high-pressure oil at the port P enters the first control chamber 2a through the second auxiliary oil passage 11 and the first auxiliary oil passage 53 and acts on the piston rod 5, so as to push the piston rod 5 to move in the direction of the second control chamber 112 relative to the main piston 2, and the oil in the second control chamber 2b returns to the port T through the fourth auxiliary oil passage 55, the communication groove 54 and the third auxiliary oil passage 13. When the piston rod 5 moves relative to the main piston 2 in the direction of the second control chamber 112, due to the matching of the convex column 20 and the spiral groove 59 and the fact that the main piston 2 cannot rotate, the piston rod 5 rotates relative to the main piston 2 in the circumferential direction, the port P is switched to be communicated with the second control chamber 112, and the port T is switched to be communicated with the first control chamber 111, and the reversing operation of the main piston 2 is completed.

When the main piston 2 moves towards the first control chamber 111, the positioning plug 6 on the right side of the main piston 2 contacts with the right side of the large end of the piston rod 5, so that the main piston 2 drives the piston rod 5 to move towards the first control chamber 111 together. At this time, the high-pressure oil output from the hydraulic pump flows to the second control chamber 112 through the port P, the first oil groove 25, the third oil passage 23, the second flow passage 52, and the second oil passage 22 in sequence, and the oil in the first control chamber 111 flows to the oil return tank through the first oil passage 21, the first communication groove 51, the fourth oil passage 24, the second oil groove 26, and the port T in sequence. Thus, the main piston 2 moves towards the first working chamber 12 under the action of the high-pressure oil in the second control chamber 112, and simultaneously drives the left end of the auxiliary piston 4 to perform compression work and output slurry through the first liquid outlet hole 15, and simultaneously drives the right end of the auxiliary piston 4 to perform liquid suction operation and introduce slurry through the second liquid inlet hole 15. At this time, since the second control chamber 2b is communicated with the first control chamber 111 (at a low pressure) through the orifice 561, the pressure of the first control chamber 2a acts on the piston rod 5 to keep the piston rod 5 at the right end position of the main piston 2.

When the master piston 2 moves to the end position with the first control chamber 111, the other end of the first auxiliary oil hole 71 communicates with the communication groove 54, causing the port P to communicate with the second control chamber 2 b. At this time, the high-pressure oil at the port P enters the second control chamber 2b through the second auxiliary oil passage 11, the first auxiliary oil hole 71, the communication groove 54, and the fourth auxiliary oil passage 55 to act on the piston rod 5, and the sectional area of the second control chamber 2b is larger than that of the first control chamber 2a, so that the piston rod 5 is pushed to move in the direction of the first control chamber 111 relative to the main piston 2. When the piston rod 5 moves relative to the main piston 2 in the direction of the first control chamber 111, due to the cooperation of the convex column 20 and the spiral groove 59 and the incapability of rotating the main piston 2, the piston rod 5 rotates relative to the main piston 2 in the circumferential direction, the port P is switched to be communicated with the first control chamber 111, and the port T is switched to be communicated with the second control chamber 112, so that the reversing operation of the main piston 2 is completed.

And repeating the reciprocating action in sequence to complete the work of reciprocating liquid suction and liquid discharge of the grouting pump under the hydraulic drive.

Claims

1. The hydraulic grouting pump is characterized by comprising a shell, a main piston, an auxiliary piston and a piston rod; the auxiliary piston is fixedly connected with the piston rod and moves synchronously;

2. The hydraulic grouting pump according to claim 1, wherein the main piston is provided with a first oil path, a second oil path, a third oil path and a fourth oil path, and the piston rod is provided with a first through flow groove and a second through flow groove which are formed along the axial direction;

3. The hydraulic grouting pump according to claim 2, wherein the outer surface of the main piston is provided with a first oil groove and a second oil groove which are axially opened, the first oil groove and the second oil groove are symmetrically distributed along the circumferential direction, the first oil groove is communicated with the third oil passage and the P port, and the second oil groove is communicated with the fourth oil passage and the T port.

4. The hydraulic grouting pump of claim 1, wherein the piston rod is axially divided into a small end and a large end, the large end is slidably fitted in the main piston and divides the main piston bore into a first control chamber and a second control chamber, and the sectional area of the first control chamber is smaller than that of the second control chamber; the large end of the piston rod is also provided with a spiral groove, the main piston is provided with a convex column extending into the spiral groove, and when the piston rod moves axially relative to the main piston, the convex column and the spiral groove are matched to drive the piston rod to rotate along the circumferential direction.

5. The hydraulic grouting pump according to claim 4, wherein a first auxiliary oil path, a fourth auxiliary oil path and a communicating groove are formed in the piston rod, and a second auxiliary oil path, a third auxiliary oil path and a first auxiliary oil hole are formed in the guide rod; one end of the second auxiliary oil way is communicated with the port P, the other end of the second auxiliary oil way is communicated with one end of the first auxiliary oil way, and the other end of the first auxiliary oil way is communicated with the first control cavity; one end of the fourth auxiliary oil way is communicated with the second control cavity, and the other end of the fourth auxiliary oil way is communicated with the communication groove; one end of the first auxiliary oil hole is communicated with the second auxiliary oil way, and the other end of the first auxiliary oil hole is selectively communicated with the communicating groove; one end of the third auxiliary oil way is communicated with the T port, and the other end of the third auxiliary oil way is selectively communicated with the communicating groove;

6. The hydraulic grouting pump according to claim 5, wherein a fifth auxiliary oil passage is further provided in the main piston, one end of the fifth auxiliary oil passage is in communication with the first control chamber, the other end of the fifth auxiliary oil passage is in communication with the second control chamber, and a damping hole is provided in the fifth auxiliary oil passage.

7. The hydraulic grouting pump according to claim 1, characterized in that the hydraulic grouting pump is further provided with a rotation stopping rod; the rotation stopping rod penetrates through the main piston along the axial direction and then is fixed in the shell.

8. The hydraulic grouting pump according to claim 1, wherein a second working chamber independent from the control chamber and the first working chamber is further provided inside the casing, and a second liquid inlet hole and a second liquid outlet hole communicated with the second working chamber are further provided on the casing; the left end of the piston rod is located in the second working chamber.

9. The hydraulic grouting pump according to claim 7, wherein the casing is of a split structure, and a partition is provided inside the casing to divide the inside of the casing into a control chamber, a first working chamber and a second working chamber which are axially distributed.