An intermittent built-in pressure-increasing oil cylinder structure

Abstract

The present invention discloses an intermittent built-in booster oil cylinder structure, wherein a booster oil cylinder is arranged at the bottom of the telescopic oil cylinder, and one end of the booster oil cylinder away from the telescopic oil cylinder is fixedly connected to an oil cylinder support, and the telescopic oil cylinder and the booster oil cylinder are connected to each other through a booster oil port, and the telescopic oil cylinder is composed of a cylinder barrel, a piston and a piston rod, and a small cavity oil port is opened through one side of the top of the cylinder barrel, and the piston is arranged inside the cylinder barrel, and a piston rod is connected to one end of the top of the cylinder barrel. The hydraulic oil cylinder of the present invention is located at the bottom of the telescopic oil cylinder, and the booster oil chamber is directly connected to the large chamber of the telescopic oil cylinder, which reduces the installation space, omits the oil circuit of the booster oil, and controls the cost; under the condition that the maximum pressure of the hydraulic oil flowing into the high-pressure oil port of the main oil circuit remains unchanged, the booster function of the built-in booster oil cylinder is utilized to increase the thrust of the telescopic oil cylinder within a preset time, thereby improving the excavation force of the excavator.

Description

Technical Field

[0001] The invention relates to the technical field of telescopic hydraulic cylinders, in particular to an intermittent built-in pressure-increasing cylinder structure. Background Art

[0002] One of the important performance indicators of hydraulic excavators is digging force, which is directly proportional to digging efficiency. The greater the digging force, the faster the digging speed, and the higher the digging efficiency of the excavator.

[0003] Figure 4 This is an example of the digging range of a backhoe hydraulic excavator below the ground level. Within this digging range, the digging force of the hydraulic excavator at each point is different. The excavator designer will determine the digging force of the hydraulic excavator based on the resistance of the excavation object. However, in the actual excavation operation of the excavator, it is often encountered that the resistance of the excavation object suddenly increases, and the thrust of the hydraulic cylinder in the working device cannot overcome this resistance. At this time, the excavator operator can only adjust the excavation method to continue the excavation operation, and the excavation speed is reduced, which affects the excavation efficiency. For this reason, we propose an intermittent built-in pressure-increasing cylinder structure. Summary of the invention

[0004] The object of the present invention is to provide an intermittent built-in pressure-increasing cylinder structure to solve the problems solved in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intermittent built-in pressure-increasing oil cylinder structure, comprising a telescopic oil cylinder, a boosting oil cylinder and an excavator, wherein a boosting oil cylinder is arranged at the bottom of the telescopic oil cylinder, and one end of the boosting oil cylinder away from the telescopic oil cylinder is fixedly connected to an oil cylinder support, and the oil cylinder support is installed on the surface of the excavator, and one end of the excavator is provided with a bucket rod and a bucket, and the telescopic oil cylinder and the boosting oil cylinder are connected to each other through a boosting oil port, and the telescopic oil cylinder is composed of a cylinder barrel, a piston and a piston rod, and a small cavity oil port is opened through one side of the top of the cylinder barrel, and the piston is arranged inside the cylinder barrel, and a piston rod is connected to one end of the top of the cylinder barrel, and the piston rod is penetrated into the inside of the cylinder barrel and connected with the piston, and the inside of the cylinder barrel and one side of the piston and the piston rod are separated into a large cavity of the telescopic oil cylinder, and a large cavity oil port is opened at the top of the cylinder barrel and corresponding to the position of the large cavity of the telescopic oil cylinder, and the boosting oil cylinder is fixedly installed between the cylinder barrel and the oil cylinder support, and a reversing valve is arranged on the top of the boosting oil cylinder.

[0006] Preferably, the booster cylinder is composed of a booster cylinder body, a booster cylinder piston and a booster push rod, the booster cylinder body is provided with a booster cylinder piston and a booster push rod, the booster cylinder body is provided with a reversing valve, the interior of the booster cylinder body is divided into a booster oil chamber, a breathing oil chamber and a booster cylinder large chamber in left and right directions by the booster cylinder piston and the booster push rod, one end of the booster oil chamber is fixedly connected with the telescopic cylinder large chamber through a booster oil port, and a breathing oil chamber oil port and a booster cylinder large chamber oil port are provided at the top of the booster cylinder body and at positions corresponding to the breathing oil chamber and the booster cylinder large chamber, respectively.

[0007] Preferably, the cross-sectional area of ​​the boosting cylinder piston is larger than the cross-sectional area of ​​the boosting push rod, and the ratio of the cross-sectional areas of the boosting cylinder piston and the boosting push rod is the boosting ratio of the boosting cylinder.

[0008] Preferably, the large-cavity oil port of the telescopic oil cylinder, the breathing oil chamber oil port in the booster oil cylinder body, and the large-cavity oil port of the booster oil cylinder are all interconnected with the reversing valve outside the booster oil cylinder body.

[0009] Preferably, the reversing valve fixedly connected to the outside of the boost cylinder is set as a three-position five-way signal-controlled reversing valve, and the reversing valve consists of a reversing valve body, a reversing valve column, a first control signal interface and a second control signal interface. A reversing valve column is arranged inside the reversing valve body, and a high-pressure oil port and an oil return port are arranged on the top of the reversing valve body. The first control signal interface and the second control signal interface are fixedly installed at both ends of the reversing valve column, and one end of the first control signal interface and the second control signal interface are respectively connected to a preparatory signal and a boost signal, and the holding time of the boost signal connected to the second control signal interface is pre-set.

[0010] Preferably, the three positions of the reversing valve are the middle position, the standby position and the boosting position, and the connecting oil ports corresponding to the five-way portion of the reversing valve are the high-pressure oil port, the large-cavity oil port, the return oil port, the large-cavity oil port of the boosting cylinder and the breathing oil chamber oil port.

[0011] Compared with the prior art, the present invention has the following beneficial effects: the hydraulic cylinder of the present invention is located at the bottom of the telescopic cylinder, and the boosting oil chamber is directly connected to the large chamber of the telescopic cylinder, which reduces the installation space, omits the oil circuit of the boosting oil, and controls the cost; when the maximum pressure of the hydraulic oil flowing into the high-pressure oil port of the main oil circuit remains unchanged, the boosting function of the built-in boosting cylinder is utilized to increase the thrust of the telescopic cylinder within a preset time, thereby improving the digging force of the excavator. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a hydraulic system diagram of the telescopic cylinder of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of the telescopic cylinder of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the telescopic oil cylinder reversing valve of the present invention;

[0015] Figure 4 The present invention is an installation structure diagram of the telescopic cylinder applied to a backhoe hydraulic excavator and a diagram of the excavation range of the backhoe hydraulic excavator below the ground level.

[0016] In the figure: 1 telescopic cylinder, 2 booster cylinder, 3 cylinder support, 4 booster cylinder body, 5 reversing valve, 6 booster cylinder piston, 7 booster push rod, 8 reversing valve body, 9 reversing valve column, 10 first control signal interface, 11 second control signal interface, 12 cylinder barrel, 13 piston, 14 piston rod, 20 arm, 21 bucket, 22 excavator, A1 high-pressure oil port, A2 large cavity oil port, B1 small cavity oil port, C1 booster oil port, T0 return oil port, T1 booster cylinder large cavity oil port, T2 breathing oil cavity oil port, Q1 telescopic cylinder large cavity, Q2 booster cylinder large cavity, Q3 booster oil cavity, Q4 breathing oil cavity, p1 preparatory signal, p2 booster signal, F excavation resistance. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-4 The present invention provides a technical solution: an intermittent built-in pressure-increasing oil cylinder structure, comprising a telescopic oil cylinder 1, a pressure-increasing oil cylinder 2 and an excavator 22, wherein the pressure-increasing oil cylinder 2 is arranged at the bottom of the telescopic oil cylinder 1, and the end of the pressure-increasing oil cylinder 2 away from the telescopic oil cylinder 1 is fixedly connected to a cylinder support 3, and the cylinder support 3 is installed on the surface of the excavator 22, and one end of the excavator 22 is provided with a bucket rod 20 and a bucket 21, and the telescopic oil cylinder 1 and the pressure-increasing oil cylinder 2 are connected to each other through a pressure-increasing oil port C1, and the telescopic oil cylinder 1 is composed of a cylinder barrel 12, a piston 13 and a piston rod 14, and the cylinder barrel A small cavity oil port B1 is provided on one side of the top of the cylinder 12, the piston 13 is arranged inside the cylinder 12, a piston rod 14 is connected to one end of the top of the cylinder 12, the piston rod 14 penetrates into the inside of the cylinder 12 and is connected with the piston 13, the inside of the cylinder 12 and one side of the piston 13 and the piston rod 14 are separated into a large cavity Q1 of the telescopic cylinder, a large cavity oil port A2 is provided at the top of the cylinder 12 and at a position corresponding to the large cavity Q1 of the telescopic cylinder, the booster cylinder 2 is fixedly installed between the cylinder 12 and the cylinder support 3, and a reversing valve 5 is provided on the top of the booster cylinder 2.

[0019] Preferably, the booster cylinder 2 is composed of a booster cylinder body 4, a booster cylinder piston 6 and a booster push rod 7. The booster cylinder body 4 is provided with a booster cylinder piston 6 and a booster push rod 7. The booster cylinder body 4 is provided with a reversing valve 5. The interior of the booster cylinder body 4 is divided into a booster oil chamber Q3, a breathing oil chamber Q4 and a booster cylinder large chamber Q2 in left and right directions by the booster cylinder piston 6 and the booster push rod 7. One end of the booster oil chamber Q3 is fixedly connected to the telescopic cylinder large chamber Q1 through the booster oil port C1. The top of the booster cylinder body 4 and the positions corresponding to the breathing oil chamber Q4 and the booster cylinder large chamber Q2 are provided with a breathing oil chamber oil port T2 and a booster cylinder large chamber oil port T1.

[0020] Preferably, the cross-sectional area of ​​the boosting cylinder piston 6 is larger than the cross-sectional area of ​​the boosting push rod 7 , and the ratio of the cross-sectional areas of the boosting cylinder piston 6 and the boosting push rod 7 is the boosting ratio of the boosting cylinder 2 .

[0021] Preferably, the large chamber oil port A2 of the telescopic cylinder 1 , the breathing oil chamber oil port T2 in the booster cylinder body 4 , and the booster cylinder large chamber oil port T1 are all interconnected with the reversing valve 5 outside the booster cylinder body 4 .

[0022] Preferably, the reversing valve 5 fixedly connected to the outside of the boost cylinder 2 is set as a three-position five-way signal-controlled reversing valve, and the reversing valve 5 is composed of a reversing valve body 8, a reversing valve column 9, a first control signal interface 10 and a second control signal interface 11. The reversing valve column 9 is arranged inside the reversing valve body 8, and the top of the reversing valve body 8 is provided with a high-pressure oil port A1 and a return oil port T0. The two ends of the reversing valve column 9 are respectively fixedly installed with a first control signal interface 10 and a second control signal interface 11, and one end of the first control signal interface 10 and the second control signal interface 11 are respectively connected to the preparatory signal p1 and the boost signal p2, and the holding time of the boost signal p2 connected to the second control signal interface 11 is pre-set.

[0023] Preferably, the three positions of the reversing valve 5 are respectively the middle position, the standby position and the boosting position, and the connecting oil ports corresponding to the five-way portion of the reversing valve 5 are the high-pressure oil port A1, the large-cavity oil port A2, the return oil port T0, the boosting cylinder large-cavity oil port T1 and the breathing oil chamber oil port T2.

[0024] When used, the following steps will be performed, first;

[0025] (1) Figure 2A booster cylinder 2 is provided at the bottom of the telescopic cylinder 1. The booster cylinder 2 is fixedly connected between the cylinder barrel 12 of the telescopic cylinder and the cylinder support 3, and a reversing valve 5 is fixedly installed on the booster cylinder 2. A booster cylinder piston 6 and a booster push rod 7 are provided in the booster cylinder body 4. The oil port C1 of the booster oil chamber Q3 is directly connected to the large chamber Q1 of the telescopic cylinder. The cross-sectional area of ​​the booster cylinder piston 6 is larger than that of the booster push rod 7, and the ratio of their cross-sectional areas is the boost ratio of the booster cylinder.

[0026] (2) Figure 2 The reversing valve 5 is a three-position five-way signal-controlled reversing valve. There is a reversing valve column 9 in the reversing valve body 4, and the reversing control signal interfaces 10 and 11 are respectively installed at the two ends of the reversing valve column 9, and the holding time of the boost signal p2 connected to the control signal interface 11 is preset. The three positions of the three-position five-way hydraulically controlled reversing valve 5 are the middle position, the standby position, and the boost position. The oil ports corresponding to the five-way are the high-pressure oil port A1, the large-cavity oil port A2, the return oil port T0, the large-cavity oil port T1 of the boost cylinder, and the breathing oil chamber oil port T2;

[0027] (3) Figure 1 The middle reversing valve 5 is in the middle position, and the reversing valve column 9 moves to the middle position. Figure 3 The flow direction of the hydraulic oil in the reversing valve body 8 shown in a, the main oil circuit hydraulic oil flows from the high-pressure oil port A1 into the large chamber Q1 of the telescopic cylinder, and the telescopic cylinder piston rod 14 generates thrust outward;

[0028] (4) Figure 4 When this thrust cannot overcome the digging resistance F, the excavator bucket 21 stops moving;

[0029] (5) Figure 1 Start the preparation signal p1, the reversing valve column 9 moves to the preparation position, Figure 3 b shows the flow direction of the hydraulic oil in the reversing valve body 8. The hydraulic oil in the main oil circuit flows from the high-pressure oil port A1 into the large chamber Q1 of the telescopic cylinder, and the piston rod 14 of the telescopic cylinder generates thrust outwards. At the same time, the large chamber Q2 of the booster cylinder and the breathing chamber Q4 are connected to the return oil port T0, and the hydraulic oil in the large chamber Q1 of the telescopic cylinder flows into the booster oil chamber Q3 through the booster oil port C1, pushing the booster push rod 7 to move and pushing the booster cylinder piston 6 to the bottom. The hydraulic oil in the large chamber Q2 of the booster cylinder flows into the breathing oil chamber Q4 and the return oil port T0.

[0030] (6) Figure 1 Start the boost signal p2, the reversing valve column 9 moves to the boost position, Figure 3 As shown in c, the flow direction of the hydraulic oil in the reversing valve body 8, the oil port A1 is connected to the oil port T1 connected to the large chamber Q2 of the booster cylinder, the oil port A2 connected to the large chamber Q1 of the telescopic cylinder is closed, and the oil port T2 of the breathing chamber Q4 is connected to the oil return line oil port T0. Figure 2The hydraulic oil flowing into the large chamber Q2 of the booster cylinder pushes the booster cylinder piston 6 to move, and pushes the booster push rod 7 to input the booster oil into the large chamber Q1 of the telescopic cylinder through the booster oil port C1. The oil pressure increase of the booster oil is proportional to the ratio of the cross-sectional area of ​​the booster cylinder piston 6 and the booster push rod 7. After the booster oil flows into the large chamber Q1 of the telescopic cylinder, the thrust of the telescopic cylinder piston rod 14 is increased.

[0031] (7) Figure 4 The telescopic cylinder 1 with increased thrust pushes the excavator boom 20, overcoming the excavation resistance F to allow the excavator bucket 21 to continue moving;

[0032] (8) When the boost signal holding time ends, the boost cylinder piston 6 stops moving, the boost effect ends, and the reversing valve column 9 returns to the middle position. The flow direction of the hydraulic oil in the reversing valve column 9 is as follows: Figure 3 As shown in a, the hydraulic oil input from the high-pressure oil port A1 flows into the large chamber Q1 of the telescopic cylinder again, and causes the telescopic cylinder piston rod 14 to generate thrust outward;

[0033] Then, steps (3) and (4) are repeated to input pressurized hydraulic oil into the large chamber Q1 of the telescopic cylinder again, thereby increasing the thrust of the telescopic cylinder 1.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intermittent internal pressure-increasing oil cylinder structure, comprising a telescopic oil cylinder (1), a pressure-increasing oil cylinder (2) and an excavator (22), characterized in that: A booster cylinder (2) is arranged at the bottom of the telescopic cylinder (1); one end of the booster cylinder (2) away from the telescopic cylinder (1) is fixedly connected to a cylinder support (3); the cylinder support (3) is mounted on the surface of an excavator (22); one end of the excavator (22) is provided with a boom (20) and a bucket (21); the telescopic cylinder (1) and the booster cylinder (2) are connected to each other via a booster oil port (C1); the telescopic cylinder (1) is composed of a cylinder barrel (12), a piston (13) and a piston rod (14); a small cavity oil port (B1) is provided on one side of the top of the cylinder barrel (12); the piston ( 13) is arranged inside the cylinder barrel (12), one end of the top of the cylinder barrel (12) is connected to a piston rod (14), the piston rod (14) penetrates into the cylinder barrel (12) and is connected to the piston (13), the inside of the cylinder barrel (12) and one side of the piston (13) and the piston rod (14) are separated into a telescopic cylinder large chamber (Q1), the top of the cylinder barrel (12) and corresponding to the position of the telescopic cylinder large chamber (Q1) is provided with a large chamber oil port (A2), the booster cylinder (2) is fixedly installed between the cylinder barrel (12) and the cylinder support (3), and the top of the booster cylinder (2) is provided with a reversing valve (5); The boosting oil cylinder (2) is composed of a boosting oil cylinder body (4), a boosting oil cylinder piston (6) and a boosting push rod (7). The boosting oil cylinder piston (6) and the boosting push rod (7) are arranged inside the boosting oil cylinder body (4). A reversing valve (5) is arranged outside the boosting oil cylinder body (4). The inside of the boosting oil cylinder body (4) is divided into a boosting oil chamber (Q3), a breathing oil chamber (Q4) and a boosting oil cylinder large chamber (Q2) in left and right directions by the boosting oil cylinder piston (6) and the boosting push rod (7). One end of the boosting oil chamber (Q3) is fixedly connected to the telescopic oil cylinder large chamber (Q1) through a boosting oil port (C1). A breathing oil chamber oil port (T2) and a boosting oil cylinder large chamber oil port (T1) are provided at the top of the boosting oil cylinder body (4) and at positions corresponding to the breathing oil chamber (Q4) and the boosting oil cylinder large chamber (Q2). The large chamber oil port (A2) of the telescopic oil cylinder (1), the breathing oil chamber oil port (T2) in the booster oil cylinder body (4), and the large chamber oil port (T1) of the booster oil cylinder are all in communication with the reversing valve (5) outside the booster oil cylinder body (4); The reversing valve (5) fixedly connected to the outside of the boosting oil cylinder (2) is configured as a three-position five-way signal-controlled reversing valve, the reversing valve (5) comprising a reversing valve body (8), a reversing valve column (9), a first control signal interface (10) and a second control signal interface (11), the reversing valve column (9) being arranged inside the reversing valve body (8), the top of the reversing valve body (8) being arranged with a high-pressure oil port (A1) and an oil return port (T0), the first control signal interface (10) and the second control signal interface (11) being fixedly mounted at both ends of the reversing valve column (9), one end of each of which is connected to a preparatory signal (p1) and a boosting signal (p2), respectively; The flow direction of the hydraulic oil in the reversing valve body (8) is such that the main oil circuit hydraulic oil flows from the high pressure oil port (A1) into the telescopic cylinder large chamber (Q1), and the telescopic cylinder piston rod (14) generates thrust outwards; at the same time, the booster cylinder large chamber (Q2) and the breathing oil chamber (Q4) are connected to the return oil port (T0), and the hydraulic oil in the telescopic cylinder large chamber (Q1) flows into the booster oil chamber (Q3) through the booster oil port (C1), pushing the booster push rod (7) to move and pushing the booster cylinder piston (6) to the bottom, and the hydraulic oil in the booster cylinder large chamber (Q2) flows into the breathing oil chamber (Q4) and the return oil port (T0).

2. The intermittent internal pressure-increasing oil cylinder structure according to claim 1, characterized in that: The cross-sectional area of ​​the boosting cylinder piston (6) is greater than the cross-sectional area of ​​the boosting push rod (7), and the ratio of the cross-sectional areas of the boosting cylinder piston (6) and the boosting push rod (7) is the boosting ratio of the boosting cylinder (2).

3. The intermittent internal pressure-increasing oil cylinder structure according to claim 2, characterized in that: The three positions of the reversing valve (5) are respectively a neutral position, a standby position and a boosting position, and the connecting oil ports corresponding to the five-way connection of the reversing valve (5) are a high-pressure oil port (A1), a large-cavity oil port (A2), an oil return port (T0), a boosting oil cylinder large-cavity oil port (T1) and a breathing oil chamber oil port (T2).

Images