Pumping systems and pumping machinery

Abstract

The present invention provides a pumping system and a pumping machine, including a main oil cylinder and a locking mechanism. A multi-stage oil cylinder is embedded in the main oil cylinder, the piston rod of the previous oil cylinder is the cylinder barrel of the next oil cylinder, and the piston of the next oil cylinder is located in the cylinder barrel of the previous oil cylinder. The rodless chambers of the oil cylinders at each stage are connected, and the rod chambers of the oil cylinders at each stage are connected. The locking mechanism is used to cut off or conduct the rod chambers of the oil cylinders at each stage to control the action sequence of the multi-stage oil cylinders, so that the piston rods of the oil cylinders at each stage move in an orderly manner, and ensure the stable and reliable operation of the system. In a pumping process, when the piston rod of the previous oil cylinder moves to the limit position, the piston rod of the next oil cylinder starts to move, which greatly increases the concrete pumping volume and improves the pumping efficiency. The provision of a multi-stage oil cylinder can reduce the proportion of the main oil cylinder length in the length of the pumping system, reasonably utilize space, increase the proportion of the delivery cylinder length in the length of the pumping system, and can also reduce the inclination angle of the pumping system and improve the material absorption of the pumping system.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete pumping equipment, and in particular to a pumping system and a pumping machine. Background Art

[0002] A concrete pump truck is a machine that uses pressure to continuously transport concrete along a pipeline. It consists of a pumping system, a delivery pipeline, etc.

[0003] However, the main oil cylinder of the existing pumping system is a single-stage oil cylinder, the concrete pumping volume is small, and the pumping efficiency is low. In addition, the length of the main oil cylinder accounts for too large a proportion of the length of the pumping system, which restricts the length of the delivery cylinder. At the same time, due to the restrictions of the installation space of the chassis, the length of the main oil cylinder, and the length of the delivery cylinder, the inclination angle of the pumping system is too large, which is not conducive to the suction of concrete. Summary of the invention

[0004] The object of the present invention is to provide a pumping system and a pumping machine to solve the problems existing in the prior art.

[0005] The present invention provides a pumping system, comprising:

[0006] A master cylinder, comprising a multi-stage cylinder embedded in the master cylinder, wherein the piston rod of the first stage cylinder in the multi-stage cylinder is the cylinder barrel of the second stage cylinder, the piston of the second stage cylinder is arranged in the cylinder barrel of the first stage cylinder, the rodless chamber of the first stage cylinder is connected to the rodless chamber of the second stage cylinder, and the rod chamber of the first stage cylinder is connected to the rod chamber of the second stage cylinder;

[0007] A locking mechanism is used to cut off or connect the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder to control the action sequence of the multi-stage oil cylinder; when the locking mechanism cuts off the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder, the piston rod of the previous stage oil cylinder drives the piston rod of the subsequent stage oil cylinder to move simultaneously; when the locking mechanism connects the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder, the piston rod of the subsequent stage oil cylinder moves alone.

[0008] According to the pumping system provided by the present invention, the locking mechanism comprises:

[0009] A first oil passage is provided through the piston and the piston rod of the preceding oil cylinder, wherein a first end of the first oil passage is connected to the rod chamber of the succeeding oil cylinder;

[0010] The second oil passage and the third oil passage are respectively arranged at two ends of the cylinder barrel of the previous oil cylinder, the first ends of the second oil passage and the third oil passage can be connected to the second end of the first oil passage, and the second ends are connected to the rod chamber of the previous oil cylinder;

[0011] Among them, when the first end of the second oil channel or the third oil channel is misaligned with the second end of the first oil channel, the rod chamber of the previous oil channel and the rod chamber of the subsequent oil channel are in a truncated state; when the first end of the second oil channel or the third oil channel is aligned with the second end of the first oil channel, the rod chamber of the previous oil channel and the rod chamber of the subsequent oil channel are in a connected state.

[0012] According to the pumping system provided by the present invention, the first oil passage comprises:

[0013] A first oil branch passage is provided through the piston rod of the preceding oil cylinder, wherein a first end of the first oil branch passage is connected to a rod chamber of the succeeding oil cylinder;

[0014] The second oil channel is arranged through the piston of the previous oil cylinder. The first end of the second oil channel is connected to the second end of the first oil channel, and the second end can be connected to the first ends of the second oil channel and the third oil channel.

[0015] According to the pumping system provided by the present invention, the first end of the first oil branch channel is located at an end of the piston rod of the previous oil cylinder away from the piston of the previous oil cylinder.

[0016] According to the pumping system provided by the present invention, the locking mechanism comprises:

[0017] An oil passage, one end of which is connected to the rod chamber of the preceding oil cylinder, and the other end of which is connected to the rod chamber of the succeeding oil cylinder;

[0018] A control valve is arranged in the oil passage, and the control valve is used to control the cutoff or conduction of the oil passage;

[0019] Among them, when the control valve is in a closed state, the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder are in a cut-off state; when the control valve is in an open state, the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder are in a conducting state.

[0020] According to the pumping system provided by the present invention, the control valve is a solenoid valve.

[0021] The pumping system provided according to the present invention further comprises a delivery cylinder, in which a concrete piston is arranged, and the piston rod of the last-stage oil cylinder in the multi-stage oil cylinder is connected to the concrete piston.

[0022] According to the pumping system provided by the present invention, the master cylinder is provided with a first oil port communicated with the rodless chamber of the master cylinder and a second oil port communicated with the rod chamber of the master cylinder.

[0023] According to the pumping system provided by the present invention, there are two master oil cylinders, and the pumping system also includes a first conversion valve for connecting or cutting off the first oil ports of the two master oil cylinders and a second conversion valve for connecting or cutting off the second oil ports of the two master oil cylinders.

[0024] The present invention further provides a pumping machine, comprising a vehicle body and a pumping system arranged on the vehicle body, wherein the pumping system is the pumping system as described in any one of the above items.

[0025] The pumping system provided by the present invention comprises a master cylinder and a locking mechanism. The master cylinder comprises a multi-stage cylinder embedded in the master cylinder, wherein the piston rod of the first stage cylinder in the multi-stage cylinder is the cylinder barrel of the second stage cylinder, and the piston of the second stage cylinder is arranged in the cylinder barrel of the first stage cylinder. The rodless chamber of the first stage cylinder is connected to the rodless chamber of the second stage cylinder, and the rod chamber of the first stage cylinder is connected to the rod chamber of the second stage cylinder. The locking mechanism is used to cut off or connect the rod chamber of the first stage cylinder and the rod chamber of the second stage cylinder to control the action sequence of the multi-stage cylinder. When the locking mechanism cuts off the rod chamber of the first stage cylinder and the rod chamber of the second stage cylinder, the piston rod of the first stage cylinder drives the piston rod of the second stage cylinder to move simultaneously. When the locking mechanism connects the rod chamber of the first stage cylinder and the rod chamber of the second stage cylinder, the piston rod of the second stage cylinder moves alone. Thus, the piston rods of each stage cylinder move in an orderly manner, ensuring the stable and reliable operation of the system. With such a configuration, under the action of the locking mechanism, during a pumping process, when the piston rod of the first-stage oil cylinder moves to the limit position, the piston rod of the next-stage oil cylinder starts to move. In this way, the piston rods of each stage move in sequence, which greatly increases the concrete pumping volume and improves the pumping efficiency. Setting up multiple stages of oil cylinders at the same time can reduce the proportion of the main oil cylinder length in the length of the pumping system, reasonably utilize the installation space, increase the proportion of the delivery cylinder length in the length of the pumping system, and reduce the inclination of the pumping system, thereby improving the material absorption of the pumping system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is one of the structural schematic diagrams of the pumping system provided by the present invention;

[0028] Figure 2 This is the second structural schematic diagram of the pumping system provided by the present invention;

[0029] Figure 3 yes Figure 2 Partial schematic diagram at point A in the middle;

[0030] Figure 4 It is a structural schematic diagram of the pumping system provided by the present invention when it is in a high-pressure pumping state;

[0031] Figure 5 It is a structural schematic diagram of the pumping system provided by the present invention when it is in a low-pressure pumping state;

[0032] Reference numerals:

[0033] 1: Main cylinder; 2: First-stage cylinder piston; 3: First-stage cylinder piston rod;

[0034] 4: Secondary oil cylinder piston; 5: Secondary oil cylinder piston rod; 6: First oil channel;

[0035] 7: Second oil channel; 8: Third oil channel; 9: First oil channel;

[0036] 10: Second oil channel; 11: Delivery cylinder; 12: Concrete piston;

[0037] 13: First oil port; 14: Second oil port. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0039] Combine the following Figures 1 to 5 The pumping system of the present invention is described.

[0040] like Figures 1 to 3 As shown, an embodiment of the present invention provides a pumping system, including a main oil cylinder 1 and a locking mechanism. The main oil cylinder 1 includes a multi-stage oil cylinder embedded in the main oil cylinder 1. The piston rod of the first-stage oil cylinder in the multi-stage oil cylinder is the cylinder barrel of the second-stage oil cylinder, and the piston of the second-stage oil cylinder is arranged in the cylinder barrel of the first-stage oil cylinder. The rodless chamber of the first-stage oil cylinder is connected to the rodless chamber of the second-stage oil cylinder, and the rod chamber of the first-stage oil cylinder is connected to the rod chamber of the second-stage oil cylinder. Specifically, as Figure 1As shown, the following description is based on the example of a multi-stage oil cylinder being set as a two-stage oil cylinder. The first-stage oil cylinder piston 2 and the first-stage oil cylinder piston rod 3 are arranged in the cavity in the main oil cylinder 1, and the main oil cylinder 1 is the cylinder barrel of the first-stage oil cylinder. The second-stage oil cylinder piston 4 and the second-stage oil cylinder piston rod 5 are arranged in the cavity in the first-stage oil cylinder piston rod 3, and the first-stage oil cylinder piston rod 3 is the cylinder barrel of the second-stage oil cylinder. The rodless cavity on the left side of the first-stage oil cylinder and the second-stage oil cylinder is connected, and the rod cavity on the right side of the first-stage oil cylinder and the second-stage oil cylinder is connected.

[0041] The locking mechanism is used to cut off or connect the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder to control the action sequence of the multi-stage oil cylinder. When the locking mechanism cuts off the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder, the piston rod of the previous oil cylinder drives the piston rod of the next oil cylinder to move simultaneously. When the locking mechanism connects the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder, the piston rod of the next oil cylinder moves alone. Specifically, Figure 1 As shown, when the master cylinder 1 is in the extension stroke, the locking mechanism first cuts off the rod chambers of the primary and secondary cylinders, at which time the piston rod 3 of the primary cylinder first extends from left to right, and the piston rod 5 of the secondary cylinder moves synchronously with the piston rod 3 of the primary cylinder and does not extend. When the piston rod 3 of the primary cylinder moves to the right extreme position, the locking mechanism connects the rod chambers of the primary and secondary cylinders, at which time the piston rod 5 of the secondary cylinder extends from left to right alone. Conversely, when the master cylinder 1 is in the retraction stroke, the locking mechanism first cuts off the rod chambers of the primary and secondary cylinders, at which time the piston rod 3 of the primary cylinder first retracts from right to left, and the piston rod 5 of the secondary cylinder moves synchronously with the piston rod 3 of the primary cylinder and does not retract. When the piston rod 3 of the primary cylinder moves to the left extreme position, the locking mechanism connects the rod chambers of the primary and secondary cylinders, at which time the piston rod 5 of the secondary cylinder retracts from right to left alone. This allows the piston rods of each level of oil cylinder to move in an orderly manner, ensuring stable and reliable operation of the system. Figure 1 For the placement of the pumping system shown in the figure, the left and right directions in the figure refer to the left and right directions.

[0042] With such an arrangement, during a pumping process, when the piston rod of the previous cylinder moves to the limit position, the piston rod of the next cylinder starts to move. In this way, the piston rods of each level of cylinder move in sequence, which greatly increases the concrete pumping volume and improves the pumping efficiency. Setting up multiple cylinders at the same time can reduce the proportion of the main cylinder 1 in the length of the pumping system, make rational use of the installation space, increase the proportion of the delivery cylinder 11 in the length of the pumping system, and reduce the inclination of the pumping system, thereby improving the material absorption of the pumping system.

[0043] In addition, the existing pumping system only relies on the piston force area to control the action sequence of each level of the oil cylinder when pumping concrete, which leads to lag and jamming when the oil cylinders of each level move, and cannot effectively control the order of extension and retraction of the oil cylinders of each level. The present invention uses a locking mechanism to seal the hydraulic oil channel to effectively ensure that the piston rods of the oil cylinders of each level move in sequence, and the movement is more sensitive and reliable, ensuring the stability and reliability of the system operation.

[0044] In one embodiment, the locking mechanism includes a first oil passage 6, a second oil passage 7 and a third oil passage 8. Specifically, Figure 2 As shown, the first oil passage 6 is set through the first oil cylinder piston 2 and the first oil cylinder piston rod 3, and its first end is connected to the rod chamber of the second oil cylinder. The second oil passage 7 and the third oil passage 8 are respectively set at the left and right ends of the main oil cylinder 1. The first ends of the second oil passage 7 and the third oil passage 8 are Figure 2 The left end can be connected to the second end of the first oil passage 6, and the second end is Figure 2 The middle right end is connected to the rod chamber of the first-stage oil cylinder. Figure 2 For the placement of the pumping system shown in the figure, the left and right directions in the figure refer to the left and right directions.

[0045] When the first end of the second oil passage 7 or the third oil passage 8 is misaligned with the second end of the first oil passage 6, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a cut-off state. When the first end of the second oil passage 7 or the third oil passage 8 is aligned with the second end of the first oil passage 6, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state.

[0046] With such arrangement, during the movement of the multi-stage oil cylinder, the first oil passage 6, the second oil passage 7 and the third oil passage 8 cooperate with each other, and the piston movement is utilized to form a self-sealing of the rod chamber hydraulic oil passage, thereby achieving the purpose of sequential movement of the multi-stage oil cylinder and completing the concrete pumping process, with a simple structure and convenient operation.

[0047] Furthermore, the first oil passage 6 includes a first branch oil passage 9 and a second branch oil passage 10. Specifically, the first branch oil passage 9 is provided through the piston rod 3 of the first oil cylinder, and its first end is connected to the rod chamber of the second oil cylinder. The second branch oil passage 10 is provided through the piston 2 of the first oil cylinder, and its first end is connected to the second end of the first branch oil passage 9, and the second end can be connected to the first ends of the second oil passage 7 and the third oil passage 8. Thus, a hydraulic oil passage is formed in which the rod chamber of the second oil cylinder can be connected to the rod chamber of the first oil cylinder, and the structural design is more reasonable.

[0048] In a specific embodiment of the present invention, the first end of the first oil channel 9 is located at the end of the piston rod of the previous oil cylinder away from the piston of the previous oil cylinder. Figure 2As shown, the first end of the first oil channel 9 is located at the right end of the first-stage oil cylinder piston rod 3, which can effectively ensure that the second-stage oil cylinder piston rod 5 moves to the limit position.

[0049] In the embodiment of the present invention, the pumping system further includes a delivery cylinder 11, in which a concrete piston 12 is provided, and the piston rod of the last-stage oil cylinder in the multi-stage oil cylinder is connected to the concrete piston 12. Specifically, the piston rod 5 of the secondary oil cylinder is connected to the concrete piston 12, so that concrete is sucked into or pushed out of the delivery cylinder 11 under the action of the main oil cylinder 1. A single-stage concrete piston is provided in the delivery cylinder 11, and there is no step structure in the cylinder barrel, so as to avoid the problem of material accumulation in the delivery cylinder 11 when the pumping volume is large, resulting in lower and lower pumping efficiency.

[0050] like Figure 2 As shown, the master cylinder 1 is provided with a first oil port 13 connected to the rodless chamber of the master cylinder 1 and a second oil port 14 connected to the rod chamber of the master cylinder 1. The second oil port 14 is also connected to the third oil passage 8. Thus, the hydraulic oil circulates in the cylinder to complete the pumping operation.

[0051] Generally, in the pumping system, two master oil cylinders 1 are provided. In addition, the pumping system further includes a first switching valve for connecting or disconnecting the first oil ports 13 of the two master oil cylinders 1 and a second switching valve for connecting or disconnecting the second oil ports 14 of the two master oil cylinders 1. In this way, during operation, according to the working condition requirements, the high and low pressures are switched through the switching valve to ensure efficient and rapid operation of the pumping system.

[0052] Based on the above embodiments, the working process of the pumping system is as follows:

[0053] like Figure 4 As shown, when high pressure pumping, the hydraulic oil flows from Figure 4 The first oil port 13 of the left main oil cylinder 1 enters the rodless chamber, pushing the first oil cylinder piston 2 and the second oil cylinder piston 4 to move; the second oil ports 14 of the two main oil cylinders 1 are connected, Figure 4 The first oil port 13 of the right main oil cylinder 1 returns oil. Figure 4 The direction indicated by the solid arrow is the flow direction of the hydraulic oil.

[0054] Figure 4 Left side of the main oil cylinder 1: When the hydraulic oil enters the rodless chamber, the second end of the first oil channel 6 is pushed away from the second oil channel 7 in a short time and is misaligned with the first end of the second oil channel 7. At this time, the first oil channel 6 is sealed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a truncated state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 4 Movement in the direction indicated by the hollow arrow.

[0055] When the second end of the first oil passage 6 moves to align with the first end of the third oil passage 8, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, the rod chamber of the second oil cylinder leaks oil, and the piston rod 5 of the second oil cylinder moves forward alone, thereby pushing the concrete out of the delivery cylinder 11.

[0056] Figure 4 Middle right main oil cylinder 1: When the hydraulic oil is pressed into the rod chamber of the first oil cylinder from the second oil port 14, the second end of the first oil channel 6 is pushed away from the third oil channel 8 and misaligned with the first end of the third oil channel 8. At this time, the first oil channel 6 is sealed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a truncated state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 4 Movement in the direction indicated by the hollow arrow.

[0057] When the second end of the first oil passage 6 moves to align with the first end of the second oil passage 7, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, oil flows into the rod chamber of the second oil cylinder, and the piston rod 5 of the second oil cylinder moves forward alone, thereby sucking concrete into the delivery cylinder 11.

[0058] The two main oil cylinders 1 cooperate at the same time, and the hydraulic oil enters and exits one by one to complete high-pressure pumping.

[0059] like Figure 5 As shown, when pumping at low pressure, the hydraulic oil flows from Figure 5 The second oil port 14 of the right master cylinder 1 enters the rod chamber, pushing the first-stage cylinder piston 2 and the second-stage cylinder piston 4 to move; the first oil ports 13 of the two master cylinders 1 are connected, Figure 4 The oil returns from the second oil port 14 of the left main oil cylinder 1. Figure 5 The direction indicated by the solid arrow is the flow direction of the hydraulic oil.

[0060] Figure 5 The main oil cylinder 1 on the right side of the middle: When the hydraulic oil enters the rod chamber, the second end of the first oil channel 6 is pushed away from the third oil channel 8 in a short time and is misaligned with the first end of the third oil channel 8. At this time, the first oil channel 6 is sealed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a truncated state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 5 Movement in the direction indicated by the hollow arrow.

[0061] When the second end of the first oil passage 6 moves to align with the first end of the second oil passage 7, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, oil flows into the rod chamber of the second oil cylinder, and the piston rod 5 of the second oil cylinder moves forward alone, thereby sucking concrete into the delivery cylinder 11.

[0062] Figure 5Left side of the main oil cylinder 1: When the hydraulic oil is pressed into the rodless chamber from the first oil port 13, the second end of the first oil channel 6 is pushed away from the second oil channel 7 and misaligned with the first end of the second oil channel 7. At this time, the first oil channel 6 is sealed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a truncated state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 5 Movement in the direction indicated by the hollow arrow.

[0063] When the second end of the first oil passage 6 moves to align with the first end of the third oil passage 8, the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, the rod chamber of the second oil cylinder leaks oil, and the piston rod 5 of the second oil cylinder moves forward alone, thereby pushing the concrete out of the delivery cylinder 11.

[0064] The two main oil cylinders 1 cooperate at the same time, and the hydraulic oil enters and exits one by one to complete low-pressure pumping.

[0065] In another embodiment, the difference from the above embodiments is that the locking mechanism includes an oil passage and a control valve arranged in the oil passage. Specifically, one end of the oil passage is connected to the rod chamber of the first-stage oil cylinder, and the other end is connected to the rod chamber of the second-stage oil cylinder, thereby connecting the rod chambers of the two-stage oil cylinders. The control valve is used to control the cutoff or conduction of the oil passage. Optionally, the control valve is a solenoid valve. Among them, when the solenoid valve is in a closed state, the oil passage is sealed, and the rod chamber of the first-stage oil cylinder and the rod chamber of the second-stage oil cylinder are in a cutoff state. When the solenoid valve is in an open state, the oil passage is unsealed, and the rod chamber of the first-stage oil cylinder and the rod chamber of the second-stage oil cylinder are in a conducting state. The specific working process is as follows:

[0066] like Figure 4 As shown, when high pressure pumping, the hydraulic oil flows from Figure 4 The first oil port 13 of the left main oil cylinder 1 enters the rodless chamber, pushing the first oil cylinder piston 2 and the second oil cylinder piston 4 to move; the second oil ports 14 of the two main oil cylinders 1 are connected, Figure 4 The first oil port 13 of the right main oil cylinder 1 returns oil. Figure 4 The direction indicated by the solid arrow is the flow direction of the hydraulic oil.

[0067] Figure 4 The main oil cylinder 1 on the left side of the middle: When the piston 2 of the first oil cylinder starts to move, the solenoid valve is closed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a truncated state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 4 Movement in the direction indicated by the hollow arrow.

[0068] When the piston 2 of the first oil cylinder moves to the limit position, the solenoid valve opens, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, the rod chamber of the second oil cylinder leaks oil, and the piston rod 5 of the second oil cylinder moves forward alone, thereby pushing the concrete out of the delivery cylinder 11.

[0069] Figure 4 The main oil cylinder 1 on the right side of the middle: When the hydraulic oil is pressed into the rod chamber of the first oil cylinder from the second oil port 14, the piston 2 of the first oil cylinder starts to move, the solenoid valve is closed, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a cut-off state, so that the piston rod 3 of the first oil cylinder drives the piston rod 5 of the second oil cylinder to move forward as a whole at the same speed, that is, along Figure 4 Movement in the direction indicated by the hollow arrow.

[0070] When the piston 2 of the first oil cylinder moves to the limit position, the solenoid valve opens, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, oil enters the rod chamber of the second oil cylinder, and the piston rod 5 of the second oil cylinder moves forward alone, thereby sucking concrete into the delivery cylinder 11.

[0071] The two main oil cylinders 1 cooperate at the same time, and the hydraulic oil enters and exits one by one to complete high-pressure pumping.

[0072] like Figure 5 As shown, when pumping at low pressure, the hydraulic oil flows from Figure 5 The second oil port 14 of the right master cylinder 1 enters the rod chamber, pushing the first-stage cylinder piston 2 and the second-stage cylinder piston 4 to move; the first oil ports 13 of the two master cylinders 1 are connected, Figure 4 The oil returns from the second oil port 14 of the left main oil cylinder 1. Figure 5 The direction indicated by the solid arrow is the flow direction of the hydraulic oil.

[0073] Figure 5 The main oil cylinder 1 on the right side of the middle: When the hydraulic oil enters the rod chamber, the piston 2 of the first-stage oil cylinder starts to move, the solenoid valve is closed, and the rod chamber of the first-stage oil cylinder and the rod chamber of the second-stage oil cylinder are in a truncated state, so that the piston rod 3 of the first-stage oil cylinder drives the piston rod 5 of the second-stage oil cylinder to move forward as a whole at the same speed, that is, along Figure 5 Movement in the direction indicated by the hollow arrow.

[0074] When the piston 2 of the first oil cylinder moves to the limit position, the solenoid valve opens, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, oil enters the rod chamber of the second oil cylinder, and the piston rod 5 of the second oil cylinder moves forward alone, thereby sucking concrete into the delivery cylinder 11.

[0075] Figure 5The left main cylinder 1: When the hydraulic oil is pressed into the rodless chamber from the first oil port 13, the first-stage cylinder piston 2 starts to move, the solenoid valve is closed, and the rod chamber of the first-stage cylinder and the rod chamber of the second-stage cylinder are in a cut-off state, so that the first-stage cylinder piston rod 3 drives the second-stage cylinder piston rod 5 to move forward as a whole at the same speed, that is, along the Figure 5 Movement in the direction indicated by the hollow arrow.

[0076] When the piston 2 of the first oil cylinder moves to the limit position, the solenoid valve opens, and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are in a conducting state. At this time, the rod chamber of the second oil cylinder leaks oil, and the piston rod 5 of the second oil cylinder moves forward alone, thereby pushing the concrete out of the delivery cylinder 11.

[0077] The two main oil cylinders 1 cooperate at the same time, and the hydraulic oil enters and exits one by one to complete low-pressure pumping.

[0078] The pumping machine provided by the present invention is described below. The pumping machine described below and the pumping system described above can be referred to in correspondence with each other.

[0079] The embodiments of the present invention further provide a pumping machine. Specifically, the pumping machine is, for example, a concrete pump truck, a vehicle-mounted pump, a towed pump, etc. The pumping machine includes a vehicle body and a pumping system arranged on the vehicle body, and the pumping system is a pumping system as provided in the above embodiments. With such an arrangement, during a pumping process, the piston rods of the oil cylinders at each stage move in sequence, which greatly increases the concrete pumping volume and improves the pumping efficiency. At the same time, the multi-stage oil cylinder arrangement can reduce the proportion of the length of the main oil cylinder 1 in the length of the pumping system, reasonably utilize the installation space, increase the proportion of the length of the delivery cylinder 11 in the length of the pumping system, and also reduce the inclination angle of the pumping system, thereby improving the material absorption of the pumping system. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned pumping system, so it will not be repeated here.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pumping system, characterized in that: include: A master cylinder, comprising a multi-stage cylinder embedded in the master cylinder, wherein the piston rod of the first stage cylinder in the multi-stage cylinder is the cylinder barrel of the second stage cylinder, the piston of the second stage cylinder is arranged in the piston rod of the first stage cylinder, the rodless chamber of the first stage cylinder is connected to the rodless chamber of the second stage cylinder, and the rod chamber of the first stage cylinder is connected to the rod chamber of the second stage cylinder; The locking mechanism is used to cut off or connect the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder to control the action sequence of the multi-stage oil cylinder; when the locking mechanism cuts off the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder, the piston rod of the previous oil cylinder drives the piston rod of the next oil cylinder to move simultaneously; when the locking mechanism connects the rod chamber of the previous oil cylinder and the rod chamber of the next oil cylinder, the piston rod of the next oil cylinder moves alone; The locking mechanism comprises: A first oil passage is provided through the piston and the piston rod of the preceding oil cylinder, wherein a first end of the first oil passage is connected to the rod chamber of the succeeding oil cylinder; The second oil passage and the third oil passage are respectively arranged at two ends of the cylinder barrel of the previous oil cylinder, the first ends of the second oil passage and the third oil passage can be connected to the second end of the first oil passage, and the second ends are connected to the rod chamber of the previous oil cylinder; Among them, when the first end of the second oil channel or the third oil channel is misaligned with the second end of the first oil channel, the rod chamber of the previous oil channel and the rod chamber of the subsequent oil channel are in a truncated state; when the first end of the second oil channel or the third oil channel is aligned with the second end of the first oil channel, the rod chamber of the previous oil channel and the rod chamber of the subsequent oil channel are in a connected state.

2. The pumping system according to claim 1, characterized in that The first oil passage comprises: A first oil branch passage is provided through the piston rod of the preceding oil cylinder, wherein a first end of the first oil branch passage is connected to a rod chamber of the succeeding oil cylinder; The second oil channel is arranged through the piston of the previous oil cylinder. The first end of the second oil channel is connected to the second end of the first oil channel, and the second end can be connected to the first ends of the second oil channel and the third oil channel.

3. The pumping system according to claim 2, characterized in that The first end of the first oil branch channel is located at an end of the piston rod of the previous oil cylinder away from the piston of the previous oil cylinder.

4. The pumping system according to claim 1, characterized in that The locking mechanism comprises: An oil passage, one end of which is connected to the rod chamber of the preceding oil cylinder, and the other end of which is connected to the rod chamber of the succeeding oil cylinder; A control valve is arranged in the oil passage, and the control valve is used to control the cutoff or conduction of the oil passage; Among them, when the control valve is in a closed state, the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder are in a cut-off state; when the control valve is in an open state, the rod chamber of the previous stage oil cylinder and the rod chamber of the subsequent stage oil cylinder are in a conducting state.

5. The pumping system according to claim 4, characterized in that The control valve is a solenoid valve.

6. The pumping system according to any one of claims 1 to 5, characterized in that: It also comprises a conveying cylinder, in which a concrete piston is arranged, and a piston rod of a last-stage oil cylinder in the multi-stage oil cylinder is connected with the concrete piston.

7. The pumping system according to any one of claims 1 to 5, characterized in that: The master cylinder is provided with a first oil port communicating with the rodless chamber of the master cylinder and a second oil port communicating with the rod chamber of the master cylinder.

8. The pumping system according to claim 7, characterized in that There are two master oil cylinders, and the pumping system further includes a first conversion valve for connecting or disconnecting the first oil ports of the two master oil cylinders and a second conversion valve for connecting or disconnecting the second oil ports of the two master oil cylinders.

9. A pumping machine, comprising a vehicle body and a pumping system arranged on the vehicle body, characterized in that: The pumping system is the pumping system according to any one of claims 1-8.

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