Switching valve and tissue dehydrator

Abstract

The application relates to the technical field of valves, in particular to a switching valve and a tissue dehydrator. The switching valve comprises a rotary driving assembly, an encoding disc, a sensing detection part and a switching valve body; the encoding disc is fixedly connected with the rotating end of the rotary driving assembly, the encoding disc is engraved with absolute encoding and relative encoding, and the absolute encoding and the relative encoding one-to-one correspond respectively; the sensing detection part detects the absolute encoding and the relative encoding passing through the detection area of the sensing detection part; the switching valve body is in transmission connection with the rotary driving assembly, the switching valve body is provided with a first output channel and a plurality of groups of first input channels, and when the switching valve body is in transmission cooperation with the rotary driving assembly, the first output channel and the first input channel indicated by the absolute position and the relative position can be correspondingly communicated. The switching valve combines the absolute encoding and the relative encoding to represent the channels, the absolute encoding and the relative encoding can be mutually checked, and the current on-off state of the switching valve can be accurately detected and verified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a switching valve and a tissue dehydrator. BACKGROUND

[0002] The tissue dehydrator is a kind of medical electric control automatic equipment, which removes water in the tissue sample by using dehydrating agent, is conducive to the transparency and wax permeability of the tissue, makes the paraffin supporting tissue keep the original state and harden to be embedded into a block, and achieves the permanent preservation of the tissue. The tissue dehydrator is suitable for use in laboratories of medical colleges, hospitals, medical research units, animal and plant research units and food detection departments. The switching valve is one of important components of the tissue dehydrator, which is used for controlling the outflow of solvents such as liquid paraffin, dimethylbenzene, acetone, water and alcohol.

[0003] In order to reduce the production cost and difficulty, the prior art uses the switching valve to control the outflow of multiple liquids. The switching valve usually adopts an integral structure of motor / gear box / position gear disc / optical switch, adopts a multi-path channel group design to select the inlet, at least one path channel group to flow out, and drives the switching valve through the motor when switching, records by the encoder, and detects by the optical detection device. However, the detection reliability of the existing switching valve is not high when in use, and errors are prone to occur. SUMMARY

[0004] The purpose of the present application is to provide a switching valve and a tissue dehydrator to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or create conditions.

[0005] In a first aspect, a switching valve is provided, comprising:

[0006] A rotary drive assembly;

[0007] An encoder disc, the encoder disc is fixedly connected with the rotating end of the rotary drive assembly, the encoder disc is engraved with absolute encodings for indicating absolute positions and relative encodings for indicating relative positions, the number of absolute encodings is the same as the number of relative encodings, and the absolute encodings and the relative encodings correspond to each other one by one;

[0008] A sensing detection part, the sensing detection part is arranged to be relatively movable with the encoder disc, and the sensing detection part detects the absolute encodings and the relative encodings passing through the detection area thereof;

[0009] A switching valve body, the switching valve body is in transmission connection with the rotary drive assembly, the switching valve body is provided with a first output channel and a plurality of groups of first input channels, the number of relative encodings is an integer multiple of the number of first input channels, a first input channel corresponds to an absolute encoding and a relative encoding, and when the switching valve body is in transmission cooperation with the rotary drive assembly, the first output channel and the first input channel corresponding to the absolute position and the relative position indicated thereby are communicated.

[0010] Further, the number of absolute encodings is twice the number of first input channels, and the number of absolute encoding detection sites of the sensing detection part and the number of first input channels satisfy the following relationship:

[0011] 2 n ≥2P;

[0012] Wherein, n represents the number of absolute encoding detection sites, and P represents the number of first input channels.

[0013] Further, the switching valve further comprises a processing module, and the encoding disc is further engraved with a zero position detection point for indicating a zero position, the processing module is respectively connected with the rotary driving assembly and the sensing detection part, and the processing module verifies whether the detected relative position and the absolute position match each other according to the position of the zero position detection point, the turning direction of the rotary driving assembly, the relative position detected by the relative encoding, and the absolute position detected by the absolute encoding.

[0014] Further, the switching valve further comprises a processing module, and the processing module is respectively connected with the rotary driving assembly and the sensing detection part, and the encoding disc is further engraved with a zero position detection point for indicating a zero position, the processing module verifies whether the detected relative position reaches the cumulative threshold and the zero position matches each other according to the relative position detected by the relative encoding and the position of the zero position detection point.

[0015] Further, the switching valve body is further provided with a second output channel and a plurality of groups of second input channels, the first input channels and the second input channels are one-to-one corresponding, and when the switching valve body is in transmission cooperation with the rotary driving assembly, the first output channel corresponding to the first input channel and the second output channel corresponding to the second input channel are communicated according to the absolute position and the relative position indicated by the absolute position and the relative position.

[0016] Further, the switching valve body comprises a valve body shell, a movable valve plate and a fixed valve plate assembled in the valve body shell, the movable valve plate and the fixed valve plate are stacked and arranged, and the rotary driving assembly is in transmission connection with the movable valve plate.

[0017] A first output common hole is arranged at the center of the movable valve plate, a first input common hole is arranged at the periphery of the first output common hole, and a plurality of first input holes are arranged in the fixed valve plate, the first input holes are distributed at intervals with the first output common hole as the center, the first output common hole is in communication with the first output channel, the first input common hole is in communication with the first output common hole, each first input hole is in communication with each first input channel, and when the rotary driving assembly drives the movable valve plate to rotate, the first output common hole is in communication with one of the first input holes through the first input common hole, so that the first output channel is in communication with one of the first input channels.

[0018] Further, the fixed valve plate is provided with a second input hole and a second output common hole, and an input ring groove is arranged at the center of the side of the fixed valve plate close to the movable valve plate, and a gas through groove is arranged on the side of the movable valve plate close to the fixed valve plate;

[0019] The number of the second input holes is the same as that of the first input holes, each second input hole is distributed at intervals with the first output common hole as the center, one second input hole and one first input hole are located on the same diameter, one end of the gas through groove is communicated with the input ring groove, the input ring groove is communicated with the second output common hole, the second output common hole is connected with a second output channel, when the rotary driving assembly drives the movable valve plate to rotate, the other end of the gas through groove is communicated with one second input hole, so that the second output channel is communicated with one second input channel.

[0020] Further, the valve body shell comprises a valve body base, a valve body sealing ring, a valve body sealing shell and a transmission plate;

[0021] The inside of the valve body base is provided with a first output channel and a first input channel, and the outer wall of the valve body base is provided with an adapter connected with the first output channel or the first input channel, the movable valve plate and the fixed valve plate are arranged in the inner cavity of the valve body base, the transmission plate is connected with the rotary driving assembly and the movable valve plate respectively, the valve body sealing shell is fixed at the opening of the valve body base, and the valve body sealing ring is wrapped on the valve body base and the outer side of the valve body base.

[0022] Further, the rotary driving assembly comprises a driving motor and a servo transmission part, and the driving motor is connected with the switching valve body through the servo transmission part.

[0023] In the second aspect, a tissue dehydration machine is provided, which comprises the switching valve of the first aspect.

[0024] The present application has the following advantages: absolute encoding and relative encoding are combined to represent the channels, the number of the absolute encoding and the relative encoding is an integer multiple of the number of the channels, the additional absolute encoding and the relative encoding can represent the position of the off switching valve channel, the absolute encoding and the relative encoding can be checked with each other, and the current on-off state of the switching valve can be accurately detected and verified. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of a switching valve according to an embodiment.

[0026] Figure 2 FIG. 2 is a sectional structural schematic diagram of the switching valve according to an embodiment.

[0027] Figure 3 FIG. 3 is a structural schematic diagram of an encoding disc according to an embodiment.

[0028] Figure 4 FIG. 4 is a structural schematic diagram of a movable valve plate at an angle according to an embodiment.

[0029] Figure 5 This is a schematic diagram of the moving valve plate in one embodiment from another angle.

[0030] Figure 6 This is a schematic diagram of the structure of a fixed valve plate according to one embodiment.

[0031] Figure 7 This is an exploded structural diagram of the switching valve body according to one embodiment.

[0032] Figure 8 This is a schematic diagram of the structure of a valve body base according to one embodiment.

[0033] Figure 9 This is a schematic diagram of the structure of a rotary drive assembly according to one embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] In the description of this invention, "several" means an indefinite quantity, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features. Furthermore, the use of "and / or" throughout the text indicates three parallel solutions; for example, A and / or B indicates a solution satisfied by A, a solution satisfied by B, or a solution satisfied by both A and B.

[0037] In the description of this invention, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0038] According to a first aspect of the present invention, a switching valve is provided.

[0039] like Figures 1 to 3 In one embodiment, the switching valve includes a rotary drive assembly 100, an encoder disk 200, a sensing detection unit 300, and a switching valve body 400. In this switching valve:

[0040] The encoding disc 200 is fixedly connected to the rotating end of the rotary driving assembly 100, and the encoding disc 200 is engraved with absolute encodings 210 for indicating absolute positions and relative encodings 220 for indicating relative positions, the number of the absolute encodings 210 is the same as the number of the relative encodings 220, and the absolute encodings 210 and the relative encodings 220 correspond to each other one by one.

[0041] The sensing detection part 300 is arranged to be relatively movable with the encoding disc 200, and the sensing detection part 300 detects the absolute encodings 210 and the relative encodings 220 passing through the detection area thereof.

[0042] The switching valve body 400 is drivingly connected to the rotary driving assembly 100, the switching valve body 400 is provided with a first output channel 410 and a plurality of groups of first input channels 420, the number of the relative encodings 220 is an integer multiple of the number of the first input channels 420, a first input channel 420 corresponds to an absolute encoding 210 and a relative encoding 220, and when the switching valve body 400 is drivingly matched with the rotary driving assembly 100, the first output channel 410 indicated by the absolute position and the relative position can be correspondingly communicated with the first input channel 420.

[0043] In the above switching valve, the inside of the switching valve body 400 is provided with the first output channel 410 and a plurality of groups of the first input channels 420, the first output channel 410 can be communicated with one of the first input channels 420, and under the rotation of the rotary driving assembly 100, the communication relationship of the rotary driving assembly 100 can be twisted, so that the first output channel 410 is communicated with another first input channel 420. The encoding disc 200 is fixedly connected to the rotating end of the rotary driving assembly 100, and follows the rotary driving assembly 100 to rotate, and the absolute encodings 210 and the relative encodings 220 on the encoding disc 200 detected by the sensing detection part 300 are acquired, and then the rotation angle of the rotary driving assembly 100 is recorded.

[0044] As shown in Figure 3 The absolute encodings 210 and the relative encodings 220 engraved on the encoding disc 200 are circularly distributed with the center of the encoding disc 200 as the center, one absolute encoding 210 and one relative encoding 220 are arranged on the same diameter, different detection signals are obtained when the sensing detection part 300 detects each absolute encoding 210 and relative encoding 220, a first input channel 420 corresponds to an absolute encoding 210 and a relative encoding 220, when the sensing detection part 300 detects the absolute encoding 210 and the relative encoding 220 corresponding to the first input channel 420, the first input channel 420 is communicated with the first output channel 410. The absolute encodings 210 can be arranged inside the relative encodings 220, or the absolute encodings 210 can be arranged outside the relative encodings 220, which is not limited in the present application.

[0045] The rotation driving assembly 100 drives the switching valve body 400 to rotate, thereby controlling the on or off of the first input channel 420 and the first output channel 410. The rotation driving assembly 100 stops when the sensing detection part 300 detects the absolute encoding 210 and the relative encoding 220 on the same diameter. Specifically, when a first input channel 420 and a first output channel 410 need to be turned on, the rotation driving assembly 100 receives a control signal, rotates forward or reverses a certain angle according to the control signal, and then stops, so that the sensing detection part 300 detects the absolute encoding 210 and the relative encoding 220 corresponding to the first input channel 420. When all first input channels 420 and first output channels 410 need to be cut off, the rotation driving assembly 100 stops at a position between two absolute encodings 210 (or relative encodings 220) corresponding to the first input channel 420. If the number of absolute encodings 210 (or relative encodings 220) is greater than the number of first input channels 420, an absolute encoding 210 (or relative encoding 220) for indicating that all first input channels 420 are cut off can be arranged between the two absolute encodings 210 (or relative encodings 220) corresponding to the first input channel 420. When the sensing detection part 300 recognizes the absolute encoding 210 (or relative encoding 220) for indicating that all first input channels 420 are cut off, the switching valve body 400 cuts off all first input channels 420.

[0046] As shown in Figure 3 and Figure 6 In an embodiment, the number of absolute encodings 210 is twice the number of first input channels 420, and the number of absolute encoding 210 detection sites of the sensing detection part 300 and the number of first input channels 420 satisfy the following relationship:

[0047] 2 n ≥2P;

[0048] Wherein, n represents the number of absolute encoding 210 detection sites, P represents the number of first input channels 420, and represents that the number of binary bits composed of the detection sites of the sensing detection part 300 is greater than or equal to the number of absolute encodings 210.

[0049] The absolute encoders 210 are distributed at intervals, and one absolute encoder 210 for cutting off all the first input channels 420 is arranged between two absolute encoders 210 corresponding to the first input channels 420. For example, the first absolute encoder 210 corresponds to the first input channel 420, the second absolute encoder 210 corresponds to cutting off all the first input channels 420, and the third absolute encoder 210 corresponds to the second input channel 420. When the first input channel needs to be turned on, the rotary driving assembly 100 is rotated to stop after the first absolute encoder reaches the detection area of the sensing detection part 300. When all the first input channels 420 need to be cut off, the rotary driving assembly 100 is rotated to stop after the second absolute encoder reaches the detection area of the sensing detection part 300. In this embodiment, binary counting is used to identify the absolute encoders 210. When the detection sites of the sensing detection part 300 detect the absolute encoders 210, the absolute encoders 210 block the detection light sources generated by some of the detection sites. Only the detection light sources emitted by the unblocked detection sites can be received. The number and position of the detection sites blocked by each absolute encoder 210 are different, thereby generating corresponding absolute encoder 210 detection signals and converting them into binary virtual signals for recording. For example, if all the detection sites except the first detection site are blocked by the absolute encoder 210, it can be converted into “1000”, which represents the eighth absolute encoder 210.

[0050] In an embodiment, the switching valve further comprises a processing module, and the code disc 200 is further engraved with a zero detection point 230 for indicating a zero position. The processing module is connected to the rotary driving assembly 100 and the sensing detection part 300, respectively. The processing module verifies whether the detected relative position and absolute position match each other according to the position of the zero detection point 230, the rotation direction of the rotary driving assembly 100, the relative position obtained by detecting the relative encoders 220, and the absolute position obtained by detecting the absolute encoders 210. The processing module receives the detection information of the sensing detection part 300 and the rotation state of the rotary driving assembly 100. When the zero detection point 230 passes through the sensing detection part 300, it indicates that the rotary driving assembly 100 has rotated one circle and the relative encoders 220 are corrected to zero. The processing module counts the rotation angle of the rotary driving assembly 100 according to the detection information of the sensing detection part 300, determines the absolute position corresponding to the current rotation angle by identifying the absolute encoders 210, and forms a verification signal by the number of times that the zero detection point 230 passes through the sensing detection part 300 and the detected relative encoders 220, to determine whether the currently determined absolute position is correct.

[0051] On the basis of the above-mentioned embodiments, the processing module receives the relative position obtained by the sensing detection unit 300 detecting the relative code 220 and the zero position obtained by the sensing detection unit 300 detecting the zero position detection point 230, and verifies whether the detected relative position reaches the accumulated threshold and the detected zero position matches each other. The processing module obtains the number of times the relative code 220 passes through the sensing detection unit 300 and the number of times the zero position detection point 230 passes through the sensing detection unit 300 from the sensing detection unit 300, clears the accumulation of the relative code 220 when the sensing detection unit 300 detects the zero position detection point 230, or controls the sensing detection unit 300 to detect the zero position detection point 230 again when the relative code 220 accumulates to the threshold and is cleared, so as to ensure that the accumulation of the relative code 220 and the detection timing of the zero position detection point match each other.

[0052] In some embodiments, the processing module also uses a fault-tolerant mechanism when verifying the absolute code 210 and the relative code 220, so as to determine whether the detection point of the sensing detection unit 300 is damaged and continue to identify and determine on the basis of determining that the detection point is damaged.

[0053] The processing module counts the relative code 220 for a plurality of times until the threshold is reached, and then determines that the zero position detection point 230 is damaged when the zero position detection point 230 passes through the sensing detection unit 300. The processing module determines the relative position by unilaterally obtaining the detection signal of the relative code 220 and counting, and maintains the mutual verification between the absolute code 210 and the relative code 220.

[0054] The sensing detection unit 300 simultaneously detects two adjacent absolute codes 210 and relative codes 220. When the detection point of any relative code 220 is damaged, the processing module can only obtain the detection signal of one detection point from the sensing detection unit 300. The processing module determines that the detection point that does not receive the detection signal is damaged, identifies the relative code 220 through the remaining detection points of the relative code 220, and maintains the detection of the relative code 220.

[0055] If any detection point of the absolute code 210 is damaged, the processing module determines that the binary detection information obtained by the detection point is incorrect according to the information represented by the absolute code 210. The current obtained binary detection information is the same as the binary detection information obtained on the previous side. The processing module infers the absolute code 210 currently entering the sensing detection unit 300 according to the information reflected by the relative code 220, and determines that there is a damaged detection point after the encoding disc 200 rotates one circle.

[0056] The specific structure of the switching valve body 400 will be described below.

[0057] As Figure 2As shown, in the embodiment, the switching valve body 400 is further provided with a second output channel 430 and a plurality of groups of second input channels 440, the first input channels 420 and the second input channels 440 are one-to-one corresponding, and when the switching valve body 400 is in transmission cooperation with the rotary driving assembly 100, the first output channel 410 and the first input channel 420 corresponding to the absolute position and the relative position are communicated, and the second output channel 430 and the second input channel 440 corresponding to the absolute position and the relative position are communicated.

[0058] The switching valve body 400 simultaneously connects the first output channel 410 with a first input channel 420 and the second output channel 430 with a second input channel 440, wherein the first input channel 420 can be connected to a liquid, and the second input channel 440 can be connected to a gas, so as to realize simultaneous liquid and gas transportation through the switching valve.

[0059] As shown in Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, in the embodiment, the switching valve body 400 includes a valve body shell 450, a movable valve plate 460 and a fixed valve plate 470 assembled in the valve body shell 450, the movable valve plate 460 and the fixed valve plate 470 are stacked and configured, and the rotary driving assembly 100 is in transmission connection with the movable valve plate 460. The center of the movable valve plate 460 is provided with a first output common hole 461, the periphery of the first output common hole 461 is provided with a first input common hole 462, the fixed valve plate 470 is provided with a plurality of first input holes 471, the first input holes 471 are distributed at intervals with the first output common hole 461 as the center, the first output common hole 461 is in communication with the first output channel 410, the first input common hole 462 is in communication with the first output common hole 461, each first input hole 471 is in communication with each first input channel 420, and when the rotary driving assembly 100 drives the movable valve plate 460 to rotate, the first output common hole 461 is in communication with one of the first input holes 471 through the first input common hole 462, so that the first output channel 410 is in communication with one of the first input channels 420.

[0060] As shown in Figure 4 and Figure 5As shown, in the embodiment, the fixed valve plate 470 is provided with the second input holes 472 and the second output common hole 473, and the input ring groove 474 is arranged at the center of the side of the fixed valve plate 470 close to the movable valve plate 460. The movable valve plate 460 is provided with the gas through groove 463 at the side close to the fixed valve plate 470. The number of the second input holes 472 is the same as that of the first input holes 471, and each second input hole 472 is distributed at intervals with the first output common hole 461 as the center. One second input hole 472 is located on the same diameter as one first input hole 471. One end of the gas through groove 463 is communicated with the input ring groove 474, and the input ring groove 474 is communicated with the second output common hole 473. The second output common hole 473 is connected with the second output channel 430. When the rotary driving assembly 100 drives the movable valve plate 460 to rotate, the other end of the gas through groove 463 is communicated with one second input hole 472, so that the second output channel 430 is communicated with one second input channel 440.

[0061] As shown in the drawings, Figure 8 In the embodiment, the valve body shell 450 includes the valve body base 451, the valve body sealing ring 452, the valve body sealing shell 453, and the transmission plate 454. The inside of the valve body base 451 is provided with the first output channel 410 and the first input channel 420. The outer wall of the valve body base 451 is provided with the adapter connected with the first output channel 410 or the first input channel 420. The movable valve plate 460 and the fixed valve plate 470 are arranged in the inner cavity of the valve body base 451. The transmission plate 454 is connected with the rotary driving assembly 100 and the movable valve plate 460, respectively. The valve body sealing shell 453 is fixed at the opening of the valve body base 451. The valve body sealing ring 452 is wrapped around the valve body base 451 and the outer side of the valve body base 451.

[0062] As shown in the drawings, Figure 9 In the embodiment, the rotary driving assembly 100 includes the driving motor 110 and the servo transmission member 120. The driving motor 110 is connected with the switching valve body 400 through the servo transmission member 120.

[0063] According to the second aspect of the present application, a tissue dehydrator is provided.

[0064] The tissue dehydrator includes the switching valve described above. The specific structure of the switching valve is referred to the above embodiments. Since the tissue dehydrator adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments. Here, the beneficial effects will not be repeated.

[0065] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A switching valve, characterized in that, include: Rotary drive assembly; The encoder disk is fixedly connected to the rotating end of the rotary drive assembly. The encoder disk is engraved with absolute codes for indicating absolute position and relative codes for indicating relative position. The number of absolute codes is the same as the number of relative codes, and the absolute codes and relative codes correspond one-to-one. The encoder disk is also engraved with zero-position detection points for indicating zero position. A sensing unit is arranged to be relatively movable with respect to an encoding disk, and the sensing unit detects the absolute and relative codes passing through its detection area. The switching valve body is connected to the rotary drive assembly. The switching valve body is provided with a first output channel and several sets of first input channels. The number of relative codes is an integer multiple of the number of first input channels. Each first input channel corresponds to an absolute code and a relative code. When the switching valve body is in drive with the rotary drive assembly, the first output channel indicated by the absolute position and the relative position can be connected to the corresponding first input channel. The processing module is connected to the rotation drive assembly and the sensing and detection unit respectively. The processing module verifies whether the detected relative position and absolute position match each other based on the position of the zero-position detection point, the direction of rotation of the rotation drive assembly, the relative position obtained by detecting relative encoding and the absolute position obtained by detecting absolute encoding. If the processing module fails to detect the zero-position detection point passing through the sensing unit after continuously counting and accumulating the relative code to a threshold several times, it determines that the zero-position detection point is damaged. The processing module uses unilateral acquisition of the detection signal of the relative code and counting and accumulating to determine the relative position, maintaining mutual verification between the absolute code and the relative code. The sensing detection unit simultaneously detects two adjacent absolute codes and relative codes. When the detection point of any relative code is damaged, the processing module can only obtain the detection signal of one of the detection points from the sensing detection unit. The processing module determines that the detection point that failed to receive the detection signal is damaged, and identifies the relative code through the remaining normal relative code detection points to maintain the detection of the relative code. When any detection point of the absolute code is damaged, the binary detection information obtained by the processing module based on the detection point does not match the information represented by the absolute code. If the currently obtained binary detection information is the same as the binary detection information obtained on the previous side, the processing module infers the absolute code currently entering the sensing detection unit based on the information reflected by the relative code, and determines that there is a damaged detection point after the code disk rotates once.

2. The switching valve according to claim 1, characterized in that, The number of absolute codes is twice the number of the first input channels, and the number of absolute code detection points of the sensing detection unit and the number of the first input channels satisfy the following relationship: ； Where n represents the number of absolute coding detection sites, and P represents the number of first input channels.

3. The switching valve according to claim 1, characterized in that, The switching valve also includes a processing module, which is connected to the rotary drive assembly and the sensing and detection unit. The encoder disk is also engraved with zero-position detection points to indicate the zero position. The processing module verifies whether the detected relative position reaches the cumulative threshold and whether the detected zero position matches each other based on the relative position obtained by detecting the relative encoding and the position of the zero-position detection point.

4. The switching valve according to claim 1, characterized in that, The switching valve body is also provided with a second output channel and several sets of second input channels. The first input channel and the second input channel correspond one-to-one. When the switching valve body is in transmission cooperation with the rotary drive assembly, the first output channel indicated by the absolute position and the relative position can be connected to the first input channel and the second output channel can be connected to the second input channel.

5. The switching valve according to claim 4, characterized in that, The switching valve body includes a valve body shell and a moving valve plate and a fixed valve plate assembled inside the valve body shell. The moving valve plate and the fixed valve plate are stacked. The rotary drive assembly is drivenly connected to the moving valve plate. The moving valve plate has a first output common hole at its center, and a first input common hole is provided around the first output common hole. The fixed valve plate has a plurality of first input holes, and each first input hole is distributed at intervals around the first output common hole. The first output common hole is connected to the first output channel, and the first input common hole is connected to the first output common hole. Each first input hole is connected to each first input channel. When the rotary drive component drives the moving valve plate to rotate, the first output common hole is connected to one of the first input holes through the first input common hole, so that the first output channel is connected to one of the first input channels.

6. The switching valve according to claim 5, characterized in that, The fixed valve plate has a second input hole and a second output common hole. The fixed valve plate has an input ring groove at the center of the side near the moving valve plate. The moving valve plate has a gas passage groove on the side near the fixed valve plate. The number of second input holes is the same as the number of first input holes. Each second input hole is distributed at intervals with the first output common hole as the center. One second input hole and one first input hole are located on the same diameter. One end of the gas passage is connected to the input ring groove. The input ring groove is connected to the second output common hole. The second output common hole is connected to a second output channel. When the rotary drive assembly drives the moving valve plate to rotate, the other end of the gas passage is connected to one of the second input holes, so that the second output channel is connected to one of the second input channels.

7. The switching valve according to claim 5 or 6, characterized in that, The valve body housing includes a valve body base, a valve body sealing ring, a valve body sealing shell, and a transmission plate; The valve body base has a first output channel and a first input channel inside. The outer wall of the valve body base is provided with an adapter to connect the first output channel or the first input channel. The moving valve plate and the fixed valve plate are arranged in the inner cavity of the valve body base. The transmission plate is connected to the rotary drive assembly and the moving valve plate respectively. The valve body cover is fixed to the opening of the valve body base. The valve body sealing ring covers the valve body base and the outer side of the valve body base.

8. The switching valve according to claim 1, characterized in that, The rotary drive assembly includes a drive motor and a servo transmission component, and the drive motor is connected to the switching valve body through the servo transmission component.

9. A tissue dehydrator, characterized in that, Includes the switching valve as described in any one of claims 1-8.

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