Plunger type swing cylinder with signal output function for concrete pump

Abstract

The utility model discloses a kind of plunger type swing cylinder with signal output function for concrete pump, it is related to concrete pump component field, and its technical scheme main point is: including cylinder and total plunger, oil inlet and signal port are equipped on the cylinder, the total plunger is arranged in cylinder and can be moved along cylinder axial direction, the total plunger is equipped with cavity in one end inside cylinder, effect is through the damping effect or elastic deformation of buffer component absorption kinetic energy, slow down the moving speed of total plunger, to realize buffering effect, avoid the impact problem caused by structural restriction of traditional piston type swing cylinder;And this swing cylinder is only set oil inlet and signal port, cancel the oil outlet of traditional piston type swing cylinder, avoid the back pressure interference of oil return structure with multiple oil ports, simultaneously sealed control to the hole moving path using sealing ring A, ensure that signal port is only in set position conduction, realized the double function of hydraulic signal stable feedback and buffering.

Description

Technical Field

[0001] This utility model relates to the field of concrete pump components, and more specifically, it relates to a plunger-type swing cylinder for a concrete pump with signal output function. Background Technology

[0002] Concrete pumps are widely used both domestically and internationally as the primary equipment for long-distance concrete pipeline transportation. The swing cylinder, as one of the core components of a concrete pump, directly affects the smoothness of the entire machine's operation and its service life. The swing cylinder's function is to drive the oscillating switching of the S-valve of the concrete pump. Generally, there is one on each side, acting simultaneously on the S-valve via a rocker arm. When the concrete pump is working, the hydraulic system alternately supplies oil to one of the swing cylinders. When the swing cylinder is driven by hydraulic oil, its telescopic component extends, while the other swing cylinder passively compresses. The cylinder that actively extends is called the driving cylinder, and the cylinder that passively compresses is called the driven cylinder. When the driving cylinder reaches its longest extension state, the driven cylinder is compressed to its shortest state. At this point, the control system sends a signal to the main cylinder of the concrete pump to begin reversing. After the main cylinder has reversed to its correct position, it sends another signal to the swing cylinder to begin reversing. At this point, the original driven cylinder becomes the driving cylinder and begins to extend, and the original driving cylinder becomes the driven cylinder and begins to compress, and this cycle repeats continuously.

[0003] Generally, when a swivel cylinder extends or retracts to its designated position, a proximity switch detects the position and sends an electrical signal to the control system. However, proximity switches are easily damaged by vibrations, dirt, and other factors, making this control method unstable. Therefore, a hydraulic signal feedback control method is commonly used. This method designs the swivel cylinder with a special structure that automatically generates a pressure signal after extending to the set position. However, traditional swivel cylinders that generate pressure signals are generally piston-type swivel cylinders. Piston-type swivel cylinders typically have an oil inlet, an oil outlet, and a signal port. This structure can cause the swivel cylinder to generate incorrect signals at startup due to factors such as the back pressure of the main cylinder return oil, leading to hydraulic system reversal disorder. Furthermore, due to structural limitations, piston-type swivel cylinders are not suitable for incorporating complex and effective buffer structures, which can cause significant impacts during equipment operation.

[0004] Therefore, in order to solve the above-mentioned technical problems, this application proposes a plunger-type swing cylinder for a concrete pump with signal output function. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a plunger-type swing cylinder for concrete pumps with signal output function.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a plunger-type swing cylinder for a concrete pump with signal output function, comprising a cylinder body and a main plunger. The cylinder body is provided with an oil inlet and a signal port. The main plunger passes through the cylinder body and can move axially along the cylinder body. A cavity is opened at one end of the main plunger inside the cylinder body. A buffer component that cooperates with the inner surface of the cylinder body is provided in the cavity. A sealing ring A is provided in the cylinder body between the oil inlet and the signal port. A channel is opened on the main plunger, and the sealing ring A is located on the movement path of the channel.

[0007] Preferably, the buffer component includes a buffer plunger disposed at the cavity opening, and a spring is installed between the buffer plunger and the inner surface of the cavity, and the buffer plunger has a damping hole communicating with the inside of the cavity.

[0008] Preferably, the sealing ring A is a two-way sealing structure, and its inner side is made of rigid engineering plastic material.

[0009] Preferably, a sealing ring B is also provided inside the cylinder, and the signal port is located between the sealing ring A and the sealing ring B.

[0010] Preferably, the oil inlet and signal port are welded to the side wall of the cylinder block.

[0011] Preferably, the inner wall of the cylinder is provided with a wear-resistant coating, which covers the movement path of the main plunger.

[0012] Preferably, a buffer is installed at the end of the buffer plunger.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model absorbs kinetic energy through the damping effect or elastic deformation of the buffer component, thereby slowing down the movement speed of the main plunger and achieving a buffering effect, avoiding the impact problem caused by the structural limitations of traditional piston-type swing cylinders; moreover, this swing cylinder eliminates the oil outlet of traditional piston-type swing cylinders by only setting an oil inlet and a signal port, avoiding the back pressure interference caused by the multi-port structure. At the same time, the sealing ring A is used to control the sealing of the channel movement path, ensuring that the signal port is only connected at the set position, realizing the dual functions of stable hydraulic signal feedback and buffering, so as to solve the problems in the background technology.

[0015] 2. In this utility model, the sealing ring B sets a sealing boundary on the side of the signal port away from the oil inlet, which together with the sealing ring A defines the effective conduction area of ​​the channel, ensuring that the signal is triggered only when the main plunger moves to the preset position, avoiding signal misjudgment or missed judgment due to the main plunger being out of position, and further ensuring the stability of the output signal.

[0016] 3. This utility model absorbs high-frequency impact energy through the elastic deformation of the buffer pad, reduces the instantaneous impact force of the buffer plunger, and avoids rigid impact, noise and component wear caused by direct collision of traditional metal parts. Especially under high-frequency reciprocating motion conditions, it can effectively extend the service life of the cylinder and the buffer plunger.

[0017] 4. This utility model effectively resists scratches, wear and material fatigue caused by high-pressure friction through a wear-resistant coating, and avoids metal debris generated by wear on the inner wall of the cylinder from contaminating the hydraulic system or causing the main plunger to jam. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] In the diagram: 1. Cylinder block; 101. Working chamber; 2. Main plunger; 201. Cavity; 3. Oil inlet; 4. Signal port; 5. Buffer component; 501. Buffer plunger; 502. Spring; 503. Damping hole; 6. Sealing ring A; 7. Channel; 8. Sealing ring B. Detailed Implementation

[0021] like Figure 1 As shown, this utility model provides a plunger-type swing cylinder for a concrete pump with signal output function, including a cylinder body 1 (the internal chamber of the cavity 1 is named the working chamber 101) and a main plunger 2. The cylinder body 1 is provided with an oil inlet 3 and a signal port 4 (the oil inlet 3 and the signal port 4 are welded to the side wall of the cylinder body 1). The main plunger 2 passes through the cylinder body 1 and can move along the axial direction of the cylinder body 1. A cavity 201 is opened at one end of the main plunger 2 inside the cylinder body 1. A buffer component 5 that cooperates with the inner surface of the cylinder body 1 is provided in the cavity 201. A sealing ring A6 is provided in the cylinder body 1 between the oil inlet 3 and the signal port 4. A channel 7 is opened on the main plunger 2, and the sealing ring A6 is located on the moving path of the channel 7.

[0022] When hydraulic oil is injected from the inlet 3 of cylinder 1, it pushes the main plunger 2, which passes through cylinder 1, to move axially. During the movement of the main plunger 2, the channel 7 on it moves with the main plunger 2. When the channel 7 moves to coincide with the position of the sealing ring A6 in cylinder 1, the channel 7 connects the inlet 3 and the signal port 4 (the buffer component 5 is provided with a channel communicating with the cavity 201, namely the damping hole 503 mentioned later, so that hydraulic oil can enter the cavity 201, and the channel 7 connects the inlet 3 and the signal port 4). The hydraulic oil flows out from the signal port 4 through the channel 7, forming a hydraulic signal feedback to the control system, realizing the accurate detection of the cylinder position; when the main plunger 2 moves to the end of cylinder 1, its cavity The buffer component 5 inside 201 contacts and engages with the inner surface of the cylinder body 1. Through the damping effect or elastic deformation of the buffer component 5, the kinetic energy of the movement is absorbed, thereby slowing down the movement speed of the main plunger 2 and achieving a buffering effect. This avoids the impact problem caused by the structural limitations of traditional piston-type swing cylinders. Moreover, this swing cylinder eliminates the oil outlet of traditional piston-type swing cylinders by only setting the oil inlet 3 and the signal port 4 (the oil outlet is generally large, and the connected pipeline is thick, which is not only troublesome to install but also has high operating costs). This avoids the back pressure interference caused by the multi-port structure. At the same time, the sealing ring A6 is used to seal and control the movement path of the channel 7 to ensure that the signal port 4 is only connected at the set position, realizing the dual functions of stable hydraulic signal feedback and buffering.

[0023] In summary, this swing cylinder has only two oil ports, oil inlet 3 and signal port 4, and is equipped with a buffer structure. Signal port 4 is not affected by oil return, and has the advantages of stable signal, low impact, and simple supporting pipeline, while reducing the overall operating cost of the equipment.

[0024] The buffer component 5 includes a buffer plunger 501 disposed at the opening of the cavity 201, and a spring 502 is installed between the buffer plunger 501 and the inner surface of the cavity 201. The buffer plunger 501 is provided with a damping hole 503 that communicates with the inside of the cavity 201.

[0025] When hydraulic oil enters the cylinder body 1 through inlet 3, the pressure acts on the left side of the main plunger 2, causing the main plunger 2 to move from left to right. When the channel 7 on the main plunger 2 passes through the sealing ring A6, the channel 7 connects with the signal port 4. The hydraulic oil passes through the damping hole 503 on the buffer plunger 501 and enters the cavity 201 where the spring 502 is located, and flows out from the signal port 4. Upon receiving this signal, the hydraulic system controls the main cylinder reversing valve to switch the direction, causing the main cylinder to change its direction of movement. After the main cylinder reaches its position, the hydraulic system controls the reversing valve of the swing cylinder to switch the swing cylinder between the active and driven cylinders. After the swing cylinder switches to the driven cylinder, the main plunger 2 moves to the left under the action of the rocker arm. At this time, the channel 7 passes through the sealing ring A6 from right to left. It should be noted that the sealing ring A6 is a bidirectional seal. When the channel 7 is located to the left of the sealing ring A6, the hydraulic oil supply to the signal port 4 will be cut off. The inner ring of the sealing ring A6 is made of hard engineering plastic, which ensures that the channel 7 can pass through normally without damage. As the main plunger 2 continues to move to the left until the buffer plunger 501 contacts the inner surface of the cylinder body 1, the buffer plunger 501 stops moving while the main plunger 2 continues to move to the left. At this time, the volume of the cavity 201 where the spring 502 is located decreases, and the hydraulic oil inside will slowly be discharged from the damping hole 503 on the buffer plunger 501, thus rapidly reducing the operating speed of the plunger together with the spring 502 to achieve a buffering effect. When the main plunger 2 moves to the right, the spring 502 will cause the buffer plunger 501 to return to the extended position.

[0026] Furthermore, firstly, this invention also provides a sealing ring B8 inside the cylinder 1 on the side of the signal port 4 away from the oil inlet 3. The signal port 4 is located between the sealing rings A6 and B8. The signal port 4 is connected to the working chamber 101 through the damping hole 503 only when the channel 7 is between the sealing rings A6 and B8. When the channel 7 is not in this position, it is completely isolated by the sealing rings A6 and B8, so there will be no signal output. In this way, the sealing ring B8, by setting a sealing boundary on the side of the signal port 4 away from the oil inlet 3, together with the sealing ring A8, defines the effective conduction area of ​​the channel 7, ensuring that the signal is triggered only when the main plunger 2 moves to the preset position, avoiding signal misjudgment or missed judgment due to the main plunger 2 being over-positioned, and further ensuring the stability of the output signal.

[0027] Secondly, a buffer pad is installed at the end of the buffer plunger 501. When the buffer plunger 501 contacts the end of the cylinder 1, the buffer pad absorbs high-frequency impact energy through elastic deformation, reduces the instantaneous impact force of the buffer plunger 501, and avoids rigid impact, noise and component wear caused by direct collision of traditional metal parts. Especially under high-frequency reciprocating motion conditions, it can effectively extend the service life of the cylinder 1 and the buffer plunger 501. The buffer pad is preferably made of polyurethane elastomer material, which has high strength, impact resistance and excellent oil resistance, and can work stably for a long time in the hydraulic oil environment.

[0028] Finally, this utility model also sprays a wear-resistant coating (the material can be nickel-phosphorus alloy, ceramic coating, etc.) on the inner wall of the cylinder body 1. The wear-resistant coating covers the movement path of the main plunger 2. By strengthening the surface wear resistance in the contact area of ​​the high-frequency reciprocating motion of the main plunger 2, it effectively resists the scratches, wear and material fatigue caused by high-pressure friction, and avoids the contamination of the hydraulic system by metal debris generated by the wear of the inner wall of the cylinder body 1 or the jamming of the main plunger 2.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A plunger-type swing cylinder for a concrete pump with signal output function, characterized in that: The cylinder includes a cylinder body (1) and a main plunger (2). The cylinder body (1) is provided with an oil inlet (3) and a signal port (4). The main plunger (2) passes through the cylinder body (1) and can move along the cylinder body (1) axially. The main plunger (2) has a cavity (201) at one end inside the cylinder body (1). A buffer component (5) that matches the inner surface of the cylinder body (1) is provided in the cavity (201). A sealing ring A (6) is provided in the cylinder body (1) between the oil inlet (3) and the signal port (4). A channel (7) is provided on the main plunger (2). The sealing ring A (6) is located on the moving path of the channel (7).

2. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 1, characterized in that: The buffer component (5) includes a buffer plunger (501) disposed at the opening of the cavity (201), and a spring (502) is installed between the buffer plunger (501) and the inner surface of the cavity (201). The buffer plunger (501) is provided with a damping hole (503) that communicates with the inside of the cavity (201).

3. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 1, characterized in that: The sealing ring A (6) is a two-way sealing structure, and its inner side is made of hard engineering plastic material.

4. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 1, characterized in that: A sealing ring B (8) is also provided on the side of the cylinder (1) away from the oil inlet (3) from the signal port (4).

5. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 1, characterized in that: The oil inlet (3) and signal port (4) are welded to the side wall of the cylinder block (1).

6. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 1, characterized in that: The inner wall of the cylinder (1) is coated with a wear-resistant coating, which covers the movement path of the main plunger (2).

7. A plunger-type swing cylinder for a concrete pump with signal output function according to claim 2, characterized in that: The buffer plunger (501) has a buffer pad installed at its end.

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