Electric control piston pump for synchronous double-liquid grouting

Abstract

The utility model discloses an electric control piston pump used for synchronous double-liquid grouting, which comprises a first conveying pipeline and a second conveying pipeline, the first conveying pipeline and the second conveying pipeline respectively comprise an inlet, a discharge port, a pumping pipe and a piston pipe, the inlet is arranged on one side of the pumping pipe, the discharge port is arranged on the other side of the pumping pipe, and the piston pipe is arranged on the first conveying pipeline and the second conveying pipeline. The pumping pipe is connected with a piston pipe, a piston structure is arranged at one end in the piston pipe, and the piston structure is connected with a driving device. An H-shaped adjusting pipeline is arranged between the pumping pipe and the discharge port of the first conveying pipeline and the second conveying pipeline, the H-shaped adjusting pipeline comprises a first discharging stop valve, a second discharging stop valve and a bypass valve, the first discharging stop valve is arranged on the first conveying pipeline, the second discharging stop valve is arranged on the second conveying pipeline, and the bypass valve is arranged on the second conveying pipeline. The bypass valve is arranged between the first conveying pipeline and the second conveying pipeline. The driving device is a hydraulic driving cylinder. The problem that an existing grouting device is poor in grouting effect is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to grouting equipment field especially, it relates to a kind of electric control piston pump and method for synchronous double liquid grouting. BACKGROUND

[0002] In the process of shield construction, because the diameter of the cutter head of the shield machine is greater than the outer diameter of the shield tunnel, there will be a gap between the tunnel and its surrounding stratum. To prevent the surrounding stratum of the shield tunnel from moving radially relative to the tunnel and causing surface subsidence, synchronous grouting is crucial during shield tunneling construction. During shield tunneling, the synchronous grouting system injects grout into the gap between the tunnel and the soil, effectively preventing local stress concentration in the segment structure due to unnecessary resistance, improving the overall impermeability of the tunnel, and better constraining the segment, providing protection and reinforcement for the segment lining.

[0003] For a long time, the grout used in the shield grouting system has been conventional single liquid, which mainly consists of cement, fly ash, bentonite, and sand. Its main feature is that the initial setting time is generally more than 6 hours, and the final setting time is more than 30 hours. Moreover, the synchronous grouting system injected into the back of the segment needs to be combined with the seepage water in the stratum, which further prolongs the setting time of the synchronous grout. This phenomenon seriously affects the forming effect of the grout and the support and reinforcement of the segment after the grout sets. In some water-rich strata, the prolonged setting time of the grout can even lead to the formation of a through channel between the segment and the soil, causing the flowing underground water to wash away the grout, and ultimately resulting in the segment floating, misalignment, and even rupture.

[0004] Grouting quality directly affects the quality of the segment and the service life of the tunnel, so the requirements for the quality of synchronous grouting during tunnel construction are becoming increasingly stringent. Currently, some urban subway tunnel projects have explicitly stated that the grouting system of the shield machine used in this project must be equipped with a synchronous double liquid grouting system. That is, a certain proportion of water glass is added to the original single liquid grouting to accelerate the setting time of the grout. According to different proportions, the initial setting time of the grout can be shortened from 6 hours to 30 seconds. In special strata, synchronous double liquid grouting can greatly solve a series of problems caused by the long setting time of the grout.

[0005] At present, the KSP series hydraulic control reversing single-stroke plunger type grouting pump is mostly used in the domestic shield grouting system, and the piston reversing is controlled by a set of sequence valve. The system controls the sequence valve to switch by the oil pressure generated after the oil cylinder reaches the limit position to realize the oil cylinder reversing. The system is relatively complex, and the characteristics of the hydraulic control system are that the reversing action is automatically reversed by the hydraulic control circuit, the grouting efficiency is high, the slurry pressure is large, the product quality is stable, etc. However, since the pump is a single-stroke plunger type, each oil cylinder independently controls a slurry pump, and the slurry pumping is performed only during the extension of the oil cylinder; when the oil cylinder retracts, the pumping function stops. The control principle directly reflects that the slurry pumping curve of the system is half-wave, and the overall slurry pumping process is discontinuous.

[0006] As described above, the synchronous double-liquid grouting must maintain a certain slurry configuration ratio to realize the controllable slurry setting time. However, due to the discontinuous pumping process of the existing KSP type grouting pump, the slurry ratio of the double-liquid slurry cannot be effectively controlled, and the slurry setting time is uncontrollable. In the extreme case, the frequent pipe blockage caused by abnormal ratio may directly affect the system operation and construction efficiency.

[0007] The utility model discloses a kind of electric control double-liquid grouting pumps capable of realizing continuous pumping function based on original KSP type grouting pump, and the problem that slurry ratio is uncontrollable caused by discontinuous mortar injection in double-liquid grouting system can be better solved. Utility model contents

[0008] The utility model aims at providing a kind of electric control piston pump for synchronous double-liquid grouting to solve the problem of poor grouting effect of existing grouting device.

[0009] The utility model discloses a kind of electric control piston pump for synchronous double-liquid grouting, including: first conveying pipeline and second conveying pipeline, the first conveying pipeline and second conveying pipeline all include entrance, discharge port, pumping pipe and piston pipe, the entrance is set to pumping pipe one side, the discharge port is set to pumping pipe other side, the pumping pipe is connected with piston pipe, the piston pipe is provided with piston structure, the piston structure is connected with driving device.

[0010] As further improvement of the above technical solution:

[0011] H type adjusting pipeline is provided between the pumping pipe and discharge port of the first conveying pipeline and the second conveying pipeline, the H type adjusting pipeline includes first discharge stop valve, second discharge stop valve and bypass valve, the first discharge stop valve is set on the first conveying pipeline, the second discharge stop valve is set on the second conveying pipeline, and the bypass valve is set between the first conveying pipeline and the second conveying pipeline.

[0012] The working sequences of the two driving devices are opposite.

[0013] The driving device is a hydraulic driving cylinder.

[0014] The hydraulic driving cylinder is connected with a hydraulic oil control unit, one side of the hydraulic driving cylinder is provided with an extension limit sensing device, and the other side is provided with a contraction limit sensing device.

[0015] The hydraulic driving cylinder is provided with an extension pre-limit sensing device near the extension limit sensing device.

[0016] The hydraulic driving cylinder is provided with a stroke sensor.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] Flexible grouting mode: by designing H-shaped adjusting pipeline at the outlet of the existing double-path grouting pump, cooperating with the switching of the first discharge stop valve, the second discharge stop valve and the bypass valve, various grouting modes can be realized. The flexibility and applicability of the grouting system are improved, and different engineering requirements can be met.

[0019] Automatic control system: the hydraulic oil control unit (electromagnetic reversing valve) is used to control the reversing of the hydraulic driving cylinder, the reversing oil circuit of the oil cylinder is directly controlled by the electromagnetic reversing valve, and the single-path hydraulic driving cylinder reversing is controllable through the automatic control system. This design simplifies the control system, improves the operation efficiency and reliability.

[0020] Accurate limit position sensing: the oil cylinder extension limit sensing device and the oil cylinder contraction limit sensing device are designed at the head and tail of each hydraulic driving cylinder, which can effectively feed the oil cylinder extension and contraction to the automatic control system. Limit signal as a control condition for the reversing of the oil cylinder hydraulic driving cylinder. This design ensures the accurate control of the oil cylinder movement and avoids the problems of overshoot or not reaching the position.

[0021] Alternating operation and continuous pumping: by controlling the start of the hydraulic oil control unit, the two hydraulic driving cylinders are alternately operated. The function of continuous grout pumping is realized, and the grouting efficiency is improved.

[0022] Reduce grouting fluctuation: the extension pre-limit sensing device is separately designed near the extension limit sensing device at the head of the hydraulic driving cylinder, which can effectively reduce the problem of large grouting fluctuation caused by unreasonable reversing overlap of the double oil cylinders, and improve the grouting quality.

[0023] Application of stroke sensor: the stroke sensor is installed in the hydraulic driving cylinder, and the position of the oil cylinder is determined by reading the stroke of the stroke sensor, to replace the functions of the oil cylinder limit position sensing device and the pre-limit position sensing device. This design further simplifies the system and improves the accuracy and reliability of position detection.

[0024] In summary, the electronically controlled piston pump of this embodiment, through a variety of innovative designs, achieves flexible grouting modes, automated control, precise limit position sensing, alternating operation and continuous pumping, reduced grouting fluctuations, and the application of stroke sensors, significantly improving the performance and reliability of the grouting system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0026] Reference numerals: 1. First conveying pipeline; 100. Inlet; 2. Second conveying pipeline; 200. Outlet; 3. Piston structure; 300. Pumping pipe; 4. Drive device; 400. Piston pipe; 41. Hydraulic oil control unit; 42. Extension limit sensing device; 43. Contraction limit sensing device; 44. Extension pre-limit sensing device; 45. Stroke sensor; 5. H-type regulating pipeline; 51. First discharge shut-off valve; 52. Second discharge shut-off valve; 53. Bypass valve. Detailed Implementation

[0027] To make the technical means, creative features, and achieved objectives and effects of this utility model readily understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1 As shown, the electrically controlled piston pump for synchronous dual-liquid grouting in this embodiment includes: a first delivery pipeline 1 and a second delivery pipeline 2. Both the first delivery pipeline 1 and the second delivery pipeline 2 include an inlet 100, an outlet 200, a pumping pipe 300, and a piston pipe 400. The inlet 100 is located on one side of the pumping pipe 300, and the outlet 200 is located on the other side of the pumping pipe 300. The pumping pipe 300 is connected to the piston pipe 400, and a piston structure 3 is provided inside the piston pipe 400. The piston structure 3 is connected to a driving device 4.

[0029] An H-type regulating pipeline 5 is provided between the pumping pipe 300 and the discharge port 200 of the first conveying pipeline 1 and the second conveying pipeline 2. The H-type regulating pipeline 5 includes a first discharge stop valve 51, a second discharge stop valve 52 and a bypass valve 53. The first discharge stop valve 51 is provided on the first conveying pipeline 1, the second discharge stop valve 52 is provided on the second conveying pipeline 2, and the bypass valve 53 is provided between the first conveying pipeline 1 and the second conveying pipeline 2.

[0030] The embodiment designs an H-shaped adjusting pipeline 5 at the outlet of the existing double-path grouting pump. Through switching of the first discharge stop valve 51, the second discharge stop valve 52 and the bypass valve 53, independent double-path grouting pump combination can be changed into a set of combined grouting device. The opening and closing combination of the three valves on the H-shaped adjusting pipeline 5 at the outlet of the pipeline can be realized to achieve single injection of the first conveying pipeline 1 and the second conveying pipeline 2 of the grouting pump, respectively, and double-path piston simultaneous injection of only the first conveying pipeline 1 or the second conveying pipeline 2. When the first discharge stop valve 51 and the second discharge stop valve 52 are opened and the bypass valve 53 is closed, the grouting pump is in the conventional double-path grouting mode. When the bypass valve 53 is opened and one of the first conveying pipeline 1 and the second conveying pipeline 2 is closed, the valve opened in this path can realize double-path piston simultaneous grouting to any one of the discharge outlets 200.

[0031] The embodiment designs an electric control grouting pump reversing control system for controlling the reversing of the hydraulic drive cylinder through the hydraulic oil control unit 41 (electromagnetic reversing valve). The characteristic is that the cylinder reversing oil circuit is directly controlled by the electromagnetic reversing valve, and the single-path hydraulic drive cylinder reversing can be controlled through the automatic control system.

[0032] The embodiment designs the oil cylinder extension limit sensing device 42 and the oil cylinder contraction limit sensing device 43 at the extreme positions of the head and tail of each path of the hydraulic drive cylinder, which can effectively feed the oil cylinder extension and contraction to the limit signal to the automatic control system as the control condition of the oil cylinder hydraulic drive cylinder reversing.

[0033] The embodiment realizes the alternate operation of the two hydraulic drive cylinders by controlling the start of the hydraulic oil control unit 41. That is, when the A route piston structure 3 is pumping forward, the A route hydraulic drive cylinder is extended, and the B route hydraulic drive cylinder is retracted or in a stop state; when the A route hydraulic drive cylinder is extended to the limit position, the A route extension limit sensing device 42 sends a signal to the electronic control system to control the A route hydraulic oil control unit 41 to act, and the A route hydraulic drive cylinder is retracted; when the A route hydraulic drive cylinder is retracted to the limit position, the A route retraction limit sensing device 43 sends a signal to the electronic control system, and the A route hydraulic oil control unit 41 acts, at this time, the A route hydraulic drive cylinder is in an extended standby state; at the same time, when the electronic control system detects that the A route hydraulic drive cylinder starts to retract, the B route hydraulic oil control unit 41 is controlled to make the B route hydraulic drive cylinder start to extend, and the B route piston structure 3 pumps forward. When the B route hydraulic drive cylinder is extended to the limit position, the B route extension limit sensing device 42 sends a signal to the electronic control system, and the B route hydraulic oil control unit 41 acts, and the B route hydraulic drive cylinder is retracted; when the B route hydraulic drive cylinder is retracted to the limit position, the B route retraction limit sensing device 43 sends a signal to the electronic control system, and the B route hydraulic oil control unit 41 acts, at this time, the B route hydraulic drive cylinder is in an extended standby state; at this time, the A route hydraulic oil control unit 41 is controlled again to make the A route oil cylinder hydraulic drive cylinder start to extend, and the A route piston structure 3 starts to pump forward. The reciprocating operation can realize the alternate extension of the two oil cylinders to realize the function of continuous slurry pumping.

[0034] The embodiment separately designs a pre-extension limit sensing device 44 at the first end of the hydraulic drive cylinder close to the extension limit sensing device 42. The position of the pre-extension limit sensing device 44 can be fixed or adjustable in a small range in the axial direction of the hydraulic drive cylinder. When the pre-extension limit sensing device 44 respectively detects that the hydraulic drive cylinder is close to the extension limit position, the control system gives a start signal to the other hydraulic drive cylinder. For example: when the A route hydraulic drive cylinder is close to the extension limit position, the electronic control system gives a start signal to the B route hydraulic oil control unit 41 to control the B route hydraulic drive cylinder to start to extend; when the B route hydraulic drive cylinder is close to the extension limit position, the electronic control system gives a start signal to the A route hydraulic oil control unit 41 to control the A route hydraulic drive cylinder to start to extend. By adjusting the overlapping length of the stop of the A route hydraulic drive cylinder and the start of the B route hydraulic drive cylinder and the stop of the B route hydraulic drive cylinder and the start of the A route hydraulic drive cylinder, the A route hydraulic drive cylinder can basically reach the limit position and stop, the B route hydraulic drive cylinder has completed the acceleration stage of the initial start, and the B route piston structure 3 performs slurry injection at the predetermined speed. At the same time, when the B route hydraulic drive cylinder reaches the limit position and stops, the A route hydraulic drive cylinder has completed the acceleration stage of the initial start, and the A route piston structure 3 performs slurry injection at the predetermined speed. In this way, the A route piston structure 3 and the B route piston structure 3 are alternately and reciprocally operated. This design can effectively reduce the problem of large grouting fluctuation caused by unreasonable switching of the two oil cylinders.

[0035] In this embodiment, a stroke sensor 45 can be installed in the hydraulic drive cylinder. The cylinder position is determined by reading the stroke of the stroke sensor 45, instead of the functions of the cylinder limit position sensing device and the pre-limit position sensing device.

[0036] The above is only the embodiment of the present application, and the specific structure and characteristics disclosed in the scheme are not described in detail. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims.

Claims

1. An electrically controlled piston pump for synchronized dual liquid grouting, characterized in that, The utility model relates to a kind of double-piston pump, including: First conveying pipeline (1) and second conveying pipeline (2), the first conveying pipeline (1) and second conveying pipeline (2) each include inlet (100), discharge port (200), pumping pipe (300) and piston pipe (400), the inlet (100) is arranged on one side of pumping pipe (300), the discharge port (200) is arranged on the other side of pumping pipe (300), the pumping pipe (300) is connected with piston pipe (400), and piston structure (3) is arranged in the piston pipe (400), and the piston structure (3) is connected with driving device (4).

2. The electronically controlled piston pump for synchronous dual-liquid grouting according to claim 1, characterized in that, The pumping pipe (300) and discharge port (200) of the first conveying pipeline (1) and second conveying pipeline (2) are provided with H-shaped adjusting pipeline (5), the H-shaped adjusting pipeline (5) includes first discharge stop valve (51), second discharge stop valve (52) and bypass valve (53), the first discharge stop valve (51) is arranged on the first conveying pipeline (1), the second discharge stop valve (52) is arranged on the second conveying pipeline (2), and the bypass valve (53) is arranged between the first conveying pipeline (1) and the second conveying pipeline (2).

3. The electronically controlled piston pump for synchronized dual-liquid grouting according to claim 1, characterized in that, The working order of two driving devices (4) is opposite.

4. The electrically controlled piston pump for synchronous double liquid grouting according to any one of claims 1 to 3, characterized in that, The driving device (4) is hydraulic drive cylinder.

5. The electronically controlled piston pump for synchronous dual-liquid grouting according to claim 4, characterized in that, The hydraulic drive cylinder is connected with hydraulic oil control unit (41), one side of the hydraulic drive cylinder is provided with extension limit sensing device (42), and the other side is provided with shrink limit sensing device (43).

6. The electronically controlled piston pump for synchronous dual-liquid grouting according to claim 5, characterized in that, The hydraulic drive cylinder is provided with extension pre-limit sensing device (44) close to extension limit sensing device (42).

7. The electronically controlled piston pump for synchronous dual-liquid grouting according to claim 4, characterized in that, Stroke sensor (45) is arranged in the hydraulic drive cylinder.

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