A zero-degree setting device and method for a magnetic rotor and a valve seat

Abstract

The present invention discloses a zero-degree setting device and method for a magnetic rotor and a valve seat, which includes a magnetic rotor clamping cylinder, a valve seat positioning mechanism, a rotating support seat, and a transmission docking shaft. The upper end of the transmission docking shaft is connected to the valve seat positioning mechanism, and the axis of the transmission docking shaft coincides with the rotation axis of the valve seat positioning mechanism. It also includes a lower connecting shaft and its lifting frame. The lifting frame is provided with a rotating servo drive component for driving the lower connecting shaft to rotate horizontally, and the lifting frame is adjustable in lifting. Among them, during automatic zero-degree setting, the lifting frame is raised so that the upper end of the lower connecting shaft engages with the lower end of the transmission docking shaft, causing the lower connecting shaft, the transmission docking shaft, the valve seat positioning mechanism, and its valve seat to rotate synchronously. When the valve stem is inserted into the communication port, the valve stem cannot continue to move axially, and at the same time, the magnetic rotor cannot continue to rotate relative to the valve seat. At this time, the torque sensor monitors a sudden change in the torque of the magnetic rotor clamping cylinder, thereby confirming the zero position.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic tooling, and specifically, to a zero-degree setting device and method for a magnetic rotor and a valve seat. Background Art

[0002] Nowadays, an air-conditioning system is installed in an automobile interior. An air-conditioning expansion valve is an important component in the air-conditioning system. Currently, an electric electronic expansion valve is widely used. As Figure 4 shown in one of the structural types of the electric electronic expansion valve (refer to the electronic expansion valve courseware in Baidu Library), during the assembly process, a valve stem is fixedly inserted into a magnetic rotor, and the magnetic rotor needs to be connected to the valve seat in a threaded engagement manner. The threaded engagement relationship between the magnetic rotor and the valve seat is converted into an axial telescopic movement of the valve stem. In order to place the valve stem in the initial axial position (the valve stem blocks the communication port of the valve seat), that is, a zero-degree setting operation is required, it is necessary to control the relative rotation angle between the magnetic rotor and the valve seat during the assembly process.

[0003] Therefore, the installation of the magnetic rotor and the valve seat of the air-conditioning expansion valve has always been a difficult problem. The valve stem will shake, and the coaxiality requirement is very high. The traditional assembly method is inefficient, time-consuming and laborious. There is a lack of monitoring during the process, and defective products are easily mixed into the products without being detected. It is necessary to solve the problems of the efficiency and quality control of the installation. Summary of the Invention

[0004] The purpose of the present invention is to provide a zero-degree setting device and method for a magnetic rotor and a valve seat, which can efficiently complete the zero-degree setting process of the magnetic rotor and the valve seat.

[0005] The purpose of the present invention is achieved as follows: A zero-degree setting device for a magnetic rotor and a valve seat, which is used for the automatic zero-degree setting process of the magnetic rotor and the valve seat, includes:

[0006] A magnetic rotor clamping cylinder arranged above the zero-degree setting station, and a claw for clamping the magnetic rotor is arranged at the lower part of the magnetic rotor clamping cylinder;

[0007] A valve seat positioning mechanism under the claw, and the valve seat positioning mechanism is used to lock the position of the valve seat so that the valve seat faces the magnetic rotor and its valve stem;

[0008] A fixed rotation support seat, and the rotation support seat is horizontally rotatably connected to the valve seat positioning mechanism and supports the valve seat positioning mechanism;

[0009] A vertically arranged transmission docking shaft, the upper end of the transmission docking shaft is connected to the valve seat positioning mechanism, the axis of the transmission docking shaft coincides with the rotation axis of the valve seat positioning mechanism, and the lower end of the transmission docking shaft passes through the lower side of the rotation support seat;

[0010] Lower connecting shaft and its lifting frame, the lifting frame is provided with a rotary servo drive component for driving the lower connecting shaft to rotate horizontally, and the lifting frame is arranged to be adjustable in height;

[0011] Among them, the lower end of the transmission docking shaft is set to be a structure that fits with the upper end of the lower connecting shaft, and during automatic zero adjustment, the lifting frame is raised so that the upper end of the lower connecting shaft engages with the lower end of the transmission docking shaft, causing the lower connecting shaft, the transmission docking shaft, the valve seat positioning mechanism and its valve seat to rotate synchronously.

[0012] As another aspect of the present invention, a zero adjustment method is proposed, including the following steps:

[0013] Preparation step: The jaws of the magnetic rotor clamping cylinder clamp the magnetic rotor from above, and lock the valve seat of the expansion valve on the valve seat positioning mechanism;

[0014] Engagement step: Raise the lifting frame, and the lifting frame drives the lower connecting shaft to move upward, so that the upper end of the lower connecting shaft is coaxially docked and engaged with the transmission docking shaft upward;

[0015] Adjustment step: The rotary servo drive component drives the lower connecting shaft to rotate, and the lower connecting shaft drives the transmission docking shaft to rotate synchronously, so that the valve seat positioning mechanism and the valve seat rotate together. During this process, the magnetic rotor and the valve seat rotate relatively. Using the thread fit relationship between the magnetic rotor and the valve seat, the axial position of the valve stem of the magnetic rotor is controlled, thereby realizing the zero adjustment of the valve seat and the magnetic rotor, and using the torque sensor to monitor the torque change state of the magnetic rotor clamping cylinder;

[0016] When the valve stem is inserted into the communication port, the valve stem cannot continue to move axially, and at the same time, the magnetic rotor cannot continue to rotate relative to the valve seat. At this time, the torque sensor monitors a sudden change in the torque of the magnetic rotor clamping cylinder, thereby confirming the zero position.

[0017] The beneficial effects of the present invention are as follows:

[0018] When the lower connecting shaft, the transmission docking shaft, the valve seat positioning mechanism and its valve seat rotate synchronously, the rotary servo drive motor outputs power and drives the lower connecting shaft to rotate horizontally through the synchronous belt. Since the lower connecting shaft and the transmission docking shaft are engaged with each other and can transmit torque, the lower connecting shaft, the transmission docking shaft, the valve seat positioning mechanism and its valve seat can rotate a preset angle synchronously, so that the magnetic rotor and the valve seat rotate relatively, thereby using the thread fit between the magnetic rotor and the valve seat to control the axial position of the valve stem 5, which is convenient for precise zero adjustment operation. Description of the Drawings

[0019] Figure 1 is a perspective view of the present invention.

[0020] Figure 2 is a side view of the present invention.

[0021] Figure 3 Yes Figure 2 is the A-A sectional view in

[0022] Figure 4 is a schematic sectional view of an expansion valve.

[0023] Figure 5 is an example layout diagram of the present invention. Detailed implementation manners

[0024] The following further describes the present invention in conjunction with Figures 1-5 the accompanying drawings and specific embodiments.

[0025] As Figure 4 shown, the expansion valve mentioned in this embodiment is an electric electronic expansion valve for an automotive air conditioning system, and its structure is prior art.

[0026] As Figures 1-3 shown, a zero-degree setting device for a magnetic rotor and a valve seat is proposed, which is used for the automatic zero-degree setting process of the magnetic rotor 4 and the valve seat 6 of the expansion valve, including:

[0027] A magnetic rotor clamping cylinder 3 arranged above the zero-degree setting station, and a jaw 3a for clamping the magnetic rotor 4 is provided at the lower part of the magnetic rotor clamping cylinder 3;

[0028] A valve seat positioning mechanism 7 located below the jaw 3a, and the valve seat positioning mechanism 7 is used to lock the position of the valve seat 6 so that the valve seat 6 faces the magnetic rotor 4 and its valve stem 5. The structural form of the valve seat positioning mechanism 7 is not limited and can be any positioning component;

[0029] A fixed rotary support base 71, and the rotary support base 71 is horizontally rotatably connected to the valve seat positioning mechanism 7 and supports the valve seat positioning mechanism 7;

[0030] A vertically arranged transmission docking shaft 8, the upper end of the transmission docking shaft 8 is connected to the valve seat positioning mechanism 7, the axis of the transmission docking shaft 8 coincides with the rotation axis of the valve seat positioning mechanism 7, and the lower end of the transmission docking shaft 8 passes through the lower side of the rotary support base 71;

[0031] A lower connecting shaft 9 and its lifting frame 10, the lifting frame 10 is provided with a rotary servo drive component for driving the lower connecting shaft 9 to rotate horizontally, and the lifting frame 10 is adjustable in height.

[0032] Among them, the lower end of the transmission docking shaft 8 is set to be a structure that fits with the upper end of the lower connecting shaft 9, and during automatic zero-degree setting, the lifting frame 10 is raised so that the upper end of the lower connecting shaft 9 engages with the lower end of the transmission docking shaft 8, causing the lower connecting shaft 9, the transmission docking shaft 8, the valve seat positioning mechanism 7 and its valve seat 6 to rotate synchronously.

[0033] The device further includes a lifting cylinder 1 and a torque sensor 2. The lifting cylinder 1 is arranged above the zero setting station. Both the torque sensor 2 and the magnetic rotor clamping cylinder 3 are connected to the movable part of the lifting cylinder 1. The torque sensing shaft of the torque sensor 2 is connected to the magnetic rotor clamping cylinder 3 to sense the torque change state of the magnetic rotor clamping cylinder 3.

[0034] The upper end of the above-mentioned lower connecting shaft 9 is provided with a transmission projection 9a with a trapezoidal vertical cross-section. The lower end of the transmission docking shaft 8 is provided with a trapezoidal transmission groove 8a. When the upper end of the lower connecting shaft 9 is joined with the lower end of the transmission docking shaft 8, the transmission projection 9a is inserted upward into the transmission groove 8a and fits with the transmission groove 8a.

[0035] The device further includes a fixed lower frame 15 located below the transmission docking shaft 8. The lifting frame 10 is arranged in the lower frame 15 in a liftable and adjustable manner.

[0036] In order to ensure the stability and guiding property of the lifting adjustment of the lifting frame 10, the lifting frame 10 is fixedly connected with several vertically extending guide rods 13. The lower frame 15 is fixed with several guide sleeves 14 that are respectively matched with the guide rods 13. The guide rods 13 slide up and down through the guide sleeves 14.

[0037] The device further includes a vertically arranged upper pressing cylinder 16. The cylinder barrel of the upper pressing cylinder 16 is fixedly connected to the lower frame 15. The lifting frame 10 is in lifting and movable cooperation with the lower frame 15. The piston rod of the upper pressing cylinder 16 is connected to and supports the bottom of the lifting frame 10.

[0038] The above-mentioned lower frame 15 is provided with a lifting movable hole 15a on its upper side. The lifting frame 10 is in lifting and movable cooperation with the lifting movable hole 15a of the lower frame 15.

[0039] The above-mentioned rotary servo drive component includes a rotary servo drive motor 11, a synchronous belt 12, as well as a driving wheel and a driven wheel. The synchronous belt 12 is matched with the driving wheel and the driven wheel. The rotary servo drive motor 11 is installed in the lifting frame 10. The driving wheel is sleeved on the main shaft of the rotary servo drive motor 11. The driven wheel is coaxially sleeved on the lower connecting shaft 9. The lower connecting shaft 9 is rotatably connected to the lifting frame 10.

[0040] When the lower connecting shaft 9, the transmission docking shaft 8, the valve seat positioning mechanism 7 and its valve seat 6 rotate synchronously, the rotary servo drive motor 11 outputs power and drives the lower connecting shaft 9 to rotate horizontally by itself through the synchronous belt 12. Since the lower connecting shaft 9 and the transmission docking shaft 8 are joined to each other and can transmit torque, therefore, the lower connecting shaft 9, the transmission docking shaft 8, the valve seat positioning mechanism 7 and its valve seat 6 can rotate synchronously by a preset angle, so that the magnetic rotor 4 and the valve seat 6 rotate relative to each other, thereby using the thread fit between the magnetic rotor 4 and the valve seat 6 to control the axial position of the valve rod 5, which is convenient for accurate zero adjustment operation.

[0041] Combined with Figures 1-4As shown, the method for zero-degree adjustment of the magnetic rotor 4 and the valve seat 6 is carried out according to the following steps.

[0042] Preparation steps: The claws 3a of the magnetic rotor clamping cylinder 3 clamp the magnetic rotor 4 on it (the magnetic rotor 4 is coaxially fixedly connected to the valve stem 5, which is common knowledge and will not be described in detail below), and the valve seat 6 of the expansion valve is locked on the valve seat positioning mechanism 7. The upper lifting cylinder 1 adjusts the height of the magnetic rotor 4 so that the magnetic rotor 4 pre-positions the valve seat 6, preparing for the subsequent automatic zero-degree adjustment process of the magnetic rotor 4 and the valve seat 6.

[0043] Joining steps: After clamping is completed, the upper pressure cylinder 16 pushes up the lifting frame 10, and the lifting frame 10 drives the lower connecting shaft 9 to move upward, so that the transmission protrusion 9a on the upper side of the lower connecting shaft 9 is inserted into the transmission groove 8a on the lower side of the transmission docking shaft 8, so that the lower connecting shaft 9 and the transmission docking shaft 8 are coaxially docked and matched.

[0044] Adjustment steps: Rotate the servo drive motor 11 to drive the lower connecting shaft 9 to rotate through the synchronous belt 12, and the lower connecting shaft 9 drives the transmission connecting shaft 8 to rotate synchronously, so that the valve seat positioning mechanism 7 rotates together with the valve seat 6. In this process, the valve seat positioning mechanism 7 rotates together with the valve seat 6. Figures 1-3 and Figure 4 As shown, the magnetic rotor 4 and the valve seat 6 generate relative rotation, and the threaded matching relationship between the magnetic rotor 4 and the valve seat 6 is utilized to control the axial position of the valve stem 5 of the magnetic rotor 4, thereby achieving zero-degree adjustment of the valve seat 6 and the magnetic rotor 4, and the torque sensor 2 is utilized to monitor the torque change state of the magnetic rotor clamping cylinder 3.

[0045] When the magnetic rotor 4 is screwed into the valve seat 6 to the zero position, the valve stem 5 is inserted into the connecting port, and the valve stem 5 cannot continue to move axially. At the same time, the magnetic rotor 4 cannot continue to rotate relative to the valve seat 6. At this time, the torque sensor 2 detects a sudden change in the torque of the magnetic rotor clamping cylinder 3, thereby confirming the zero position.

[0046] like Figure 5 As shown, the present embodiment is provided with three groups of the above-mentioned devices, which are arranged along a circular frame. The first group is used for flow control, with the purpose of pre-compressing the valve needle spring to make it automatically straighten and pre-tighten to find the torque critical point (to avoid external force generating additional torque value); the second group is used for zero point identification, with the purpose of finding the sudden change of the two signals of torque and flow to identify the zero point, and to precisely control it; the third group is used for valve opening flow adjustment, with the purpose of rotating a certain angle based on the zero point, preventing the valve needle component from rotating during the process, and adopting the control mode of servo motor + torque sensor to improve the detection accuracy.

[0047] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0048] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A zero-degree setting device for a magnetic rotor and a valve seat, which is used for the automatic zero-degree setting process of the magnetic rotor (4) and the valve seat (6), and is characterized in that, Including: A magnetic rotor clamping cylinder (3) arranged above the zero-degree setting station, with a jaw (3a) for clamping the magnetic rotor (4) provided at the lower part of the magnetic rotor clamping cylinder (3); A valve seat positioning mechanism (7) located below the jaw (3a), which is used to lock the position of the valve seat (6) so that the valve seat (6) is directly opposite to the magnetic rotor (4) and its valve stem (5); A fixedly arranged rotary support base (71), which horizontally rotatably connects the valve seat positioning mechanism (7) and supports the valve seat positioning mechanism (7); A vertically arranged transmission docking shaft (8), the upper end of the transmission docking shaft (8) is connected to the valve seat positioning mechanism (7), the axis of the transmission docking shaft (8) coincides with the rotation axis of the valve seat positioning mechanism (7), and the lower end of the transmission docking shaft (8) passes through the lower side of the rotary support base (71); A lower connecting shaft (9) and its lifting frame (10), the lifting frame (10) is provided with a rotary servo drive component for driving the lower connecting shaft (9) to rotate horizontally, and the lifting frame (10) is arranged to be adjustable in height; An upper lifting cylinder (1) and a torque sensor (2), the upper lifting cylinder (1) is arranged above the zero-degree setting station, both the torque sensor (2) and the magnetic rotor clamping cylinder (3) are connected to the movable part of the upper lifting cylinder (1), and the torque sensing shaft of the torque sensor (2) is connected to the magnetic rotor clamping cylinder (3) to sense the torque change state of the magnetic rotor clamping cylinder (3); Wherein, the lower end of the transmission docking shaft (8) is set to a structure that matches the upper end of the lower connecting shaft (9), and during automatic zero-degree adjustment, the lifting frame (10) is adjusted upward so that the upper end of the lower connecting shaft (9) engages with the lower end of the transmission docking shaft (8), making the lower connecting shaft (9), the transmission docking shaft (8), the valve seat positioning mechanism (7) and its valve seat (6) rotate synchronously.

2. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 1, and is characterized in that, The upper end of the lower connecting shaft (9) is set to a transmission protrusion (9a) with a trapezoidal vertical cross-section, and the lower end of the transmission docking shaft (8) is provided with a trapezoidal transmission groove (8a). When the upper end of the lower connecting shaft (9) engages with the lower end of the transmission docking shaft (8), the transmission protrusion (9a) is inserted upward into the transmission groove (8a) and fits with the transmission groove (8a).

3. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 1, and is characterized in that, It further includes a fixedly arranged lower machine frame (15) located below the transmission docking shaft (8), and the lifting frame (10) is arranged to be adjustable in height in the lower machine frame (15).

4. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 3, and is characterized in that, The lifting frame (10) is fixedly connected with a plurality of vertically extending guide rods (13), the lower machine frame (15) is fixed with a plurality of guide sleeves (14) that match the guide rods (13) one by one, and the guide rods (13) slidably penetrate through the guide sleeves (14) up and down.

5. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 3, and is characterized in that, It further includes an upper pressing cylinder (16), the cylinder barrel of the upper pressing cylinder (16) is fixedly connected to the lower machine frame (15), the lifting frame (10) is in lifting and movable cooperation with the lower machine frame (15), and the piston rod of the upper pressing cylinder (16) is connected to and supports the bottom of the lifting frame (10).

6. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 3, and is characterized in that, The lower machine frame (15) is provided with a lifting and movable hole (15a) on its upper side, and the lifting frame (10) is in lifting and movable cooperation with the lifting and movable hole (15a) of the lower machine frame (15).

7. The zero-degree setting device for a magnetic rotor and a valve seat according to claim 1, and is characterized in that, The rotary servo drive component includes a rotary servo drive motor (11) and a synchronous belt (12), as well as a driving pulley and a driven pulley. The synchronous belt (12) is engaged with the driving pulley and the driven pulley. The rotary servo drive motor (11) is installed in the lifting frame (10). The driving pulley is sleeved on the main shaft of the rotary servo drive motor (11), and the driven pulley is coaxially sleeved on the lower connecting shaft (9). The lower connecting shaft (9) is rotatably connected to the lifting frame (10).

8. A zero-degree setting method using the zero-degree setting device for a magnetic rotor and a valve seat according to claim 1, and is characterized in that, It includes the following steps: Preparation step: The clamp (3a) of the magnetic rotor clamping cylinder (3) clamps the magnetic rotor (4) from above, and locks the valve seat (6) of the expansion valve on the valve seat positioning mechanism (7). Engagement step: The lifting frame (10) is lifted, and the lifting frame (10) drives the lower connecting shaft (9) to move upward, so that the lower connecting shaft (9) moves upward to be coaxially docked and engaged with the transmission docking shaft (8). Adjustment step: The rotary servo drive component drives the lower connecting shaft (9) to rotate, and the lower connecting shaft (9) drives the transmission docking shaft (8) to rotate synchronously, so that the valve seat positioning mechanism (7) and the valve seat (6) rotate together by a preset angle. During this process, the magnetic rotor (4) and the valve seat (6) rotate relatively. Using the thread fitting relationship between the magnetic rotor (4) and the valve seat (6), the axial position of the valve stem (5) of the magnetic rotor (4) is controlled, so as to realize the zero adjustment of the valve seat (6) and the magnetic rotor (4). The torque change state of the magnetic rotor clamping cylinder (3) is monitored by the torque sensor (2). When the valve stem (5) is inserted into the communication port, the valve stem (5) cannot continue to move axially, and at the same time, the magnetic rotor (4) cannot continue to rotate relative to the valve seat (6). At this time, the torque sensor (2) monitors a sudden change in the torque of the magnetic rotor clamping cylinder (3), thereby confirming the zero position.

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