Weighing hydraulic system

Abstract

The utility model discloses a weighing hydraulic system, which comprises a weighing platform, a hydraulic cylinder, a throttle valve, a reversing valve group and an energy storage pressure device, and is characterized in that the weighing platform is provided with a weighing working surface; the hydraulic cylinder is fixedly arranged on one side, deviating from the weighing working surface, of the weighing platform; the throttle valve is arranged on one side, deviating from the weighing platform, of the hydraulic cylinder and is communicated with the hydraulic cylinder; the reversing valve set is arranged on the side, away from the hydraulic cylinder, of the throttling valve and communicates with the throttling valve. The energy storage pressure device is arranged on the side, away from the throttling valve, of the reversing valve set and communicates with the reversing valve set. The utility model provides a weighing hydraulic system which solves the problem that an existing weighing platform is uneven in stress.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic weighing, in particular to a weighing hydraulic system. Background Art

[0002] Weighing equipment is widely used in industries such as cement, building materials, agriculture, mining, docks, logistics, etc. The existing vehicle weighing platform has a relatively simple structure, usually including a weighing platform and a pressure sensor disposed at the bottom of the weighing platform.

[0003] Since the weighing platform is supported at multiple points and is almost entirely rigid, an important problem faced by the weighing platform during the weighing process is uneven force. Due to the uneven distribution of gravity transmitted by the measured object, the entire weighing platform cannot rise or fall synchronously, causing the weighing platform to bend and deform, resulting in errors in the weighing results; in addition, this deformation will cause irreversible damage to the sensors and other related components on the platform, and even cause the weighing platform to tip over, causing significant economic losses, thereby affecting its service life. Utility Model Content

[0004] The main purpose of the utility model is to provide a weighing hydraulic system, aiming to solve the problem of uneven force on the existing weighing platform.

[0005] In order to achieve the above-mentioned purpose, the weighing hydraulic system proposed in the utility model comprises:

[0006] A weighing platform having a weighing working surface;

[0007] A hydraulic cylinder is fixedly arranged on a side of the weighing platform away from the weighing working surface;

[0008] A throttle valve is arranged on a side of the hydraulic cylinder away from the weighing platform and is in communication with the hydraulic cylinder;

[0009] a reversing valve group, which is arranged on a side of the throttle valve away from the hydraulic cylinder and is in communication with the throttle valve; and

[0010] The energy storage pressure device is arranged on a side of the reversing valve group away from the throttle valve and is communicated with the reversing valve group.

[0011] Optionally, in an embodiment of the utility model, the hydraulic cylinder and the throttle valve are provided in plurality, and each of the hydraulic cylinders is connected to a throttle valve.

[0012] Optionally, in an embodiment of the utility model, the weighing hydraulic system further comprises a flow control valve group, and the flow control valve group is arranged between the reversing valve group and the energy storage pressure device to connect the reversing valve group and the energy storage pressure device.

[0013] Optionally, in an embodiment of the present utility model, the reversing valve group includes:

[0014] A hydraulically controlled one-way valve is provided with a first oil port and a second oil port, wherein the first oil port and the second oil port are respectively connected to the flow control valve group and the throttle valve; and

[0015] The electromagnetic reversing valve is connected to the hydraulically controlled one-way valve and is used to adjust the flow direction of the oil circuit in the hydraulically controlled one-way valve.

[0016] Optionally, in an embodiment of the present utility model, the energy storage pressure device includes:

[0017] An accumulator, the electromagnetic reversing valve and the flow control valve group are both connected to the accumulator; and

[0018] The pressure control valve is connected to one side of the accumulator and is used to control the conduction or cutoff of the oil circuits between the electromagnetic reversing valve and the flow control valve group and the accumulator respectively.

[0019] Optionally, in an embodiment of the utility model, the energy storage pressure device further includes a relief valve, and the relief valve is arranged on one side of the pressure control valve and is connected to the accumulator.

[0020] Optionally, in one embodiment of the utility model, the energy storage pressure device also includes a pressure gauge, which is fixedly installed in the oil circuit between the overflow valve and the accumulator or fixedly installed on the accumulator to detect the pressure of the liquid in the accumulator.

[0021] Optionally, in an embodiment of the utility model, the energy storage pressure device further includes an oil drain valve, which is arranged on one side of the overflow valve and is connected to the accumulator.

[0022] Optionally, in an embodiment of the utility model, the weighing hydraulic system further includes a hydraulic pump, which is disposed on one side of the weighing platform and connected to the hydraulic cylinder.

[0023] Optionally, in an embodiment of the utility model, the weighing hydraulic system further includes an oil tank, the oil tank is disposed on one side of the weighing platform and is used to contain hydraulic oil, and the oil tank is connected to the oil inlet of the hydraulic pump.

[0024] Compared with the prior art, in a technical solution provided by the utility model, during the weighing operation, the object to be measured is placed on the weighing working surface of the weighing platform, the part of the weighing platform under pressure will drop under the action of gravity, and the hydraulic cylinder placed under the weighing platform will drop synchronously. When the hydraulic cylinder drops, the hydraulic oil in the hydraulic system circuit will be stored in the energy storage pressure device. In addition, a throttle valve connected to the hydraulic cylinder is also provided in the present solution, and the energy storage pressure device can also balance the impact caused by gravity and protect the normal use of the derivative parts of the entire weighing platform. By adjusting the flow of the hydraulic cylinder oil circuit by the throttle valve, the gravity received by the entire weighing platform during the weighing process is evenly distributed, solving the problem that the weighing platform is deformed due to the excessive local gravity. When the weighing is completed, the reversing valve group will change the flow direction of the oil circuit in the entire hydraulic system, and the oil stored in the energy storage pressure device will provide hydraulic oil to the hydraulic system when the hydraulic cylinder rises, so that the weighing platform and the hydraulic cylinder rise and reset synchronously. In this solution, the hydraulic cylinder is used to assist in supporting the weighing platform and to withstand the local impact caused by gravity during the weighing operation, thereby further maintaining the stability of the overall structure of the weighing platform and the orderly progress of the weighing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the weighing hydraulic system of the utility model;

[0027] Figure 2 This is a structural schematic diagram of a reversing valve group in an embodiment of a weighing hydraulic system of the utility model;

[0028] Figure 3 This is a structural schematic diagram of a flow control valve group in an embodiment of a weighing hydraulic system of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the energy storage pressure device in one embodiment of the weighing hydraulic system of the utility model.

[0030] Description of Figure Numbers:

[0031] Label name Label name 1 Hydraulic Cylinders 41 Accumulator 2 Throttle valve 43 Pressure Control Valve 3 Directional valve group 45 Relief valve 31 Hydraulic control check valve 47 Pressure gauge 32 Solenoid reversing valve 49 Oil drain valve 4 Accumulator pressure device 5 Flow Control Valve Group

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] Since the weighing platform is supported at multiple points and is almost entirely rigid, an important problem faced by the weighing platform during the weighing process is uneven force. Due to the uneven distribution of gravity transmitted by the measured object, the entire weighing platform cannot rise or fall synchronously, causing the weighing platform to bend and deform, resulting in errors in the weighing results; in addition, this deformation will cause irreversible damage to the sensors and other related components on the platform, and even cause the weighing platform to tip over, causing significant economic losses, thereby affecting its service life.

[0038] Based on this, the utility model proposes a weighing hydraulic system, in which a hydraulic cylinder is provided at the bottom of the weighing platform, and a throttle valve is provided at the oil outlet of the hydraulic cylinder. The throttle valve adjusts the oil flow of the hydraulic cylinder so that the gravity exerted on the entire weighing platform during the weighing process is evenly distributed, thereby solving the problem of deformation of the weighing platform due to excessive local gravity.

[0039] like Figure 1 - Figure 4 As shown, the weighing hydraulic system includes:

[0040] A weighing platform having a weighing working surface;

[0041] The hydraulic cylinder 1 is fixedly arranged on the side of the weighing platform away from the weighing working surface;

[0042] The throttle valve 2 is arranged on the side of the hydraulic cylinder 1 away from the weighing platform and is connected with the hydraulic cylinder 1;

[0043] The reversing valve group 3 is arranged on the side of the throttle valve 2 away from the hydraulic cylinder 1 and is connected with the throttle valve 2; and

[0044] The energy storage pressure device 4 is arranged on a side of the reversing valve group 3 away from the throttle valve 2 and is communicated with the reversing valve group 3 .

[0045] In the technical solution adopted in this embodiment, during the weighing operation, the object to be measured is placed on the weighing working surface of the weighing platform, and the part of the weighing platform under pressure will drop under the action of gravity, and the hydraulic cylinder 1 placed under the weighing platform will drop synchronously. When the hydraulic cylinder 1 drops, the hydraulic oil in the hydraulic system circuit will be stored in the energy storage pressure device 4. In addition, a throttle valve 2 connected to the hydraulic cylinder 1 is also provided in this solution, and the energy storage pressure device 4 can also balance the impact caused by gravity and protect the normal use of the derivative parts of the entire weighing platform. Through the adjustment of the flow rate of the hydraulic cylinder 1 oil circuit by the throttle valve 2, the gravity received by the entire weighing platform during the weighing process is evenly distributed, and the situation that the weighing platform is deformed due to the excessive local gravity is solved. When the weighing is completed, the reversing valve group 3 will change the flow direction of the oil circuit in the entire hydraulic system, and the oil stored in the energy storage pressure device 4 will provide hydraulic oil to the hydraulic system when the hydraulic cylinder 1 rises, so that the weighing platform and the hydraulic cylinder 1 rise and reset synchronously. In this solution, the hydraulic cylinder 1 is used to assist in supporting the weighing platform and to withstand the local impact caused by gravity during the weighing operation, thereby further maintaining the stability of the overall structure of the weighing platform and the orderly progress of the weighing operation.

[0046] Specifically, there is no specific limit on the number of hydraulic cylinders 1 and throttle valves 2, which can be set according to the size and shape of the weighing platform. It should be noted that the throttle valve 2 can be a one-way valve to ensure that the oil circuit inside the throttle valve 2 flows in one direction when the weighing platform rises or falls. There is no specific limit on the structure of the reversing valve group 3, as long as it can play a role in changing the direction of the oil circuit in the hydraulic system.

[0047] Please refer to Figure 1 and Figure 2As shown, the specific working principle is: when the weighing hydraulic system is used, the unloaded weight of the weighing platform itself is equal to the preset pressure value in the energy storage pressure device 4. According to Newton's first law, the system is in the initial state of two-force balance at this time. When the weighing operation starts, when the downward gravity of the platform plus the weight of the platform itself is greater than the preset pressure value in the energy storage pressure device 4, the hydraulic cylinder 1 starts to move downward, and the hydraulic oil enters the energy storage pressure device 4 in the direction of A→B through the throttle valve 2 and the reversing valve group 3 in sequence. When the weighing operation is completed, that is, when the hydraulic cylinder 1 reaches the lower limit of the stroke, the reversing valve group 3 that receives the signal changes the control direction, that is, from B→A. When the weighed object moves away from the weighing platform, due to the reduction of gravity, the energy storage pressure device 4 begins to output the hydraulic oil in the reverse direction under the influence of the preset pressure, and flows back to the hydraulic cylinder 1 through the direction of B→A in the reversing valve group 3 and the throttle valve 2. When the object being weighed is completely removed from the weighing platform, the hydraulic cylinder 1 reaches the upper limit of the stroke, and the reversing valve group 3 that receives the signal returns to the initial state position, so that the control direction in the reversing valve group 3 is restored, that is, from A to B. At this time, the unloaded weight of the weighing platform itself is equal to the preset pressure value again, and the initial state of the two forces being balanced is restored.

[0048] Alternatively, if Figure 1 As shown, in one embodiment of the utility model, a plurality of hydraulic cylinders 1 and throttle valves 2 are respectively provided, and the plurality of hydraulic cylinders 1 are evenly spaced along the side of the weighing platform away from the weighing working surface to buffer and evenly distribute the gravity exerted on the weighing platform. Furthermore, each hydraulic cylinder 1 is respectively connected to a corresponding throttle valve 2, so as to individually adjust the flow of hydraulic oil in each hydraulic cylinder 1 to ensure even distribution of gravity at various parts of the weighing platform.

[0049] Alternatively, if Figure 1 and Figure 3 As shown, in one embodiment of the utility model, the weighing hydraulic system further includes a flow control valve group 5, which is arranged between the reversing valve group 3 and the energy storage pressure device 4 to connect the reversing valve group 3 and the energy storage pressure device 4. The flow control valve group 5 can control the uniform distribution of the hydraulic oil flow of the hydraulic cylinder 1 during the ascending process as a whole, thereby further ensuring that the weighing platform is stably reset when the weighing object leaves. Preferably, the flow control valve group 5 includes at least two flow valves arranged in parallel at intervals, and the flow size of the oil circuit is adjusted by the switch in the flow valve.

[0050] Alternatively, if Figure 2 As shown, in one embodiment of the utility model, the reversing valve group 3 includes:

[0051] The hydraulically controlled one-way valve 31 is provided with a first oil port and a second oil port, and the first oil port and the second oil port are respectively connected to the flow control valve group 5 and the throttle valve 2; and

[0052] The electromagnetic reversing valve 32 is connected to the hydraulically controlled one-way valve 31 and is used to adjust the flow direction of the oil circuit in the hydraulically controlled one-way valve 31 .

[0053] Specifically, the reversing valve group 3 includes a hydraulically controlled one-way valve 31 and an electromagnetic reversing valve 32, and the electromagnetic reversing valve 32 can be used to change the flow direction of the oil circuit in the hydraulically controlled one-way valve 31. For example, when the hydraulic cylinder 1 moves downward, the hydraulic oil will enter the energy storage pressure device 4 in the A→B direction through the throttle valve 2 and the hydraulically controlled one-way valve 31 in sequence. When the hydraulic cylinder 1 reaches the lower limit of the stroke, the electromagnetic reversing valve 32 that receives the signal is energized. At this time, the valve core of the electromagnetic reversing valve 32 begins to reverse, and the hydraulic oil is transported to the control oil port X of the hydraulically controlled one-way valve 31 through the P→A oil circuit, thereby causing the hydraulically controlled one-way valve 31 to change the control direction, that is, from B→A. When the object to be weighed moves away from the weighing platform, the hydraulic oil begins to output in the reverse direction, and enters the hydraulic cylinder 1 through the B→A direction of the hydraulically controlled one-way valve 31 and the throttle valve 2. When the object to be weighed is completely removed from the weighing platform, the hydraulic cylinder 1 reaches the upper limit of the stroke. At this time, the electromagnetic reversing valve 32 that receives the signal stops receiving power, and the valve core of the electromagnetic reversing valve 32 returns to the middle position, so that the hydraulic oil cannot be delivered to the control oil port X of the hydraulic control one-way valve 31 through the P→A oil circuit, thereby restoring the control direction of the hydraulic control one-way valve 31, that is, from A→B.

[0054] Alternatively, if Figure 4 As shown, in one embodiment of the present utility model, the energy storage pressure device 4 includes:

[0055] The accumulator 41, the electromagnetic reversing valve 32 and the flow control valve group 5 are all connected to the accumulator 41; and

[0056] The pressure control valve 43 is connected to one side of the accumulator 41 and is used to control the conduction or cutoff of the oil circuits between the electromagnetic reversing valve 32 and the flow control valve group 5 and the accumulator 41 respectively.

[0057] Specifically, the accumulator 41 can store the hydraulic oil of the hydraulic system circuit when the hydraulic cylinder 1 descends, and can provide hydraulic oil to the hydraulic system when the hydraulic cylinder 1 rises. The accumulator 41 itself has a preset pressure P, whose value is equal to the weight of the weighing platform when it is unloaded, thereby ensuring that the hydraulic cylinder 1 will not descend automatically when the weighing platform is unloaded, and can stabilize the pressure of the hydraulic system during the weighing operation. After the weighing operation is completed, the hydraulic cylinder 1 rises, so that the weighing platform returns to the initial position. The setting of the pressure control valve 43 can open or close the connection between the accumulator pressure device 4 and the hydraulic system.

[0058] Alternatively, if Figure 4As shown, in one embodiment of the utility model, the energy storage pressure device 4 also includes a relief valve 45, which is arranged on one side of the pressure control valve 43 and is connected to the accumulator 41. The relief valve 45 is arranged on the oil path extending from the accumulator 41. When the pressure in the hydraulic system increases, the relief valve 45 opens to allow excess flow to flow out, thereby ensuring that the inlet pressure of the accumulator 41 is constant, thereby playing a role in constant pressure relief, pressure stabilization, system unloading and safety protection.

[0059] Alternatively, if Figure 4 As shown, in one embodiment of the utility model, the energy storage pressure device 4 also includes a pressure gauge 47, which is fixedly arranged in the oil circuit between the relief valve 45 and the accumulator 41, and is used to detect and observe the pressure in the hydraulic system in real time; the pressure gauge 47 is fixedly arranged on the accumulator 41, and can detect the pressure of the liquid inside the accumulator 41 in real time.

[0060] Alternatively, if Figure 4 As shown, in one embodiment of the utility model, the energy storage pressure device 4 also includes an oil drain valve 49, which is arranged on one side of the overflow valve 45 and is connected to the accumulator 41. The oil drain valve 49 is connected to an external oil tank through a pipeline and is used to quickly discharge the hydraulic oil when the accumulator 41 is inspected and repaired.

[0061] Optionally, in an embodiment of the utility model, the weighing hydraulic system further includes a hydraulic pump, which is arranged on one side of the weighing platform and connected to the hydraulic cylinder 1. Further, the hydraulic pump is a gear pump. The hydraulic pump can make the hydraulic oil in the hydraulic system flow to generate pressure and power, drive the piston rod of the hydraulic cylinder 1 to reciprocate, and then make the weighing platform rise or fall.

[0062] Optionally, in one embodiment of the utility model, the weighing hydraulic system also includes an oil tank, which is arranged on one side of the weighing platform and is used to contain hydraulic oil, and the oil tank is connected to the oil inlet of the hydraulic pump to provide the hydraulic system with the hydraulic oil required to complete the weighing operation.

[0063] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A weighing hydraulic system, characterized in that: The weighing hydraulic system comprises: A weighing platform having a weighing working surface; A hydraulic cylinder is fixedly arranged on a side of the weighing platform away from the weighing working surface; A throttle valve is arranged on a side of the hydraulic cylinder away from the weighing platform and is in communication with the hydraulic cylinder; a reversing valve group, which is arranged on a side of the throttle valve away from the hydraulic cylinder and is in communication with the throttle valve; and The energy storage pressure device is arranged on a side of the reversing valve group away from the throttle valve and is communicated with the reversing valve group.

2. The weighing hydraulic system according to claim 1, characterized in that: The hydraulic cylinder and the throttle valve are provided in plurality, and each of the hydraulic cylinders is connected to a throttle valve.

3. The weighing hydraulic system according to claim 1, characterized in that: The weighing hydraulic system further comprises a flow control valve group, wherein the flow control valve group is arranged between the reversing valve group and the energy storage pressure device to connect the reversing valve group and the energy storage pressure device.

4. The weighing hydraulic system according to claim 3, characterized in that: The reversing valve group comprises: A hydraulically controlled one-way valve is provided with a first oil port and a second oil port, wherein the first oil port and the second oil port are respectively connected to the flow control valve group and the throttle valve; and The electromagnetic reversing valve is connected to the hydraulically controlled one-way valve and is used to adjust the flow direction of the oil circuit in the hydraulically controlled one-way valve.

5. The weighing hydraulic system according to claim 4, characterized in that: The energy storage pressure device comprises: An accumulator, the electromagnetic reversing valve and the flow control valve group are both connected to the accumulator; and The pressure control valve is connected to one side of the accumulator and is used to control the conduction or cutoff of the oil circuits between the electromagnetic reversing valve and the flow control valve group and the accumulator respectively.

6. The weighing hydraulic system according to claim 5, characterized in that: The energy storage pressure device further includes a relief valve, which is disposed at one side of the pressure control valve and communicated with the accumulator.

7. The weighing hydraulic system according to claim 6, characterized in that: The energy storage pressure device also includes a pressure gauge, which is fixedly arranged in the oil circuit between the relief valve and the accumulator or fixedly arranged on the accumulator to detect the pressure of the liquid in the accumulator.

8. The weighing hydraulic system according to claim 7, characterized in that: The energy storage pressure device further comprises an oil discharge valve, which is arranged at one side of the overflow valve and communicated with the accumulator.

9. The weighing hydraulic system according to any one of claims 1 to 8, characterized in that: The weighing hydraulic system also includes a hydraulic pump, which is arranged on one side of the weighing platform and connected to the hydraulic cylinder.

10. The weighing hydraulic system according to claim 9, characterized in that: The weighing hydraulic system also includes an oil tank, which is arranged on one side of the weighing platform and is used to contain hydraulic oil, and the oil tank is connected to the oil inlet of the hydraulic pump.

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