A push-pull mechanism back-off stop control system for a horizontal directional drilling rig

Abstract

The invention discloses a push-pull mechanism retreat stop control system for a horizontal directional drilling rig, which relates to the manufacturing field of horizontal directional drilling rigs and comprises an oil tank, a first and a second hydraulic pump, a hydraulically controlled multi-way valve, a first and a second hydraulic motor, a hydraulically controlled handle, a manual overflow valve, a normally open two-position two-way solenoid valve, and a limit switch. The first hydraulic pump is connected to the hydraulically controlled multi-way valve, which is respectively connected to the first and the second hydraulic motors, and the second hydraulic pump is connected to the hydraulically controlled handle. The hydraulically controlled handle is connected to both ends of the hydraulically controlled multi-way valve through a forward pilot oil circuit and a backward pilot oil circuit, and the normally open two-position two-way solenoid valve is connected in a backward pilot oil circuit between the hydraulically controlled handle and the hydraulically controlled multi-way valve. The limit switch is arranged at the rear of the push-pull mechanism, and the limit switch is respectively connected to a power source and the normally open two-position two-way solenoid valve through a conductive line. When the push-pull mechanism retreats to the rear of the push-pull mechanism and hits the limit switch, the limit switch is closed to energize the normally open two-position two-way solenoid valve, and the backward pilot oil circuit is disconnected, and the backward action stops.

Description

Technical Field

[0001] The invention relates to the field of horizontal directional drilling machine manufacturing, in particular to a push-pull mechanism retreat stop control system of the horizontal directional drilling machine. Background Art

[0002] Horizontal directional drilling rig is a kind of engineering machinery used for laying various underground public facilities without excavating the ground surface. It is widely used in the laying of underground pipelines and pipelines in the fields of water supply, electricity, communications, natural gas, oil, etc. It is suitable for various complex strata such as sand, clay, pebbles, and rocks.

[0003] The push-pull mechanism of the horizontal directional drilling rig is driven by a hydraulic motor to drive the gear on the rack to move forward and backward. After a drill rod is drilled, it needs to retreat to the tail of the main arm, replace another drill rod, and continue drilling, repeating the cycle to ensure the smooth progress of the construction.

[0004] See also Figure 1 , which shows a push-pull mechanism control system of a horizontal directional drilling rig in the prior art, including an oil tank 101, a first hydraulic pump 102, a hydraulically controlled multi-way valve 103, a first hydraulic motor 104, a second hydraulic motor 105, a second hydraulic pump 106, a hydraulically controlled handle 107, and a manual relief valve 108. The working principle of the push-pull mechanism control system of the horizontal directional drilling rig is as follows: the first hydraulic pump 102 sucks oil from the oil tank 101, and supplies oil to the first hydraulic motor 104 and the second hydraulic motor 105 through the hydraulically controlled multi-way valve 103, thereby driving the first hydraulic motor 104 and the second hydraulic motor 105 to move forward and backward. The second hydraulic pump 106 sucks oil from the oil tank 101, and supplies pilot oil to the hydraulically controlled multi-way valve 103 through the hydraulically controlled handle 107, and the pressure of the pilot oil circuit is controlled by adjusting the manual relief valve 108.

[0005] The operating table is usually located in the front. The operator can observe whether the forward movement of the push-pull mechanism is in place, but the backward movement is difficult to judge. If it is not in place, the drill rod cannot be replaced. If it is retreated too much, it will collide with the mechanical limit mechanism and cause mechanical damage. In more serious cases, it will cause the gear to disengage from the rack, and the entire propulsion mechanism will disengage, causing unnecessary economic losses, thus affecting the work effect.

[0006] In summary, it is necessary to design a new horizontal directional drilling rig push-pull mechanism retreat stop control system to improve the normal retreat action of the horizontal directional drilling rig and ensure the safe and effective working efficiency of the horizontal directional drilling rig. Summary of the invention

[0007] The purpose of the present invention is to provide a push-pull mechanism retreat stop control system for a horizontal directional drilling rig in view of the defects of the above-mentioned prior art. The control system has a simple structure and low cost, and can make the push-pull mechanism retreat stop position accurate, thereby ensuring the normal retreat action of the horizontal directional drilling rig and the safe and effective working efficiency of the horizontal directional drilling rig.

[0008] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a push-pull mechanism retreat stop control system of a horizontal directional drilling rig, including an oil tank, a first hydraulic pump, a second hydraulic pump, a hydraulically controlled multi-way valve, a first hydraulic motor, a second hydraulic motor, a hydraulically controlled handle, and a manual overflow valve. The first hydraulic pump is connected to an oil inlet of the hydraulically controlled multi-way valve through an oil pipe, and an oil outlet of the hydraulically controlled multi-way valve is respectively connected to the oil inlets of the first hydraulic motor and the second hydraulic motor through an oil pipe. The oil outlets of the first hydraulic motor and the second hydraulic motor are connected to another oil inlet of the hydraulically controlled multi-way valve through an oil pipe. The second hydraulic pump is connected to the hydraulically controlled handle through an oil pipe, and the hydraulically controlled handle is respectively connected to the forward pilot oil circuit through an oil pipe. The rearward pilot oil circuit is connected with both ends of the hydraulically controlled multi-way valve, so that the second hydraulic pump can provide pilot oil to both ends of the hydraulically controlled multi-way valve respectively. The manual overflow valve is connected in parallel on one side of the hydraulically controlled handle and the oil outlet of the manual overflow valve is also connected to the oil tank. It also includes a normally open two-position two-way solenoid valve and a limit switch. The normally open two-position two-way solenoid valve is connected in the rearward pilot oil circuit between the hydraulically controlled handle and the hydraulically controlled multi-way valve. The limit switch is arranged at the tail of the push-pull mechanism. The limit switch is respectively connected to the power supply and the normally open two-position two-way solenoid valve through conductive wires. When the push-pull mechanism retreats to the tail of the push-pull mechanism and hits the limit switch, the limit switch is closed to energize the normally open two-position two-way solenoid valve, and the rearward pilot oil circuit is disconnected, and the rearward action stops.

[0009] Technical effect of the present invention: Compared with the push-pull mechanism control system of the horizontal directional drilling rig in the prior art, the present invention adds a normally open two-position two-way solenoid valve and a limit switch in the hydraulic circuit. Compared with other backward stop control methods, it is simpler and does not require changing too many components. It has a simple structure and low cost. The backward stop position of the push-pull mechanism is accurate, which can not only ensure the normal backward movement of the horizontal directional drilling rig, but also ensure the safe and effective working efficiency of the horizontal directional drilling rig.

[0010] The push-pull mechanism retreat stop control system of the horizontal directional drilling rig of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a hydraulic principle diagram of the push-pull mechanism control system of the prior art horizontal directional drilling rig;

[0012] Figure 2 It is a hydraulic principle diagram of a push-pull mechanism retreat stop control system of a horizontal directional drilling rig of the present invention;

[0013] Explanation of the accompanying drawings: 101-oil tank, 102-first hydraulic pump, 103-hydraulic controlled multi-way valve, 104-first hydraulic motor, 105-second hydraulic motor, 106-second hydraulic pump, 107-hydraulic controlled handle, 108-manual overflow valve, 109-normally open two-position two-way solenoid valve, 110-limit switch, 1-forward pilot oil circuit, 2-reverse pilot oil circuit. DETAILED DESCRIPTION

[0014] like Figure 2 As shown, the push-pull mechanism retreat stop control system of the horizontal directional drilling rig of the present invention includes an oil tank 101, a first hydraulic pump 102, a second hydraulic pump 106, a hydraulically controlled multi-way valve 103, a first hydraulic motor 104, a second hydraulic motor 105, a hydraulically controlled handle 107, a manual overflow valve 108, a normally open two-position two-way solenoid valve 109 and a limit switch 110.

[0015] The oil inlet of the first hydraulic pump 102 is connected to the oil tank 101 through an oil pipe, and the oil outlet of the first hydraulic pump 102 is connected to an oil inlet of the hydraulic multi-way valve 103 through an oil pipe. An oil outlet of the hydraulic multi-way valve 103 is connected to the oil inlets of the first hydraulic motor 104 and the second hydraulic motor 105 through oil pipes, respectively. The oil outlets of the first hydraulic motor 104 and the second hydraulic motor 105 are connected to another oil inlet of the hydraulic multi-way valve 103 through oil pipes, and the overflow valve of the hydraulic multi-way valve 103 is connected to the oil tank 101 through an oil pipe.

[0016] The second hydraulic pump 106 is connected to the hydraulic control handle 107 through an oil pipe, and the hydraulic control handle 107 is connected to both ends of the hydraulic control multi-way valve 103 through the forward pilot oil circuit 1 and the reverse pilot oil circuit 2 respectively, so that the second hydraulic pump 106 can provide pilot oil to both ends of the hydraulic control multi-way valve 103 respectively, and the manual overflow valve 108 is connected in parallel to one side of the hydraulic control handle 107 and the oil outlet of the manual overflow valve 108 is also connected to the oil tank 101, and the pressure of the pilot oil circuit is controlled by adjusting the manual overflow valve 108.

[0017] The normally open two-position two-way solenoid valve 109 is connected to the backward pilot oil circuit 2 between the hydraulic control handle 107 and the hydraulic control multi-way valve 103. The limit switch 110 is set at the tail of the push-pull mechanism. The limit switch 110 is connected to the power supply and the normally open two-position two-way solenoid valve 109 through conductive wires, and the other oil outlet of the normally open two-position two-way solenoid valve 109 is connected to the oil tank 101 through an oil pipe. When the push-pull mechanism retreats to the tail of the push-pull mechanism and hits the limit switch 110, the limit switch 110 is closed to energize the normally open two-position two-way solenoid valve 109, and the backward pilot oil circuit 2 is disconnected.

[0018] The working principle of the push-pull mechanism retreat stop control system of the horizontal directional drilling rig of the present invention is as follows: the first hydraulic pump 102 draws oil from the oil tank 101, and supplies oil to the first hydraulic motor 104 and the second hydraulic motor 105 through the hydraulic multi-way valve 103, thereby driving the first hydraulic motor 104 and the second hydraulic motor 105 to move forward and backward. The second hydraulic pump 106 draws oil from the oil tank 101, and supplies pilot oil to the hydraulic multi-way valve 103 through the hydraulic handle 107. The pressure of the pilot oil circuit is controlled by adjusting the manual relief valve 108; a normally open two-position two-way solenoid valve 109 is added to the hydraulic handle 107 retreat pilot oil circuit 2, and a limit switch 110 is added to the tail of the push-pull mechanism. When the push-pull mechanism retreats to the position of the limit switch 110, it hits the limit switch 110 to close the limit switch 110, and the limit switch 110 is closed. Energize the normally open two-position two-way solenoid valve 109, so that the normally open two-position two-way solenoid valve 109 changes from being on to being off, and the backward pilot oil is disconnected, and the backward action stops accordingly, then the entire push-pull mechanism stops retreating, and at this time only the forward action can be performed, and the forward movement of the push-pull mechanism no longer conflicts with the limit switch 110, and the limit switch 110 is automatically disconnected, and the normally open two-position two-way solenoid valve 109 automatically returns to its original state under the action of the spring, thereby realizing the control work of the backward process of the push-pull mechanism backward stop control system of the horizontal directional drilling rig.

[0019] The above embodiments are only preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a push-pull mechanism of a horizontal directional drilling rig to stop retreating, the method using a control system for the push-pull mechanism of the horizontal directional drilling rig to stop retreating, the control system comprising an oil tank (101), a first hydraulic pump (102), a second hydraulic pump (106), a hydraulically controlled multi-way valve (103), a first hydraulic motor (104), a second hydraulic motor (105), a hydraulically controlled handle (107), and a manual overflow valve (108); the first hydraulic pump (102) is connected to an oil inlet of the hydraulically controlled multi-way valve (103) through an oil pipe, and an oil outlet of the hydraulically controlled multi-way valve (103) is connected to the first hydraulic motor (104) and the second hydraulic motor (105) through an oil pipe. The oil inlet of the hydraulic control multi-way valve (103) is connected, the oil outlets of the first hydraulic motor (104) and the second hydraulic motor (105) are connected to another oil inlet of the hydraulic control multi-way valve (103) through oil pipes, the second hydraulic pump (106) is connected to the hydraulic control handle (107) through oil pipes, and the hydraulic control handle (107) is respectively connected to both ends of the hydraulic control multi-way valve (103) through a forward pilot oil circuit (1) and a reverse pilot oil circuit (2), so that the second hydraulic pump (106) can provide pilot oil to both ends of the hydraulic control multi-way valve (103), a manual overflow valve (108) is connected in parallel to one side of the hydraulic control handle (107), and the oil outlet of the manual overflow valve (108) is also connected to the oil tank (101), characterized in that: It also includes a normally open two-position two-way solenoid valve (109) and a limit switch (110). The normally open two-position two-way solenoid valve (109) is connected to the retreat pilot oil circuit (2) between the hydraulic control handle (107) and the hydraulic control multi-way valve (103). The limit switch (110) is arranged at the rear of the push-pull mechanism. The limit switch (110) is respectively connected to the power supply and the normally open two-position two-way solenoid valve (109) through conductive wires. When the push-pull mechanism retreats until the rear of the push-pull mechanism hits the limit switch (110), the limit switch (110) is closed so that the normally open two-position two-way solenoid valve (109) is energized and the retreat pilot oil circuit (2) is disconnected.

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