Mechanical force-position hybrid controller

Abstract

The utility model discloses a kind of mechanical force position comprehensive controllers, belong to tractor lifting control technical field, including base body, one-way valve is installed in base body, one-way valve includes first valve seat, first valve core and first spring, one-way valve further includes sealing block, first valve seat and sealing block are formed with first hydraulic oil channel in common, the surface of first valve core and sealing block is provided with conical bevel, when first valve core is extruded together with first valve seat under the action of first spring, the conical bevel of first valve core cooperates with the conical bevel of sealing block and forms line seal to make first hydraulic oil channel closed, first sealing ring and first check ring are provided between the outer wall of sealing block and base body, the valve core of one-way valve and sealing block are extruded together under the action of spring force, form tight line seal, and sealing ring is arranged at the gap of sealing block to seal, sealing performance is good, to improve the sealing strength of hydraulic oil, effectively slow down the static settlement speed of plow in the state of rising.

Description

Technical Field

[0001] This utility model belongs to the field of tractor lifting control technology, specifically relating to a mechanical force and position integrated controller. Background Technology

[0002] The mechanical force-position integrated controller is used to control the pull force and tillage depth of the plow attachment attached to the rear of the tractor. This controller can work in conjunction with the tractor's force feedback and position feedback devices to control the plow pull force and tillage depth. When the plow pull force is set to a fixed value, if the pull force suddenly increases or decreases, the plow, through the force feedback device, converts the increased or decreased pull force into a displacement signal and transmits the displacement action of the displacement signal to the main valve stem of the mechanical force-position integrated controller. The displacement action of the main valve stem causes oil flow, which is then converted into the rise or fall of the plow, thereby reducing or increasing the plow pull force to maintain a constant pull force. When the plow depth position is set to a fixed value, if the plow depth position rises or falls, the plow, through the position feedback device, converts the rise or fall distance into a displacement signal and transmits the displacement action of the displacement signal to the main valve stem of the mechanical force-position integrated controller. The displacement action of the main valve stem causes oil flow, which is then converted into the fall or rise of the plow, thereby maintaining the plow at the set tillage depth.

[0003] To control the flow of hydraulic fluid, the mechanical force-position integrated controller is equipped with multiple valves for controlling the flow rate and direction of the hydraulic oil, such as... Figure 1 As shown, a typical plow assembly includes a pressure relief valve 1, an overflow valve 2, a directional valve 3, a check valve 4, and a normally closed directional valve 5. Each valve operates based on external signals, controlling the flow of hydraulic oil to raise and lower the plow. The check valve 4 uses a gap seal, and the normally closed directional valve 5 typically uses a cylindrical seal. Both of these sealing methods have poor sealing performance and low sealing strength for the hydraulic oil. The plow's static settling speed is relatively fast when raised, requiring the controller to frequently adjust the corresponding valves to raise the plow, affecting the tillage depth and the lifespan of the controller. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a mechanical force position integrated controller that addresses the shortcomings of the existing technology. The hydraulic oil has high sealing strength and effectively slows down the static settling speed of the plow in the raised state.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A mechanical force-position integrated controller includes a base, in which a one-way valve is installed. The one-way valve includes a first valve seat, a first valve core, and a first spring. The one-way valve also includes a sealing block. A first hydraulic oil passage is formed in the first valve seat and the sealing block. The surfaces of the first valve core and the sealing block are both provided with tapered inclined surfaces. When the first valve core is pressed together with the first valve seat under the action of the first spring, the tapered inclined surface of the first valve core and the tapered inclined surface of the sealing block cooperate to form a line seal, thereby closing the first hydraulic oil passage. A first sealing ring and a first retaining ring are provided between the outer wall of the sealing block and the base.

[0007] Furthermore, the base is provided with an oil inlet, one end of which is connected to the outside and the other end is connected to one end of the first hydraulic oil passage. The first valve seat is provided with an oil outlet that is connected to the other end of the first hydraulic oil passage.

[0008] Furthermore, a second sealing ring and a second retaining ring are provided between the outer wall of the first valve seat and the base.

[0009] Furthermore, one end of the one-way valve is sealed and fixed in the base body by a sealing plug, and a third sealing ring is provided between the sealing plug and the base body.

[0010] Furthermore, a screw plug is provided at the other end of the one-way valve, which tightly presses the one-way valve into the base body.

[0011] Furthermore, a normally closed directional valve is installed in the base body. A second hydraulic oil passage is formed in the second valve seat of the normally closed directional valve. A first oil port and a second oil port are provided on the base body to connect the second hydraulic oil passage with the outside. The surfaces of the second valve seat and the second valve core of the normally closed directional valve are provided with conical slopes. When the second valve core is pressed together with the second valve seat under the action of the second spring, the conical slope of the second valve core and the conical slope of the second valve seat cooperate to form a line seal, thereby sealing the second hydraulic oil passage with the first oil port.

[0012] Furthermore, a connecting oil passage is provided in the base body. One end of the connecting oil passage is connected to the second hydraulic oil passage, and the other end is connected to the oil outlet of the one-way valve. The connecting oil passage is connected to the second oil port through the second hydraulic oil passage.

[0013] Furthermore, a fourth sealing ring and a fourth retaining ring are provided between the outer wall of the second valve seat and the base, and a fifth sealing ring and a fifth retaining ring are provided between the outer wall of the second valve core and the second valve seat.

[0014] Furthermore, the base is also provided with a transmission rod for transmitting displacement and force. A spring stop is fixedly connected to one end of the second valve core near the transmission rod. The second spring is fitted on the outside of the spring stop and one end of the second valve core. The end of the second spring away from the transmission rod abuts against a spring baffle, which is fitted on the outside of the second valve core.

[0015] Furthermore, a cover plate is provided at the end of the second valve seat away from the transmission rod. The cover plate tightly presses the normally closed directional valve into the base body, and a through hole is provided at the position of the cover plate opposite to the first oil port.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are:

[0017] In the mechanical force-position integrated controller disclosed in this utility model, the valve core and sealing block of the one-way valve and the valve core and valve seat of the normally closed directional valve are both sealed by the contact of conical inclined surfaces. The contact is squeezed together under the action of spring force to form a tight line seal with good sealing performance, thereby improving the sealing strength of the hydraulic oil and effectively slowing down the static settling speed of the plow in the raised state.

[0018] In this invention, sealing rings are installed at any gap contact points of the check valve and the normally closed directional valve to prevent hydraulic oil leakage, achieve more effective sealing, and further improve sealing strength. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a mechanical force-position integrated controller in existing technology;

[0020] Figure 2 This is a schematic diagram of the external structure of the mechanical force and position integrated controller of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of a one-way valve;

[0022] Figure 4 This is a schematic diagram of the internal structure of a normally closed directional valve;

[0023] Figure 5 This is a schematic diagram showing the state of the check valve being closed and the normally closed directional valve being open.

[0024] Figure 6 This is a schematic diagram showing the state where both the check valve and the normally closed directional valve are closed.

[0025] In the diagram, in the prior art, 1-pressure relief valve, 2-overflow valve, 3-directional valve, 4-check valve, 5-normally closed directional valve.

[0026] In this application, 1-base, 2-check valve, 21-first valve seat, 22-first valve core, 22a-conical inclined surface, 23-first spring, 24-sealing block, 24a-conical inclined surface, 25-first hydraulic oil passage, 26-oil inlet, 27-oil outlet, 28-first sealing ring, 29-first retaining ring, 30-second sealing ring, 31-second retaining ring, 32-sealing plug, 33-third sealing ring, 34-screw plug, 4-normally closed directional valve, 41-second valve Seat, 41a-conical inclined surface, 42-second valve core, 42a-conical inclined surface, 44-second spring, 45-second hydraulic oil passage, 46-first oil port, 47-second oil port, 48-connecting oil passage, 49-fourth sealing ring, 50-fourth retaining ring, 51-fifth sealing ring, 52-fifth retaining ring, 53-long screw, 54-spring stop block, 55-spring baffle, 56-bore, 61-main valve stem, 62-transmission rod, 63-cover plate, 64-through hole. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0028] like Figure 2 and Figure 3 As shown in the figure, a mechanical force position integrated controller includes a base 1, in which a first mounting hole is provided. A one-way valve 2 is installed in the first mounting hole. The one-way valve 2 includes a first valve seat 21, a first valve core 22 and a first spring 23. The one-way valve 2 also includes a sealing block 24. A first hydraulic oil passage 25 is formed in the first valve seat 21 and the sealing block 24. The surfaces of the first valve core 22 and the sealing block 24 are provided with conical inclined surfaces (22a, 24a).

[0029] like Figure 5 and Figure 6 As shown, when the first valve core 22 is pressed together with the first valve seat 21 under the action of the first spring 23, the conical inclined surface 22a of the first valve core 22 and the conical inclined surface 24a of the sealing block 24 cooperate to form a line seal, thus closing the first hydraulic oil passage 25. Simultaneously, a first sealing ring 28 and a first retaining ring 29 are provided between the outer wall of the sealing block 24 and the base 1, ensuring good sealing performance when the one-way valve 2 is in the closed state. When the plow is in... Figure 6 In the working state shown, due to the good sealing effect of the one-way valve 2, the static settling speed of the plow in the raised state is relatively slow.

[0030] like Figure 3As shown, the base 1 has an oil inlet 26, one end of which is connected to the outside and the other end is connected to one end of the hydraulic oil passage. The first valve seat 21 is provided with an oil outlet 27 that is connected to the other end of the first hydraulic oil passage 25. The oil inlet 26 is used to connect to the directional valve (via... Figure 1 (a) Figure 3 The one-way valve 2 shown is in the open state. At this time, the oil pressure on the inlet 26 side is higher than the spring force of the first spring 23. After the one-way valve 2 is open, the lifting oil circuit is opened, that is, the hydraulic oil flowing out through the reversing valve flows in through the inlet 26, flows through the first hydraulic oil passage 25 and the outlet 27 into other structures in the controller, and then flows out to supply oil to the lifting cylinder to raise the plow. When the oil pressure on the inlet 26 side is lower than the spring force of the first spring 23, the one-way valve 2 closes, the lifting oil circuit is closed, such as... Figure 5 and Figure 6 As shown in the image.

[0031] Preferably, a second sealing ring 30 and a second retaining ring 31 are provided between the outer wall of the first valve seat 21 and the base 1. The sealing ring can prevent hydraulic oil leakage, achieve more effective sealing, and further improve the sealing strength. The retaining ring can protect the sealing ring, prevent the sealing ring from entering the gap between the two components, and ensure the sealing effect of the sealing ring. In this application, all sealing rings are O-rings.

[0032] In this application, one end of the one-way valve 2 is sealed and fixed inside the base 1 by a sealing plug 32, and a third sealing ring 33 is provided between the sealing plug 32 and the base 1. The other end of the one-way valve 2 is provided with a screw plug 34, which tightly presses the one-way valve 2 into the base 1.

[0033] like Figure 4 As shown, a second mounting hole is provided in the base 1, and a normally closed directional valve 4 is installed in the second mounting hole. A second hydraulic oil passage 45 is formed in the second valve seat 41 of the normally closed directional valve 4. A first oil port 46 and a second oil port 47 are provided on the base 1 to connect the second hydraulic oil passage 45 with the outside. The surfaces of the second valve seat 41 and the second valve core 42 of the normally closed directional valve 4 are provided with conical inclined surfaces (41a, 42a). Among them, the first oil port 46 is used to connect to the oil tank (through... Figure 1 The second oil port 47 is used to connect to the lifting cylinder (via T4). Figure 1 (A)

[0034] Figure 4In the normally closed directional valve 4, the second valve core 42 is in the left position. That is, when the second valve core 42 is pressed together with the second valve seat 41 under the action of the second spring 44, the tapered inclined surface 42a of the second valve core 42 and the tapered inclined surface 41a of the second valve seat 41 cooperate to form a line seal, thus sealing the second hydraulic oil passage 45 and the first oil port 46. When the normally closed directional valve 4 is in the closed state, the normally closed directional valve 4 adopts a line seal sealing method, which has better sealing performance than the normally closed directional valves that use cylindrical seals in the prior art.

[0035] A connecting oil passage 48 is provided inside the base 1. One end of the connecting oil passage 48 is connected to the second hydraulic oil passage 45, and the other end is connected to the oil outlet 27 of the one-way valve 2. The connecting oil passage 48 is connected to the second oil port 47 through the second hydraulic oil passage 45. During the lifting process of the plow, the lifting oil circuit is open, the one-way valve 2 is in the open state, the normally closed directional valve 4 is in the closed state, and its second valve core 42 is in the left position, which seals the second hydraulic oil passage 45 and the first oil port 46. The hydraulic oil is supplied to the lifting cylinder through "oil inlet 26-first hydraulic oil passage 25-connecting oil passage 48-second hydraulic oil passage 45-second oil port 47".

[0036] like Figure 5 As shown, when the plow is in the lowering state, the lowering oil circuit is open, the one-way valve 2 is closed, the normally closed directional valve 4 is open, its second valve core 42 is in the right position, the second hydraulic oil passage 45 is connected to the first oil port 46, and the hydraulic oil in the lifting cylinder flows to the oil tank through "second oil port 47-second hydraulic oil passage 45-first oil port 46".

[0037] like Figure 6 As shown, when the plow is in the raised state, the lifting height remains unchanged, and both the rising and falling oil circuits are closed. At this time, the one-way valve 2 is closed, the normally closed directional valve 4 is closed, and its second valve core 42 is in the left position, sealing the second hydraulic oil passage 45 with the first oil port 46. Due to the good sealing effect of the one-way valve 2 and the normally closed directional valve 4, the static settling speed of the plow in the raised state is effectively slowed down.

[0038] Preferably, a fourth sealing ring 49 and a fourth retaining ring 50 are provided between the outer wall of the second valve seat 41 and the base 1. Two sets of the fourth sealing ring 49 and the fourth retaining ring 50 can be provided, located at both ends of the second valve seat 41 respectively. A fifth sealing ring 51 and a fifth retaining ring 52 are provided between the outer wall of the second valve core 42 and the second valve seat 41, which can further improve the sealing strength of the normally closed directional valve 4.

[0039] like Figure 4As shown in this application, a third mounting hole is also provided in the base 1. A transmission rod 62 for transmitting displacement and force is provided in the third mounting hole. A spring stop 54 is fixedly connected to the end of the second valve core 42 near the transmission rod 62 by a long screw 53. A second spring 44 is fitted on the outside of the spring stop 54 and the second valve core 42. The end of the second spring 44 away from the transmission rod 62 abuts against a spring baffle 55, which is fitted on the outside of the second valve core 42. The side of the spring baffle 55 away from the transmission rod 62 abuts against the boss 56 of the second valve seat 41 and the second valve core 42.

[0040] The normally closed directional valve 4 opens and closes via a transmission rod 62 and a second spring 44. Specifically, when the main valve stem 61 of the mechanical force-position integrated controller is subjected to external force, the corresponding displacement and force are transmitted to the transmission rod 62 (as shown in the image). Figure 2 As shown, the main valve stem 61 and the transmission rod 62 are connected by a common transmission mechanism (the specific structure is not described in detail here). The transmission rod 62 pushes the second valve core 42 towards the first oil port 46 via the spring stop 54. At this time, the second spring 44 is compressed by the spring stop 55, and the first oil port 46 and the second oil port 47 are connected. The hydraulic oil of the lifting cylinder can flow out through this oil passage, realizing the descent of the plow. When the transmission rod 62 is not subjected to external force, the second spring 44 returns to its original state. Its elasticity causes the second valve core 42 to move away from the first oil port 46. Finally, under the action of the second spring 44, it is pressed together with the second valve seat 41, and a seal is achieved between the second hydraulic oil passage 45 and the first oil port 46.

[0041] Furthermore, a cover plate 63 is provided at the end of the second valve seat 41 away from the transmission rod 62. The cover plate 63 tightly presses the normally closed directional valve 4 into the base 1. A through hole 64 is provided at the position of the cover plate 63 opposite to the first oil port 46 to facilitate the flow of hydraulic oil.

[0042] When installing the normally closed directional valve 4, the assembled normally closed directional valve 4 is placed into the second mounting hole. The end face of the normally closed directional valve 4 is slightly higher than the end face of the base 1 during installation by controlling the machining tolerance of the hole depth of the base 1 and the length of the second valve seat 41. Then, the normally closed directional valve 4 is sealed with a cover plate 63 and screws. This installation method is convenient, quick and strong and durable.

[0043] In the mechanical force position integrated controller of this utility model, both the one-way valve and the normally closed directional valve adopt line sealing. Their contact surfaces are squeezed together under the action of spring force to form a tight line seal, and sealing rings are set at the gaps, resulting in good sealing performance. This improves the sealing strength of the hydraulic oil and effectively slows down the static settling speed of the plow in the raised state.

[0044] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0045] In the description of this specification, unless otherwise expressly defined, the terms "setup", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0046] While specific embodiments of this utility model have been described above, those skilled in the art should understand that the described embodiments are merely some, not all, embodiments of this utility model. These are merely illustrative examples, and the scope of protection of this utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model and without any inventive effort, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A mechanical force and position integrated controller, comprising a base, wherein a one-way valve is installed within the base, the one-way valve comprising a first valve seat, a first valve core, and a first spring, characterized in that, The one-way valve also includes a sealing block. A first hydraulic oil passage is formed together in the first valve seat and the sealing block. The surfaces of the first valve core and the sealing block are provided with tapered inclined surfaces. When the first valve core is pressed together with the first valve seat under the action of the first spring, the tapered inclined surface of the first valve core and the tapered inclined surface of the sealing block cooperate to form a line seal to close the first hydraulic oil passage. A first sealing ring and a first retaining ring are provided between the outer wall of the sealing block and the base.

2. The mechanical force and position integrated controller according to claim 1, characterized in that, The base has an oil inlet, one end of which is connected to the outside and the other end is connected to one end of the first hydraulic oil passage. The first valve seat has an oil outlet that is connected to the other end of the first hydraulic oil passage.

3. The integrated mechanical force and position controller according to claim 2, characterized in that, A second sealing ring and a second retaining ring are provided between the outer wall of the first valve seat and the base.

4. The integrated mechanical force and position controller according to claim 2, characterized in that, One end of the one-way valve is sealed and fixed in the base body by a sealing plug, and a third sealing ring is provided between the sealing plug and the base body.

5. The mechanical force and position integrated controller according to claim 4, characterized in that, The other end of the one-way valve is provided with a screw plug, which tightly presses the one-way valve into the base body.

6. The integrated mechanical force and position controller according to any one of claims 2 to 5, characterized in that, A normally closed directional valve is installed in the base body. A second hydraulic oil passage is formed in the second valve seat of the normally closed directional valve. A first oil port and a second oil port are opened on the base body to connect the second hydraulic oil passage with the outside. The surfaces of the second valve seat and the second valve core of the normally closed directional valve are provided with conical slopes. When the second valve core is pressed together with the second valve seat under the action of the second spring, the conical slope of the second valve core and the conical slope of the second valve seat cooperate to form a line seal, thereby sealing the second hydraulic oil passage with the first oil port.

7. The mechanical force and position integrated controller according to claim 6, characterized in that, The base body has a connecting oil passage, one end of which is connected to the second hydraulic oil passage and the other end is connected to the oil outlet of the one-way valve. The connecting oil passage is connected to the second oil port through the second hydraulic oil passage.

8. The mechanical force and position integrated controller according to claim 6, characterized in that, A fourth sealing ring and a fourth retaining ring are provided between the outer wall of the second valve seat and the base body, and a fifth sealing ring and a fifth retaining ring are provided between the outer wall of the second valve core and the second valve seat.

9. The mechanical force and position integrated controller according to claim 6, characterized in that, The base is also provided with a transmission rod for transmitting displacement and force. A spring stop is fixedly connected to one end of the second valve core near the transmission rod. The second spring is fitted on the outside of the spring stop and one end of the second valve core. The end of the second spring away from the transmission rod abuts against a spring baffle, which is fitted on the outside of the second valve core.

10. The mechanical force and position integrated controller according to claim 9, characterized in that, The second valve seat is provided with a cover plate at the end away from the transmission rod. The cover plate tightly presses the normally closed directional valve into the base body. A through hole is provided on the cover plate at the position opposite to the first oil port.

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