A washing machine and a sliding potentiometer monitoring circuit

Abstract

The invention relates to the technical field of washing machines, and discloses a washing machine and a sliding potentiometer monitoring circuit. The washing machine comprises: a box body, a clutch is arranged in the box body, and the clutch is connected to a lever; an outer barrel, the outer barrel is arranged in the box body; an inner barrel, the inner barrel is arranged in the outer barrel; and further comprises: a tractor, arranged in the box body, and used for pulling the lever to switch the working state of the washing machine. The tractor comprises: a sliding potentiometer monitoring circuit, which is used for real-time monitoring of the tractor and for determining the distance of pulling the lever, thereby realizing that the traction length of the tractor is controllable, the traction accuracy is high, and the structure is simple and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of washing machines, in particular to a washing machine and a sliding potentiometer monitoring circuit. Background Art

[0002] A washing machine is a cleaning appliance that uses electrical energy to generate mechanical action to wash clothes. More and more people use washing machines to wash large items such as clothes and bedding, saving time and effort. Washing machines are becoming an indispensable household appliance in people's lives. Among them, the tractor is an important component in the washing machine that switches the working state of the washing machine.

[0003] The traction devices commonly used at present have the following characteristics: 1. Single-stroke traction device, with a single stroke, maintains the pulling force when the power is on, and the pulling force disappears and the traction is cancelled when the power is off. The small motor and transmission gears inside move together. This is the most basic traction device with a single application range; 2. Contact-type multi-stroke traction device, with multiple traction strokes, multiple input terminals respectively control multiple strokes, maintains the pulling force when the power is on, and the pulling force disappears and the traction is cancelled when the power is off. The small motor, transmission gears and multiple contacts inside determine the current traction stroke; this type of traction device is affected by the stroke and has many input terminals. The more input terminals, the more complex the structure and the lower the reliability. The worse it is, and the traction force disappears when the power is off, and it quickly returns to the initial position. It is not suitable for some situations that require slow recovery, and a double-stroke traction device is commonly used; 3. Cam-type multi-stroke traction device has multiple traction strokes, two input terminals, and a zero-crossing detection terminal. The motor is powered on for unidirectional traction, and the traction is maintained when the power is off. The initial position is detected by zero crossing, and the traction position is determined by the traction time. This type of traction device is greatly affected by the traction load. The traction speed is slow when the load is large and the traction speed is fast when the load is small. In addition, the influence of its own accuracy leads to a large error in the traction distance. At the same time, it cannot be detected when there is no traction or the traction is too large or too small. Summary of the invention

[0004] In some embodiments of the present application, a washing machine and a sliding potentiometer monitoring circuit are provided. The washing machine includes a housing, an outer barrel, an inner barrel and a traction device. The traction device is used to switch the working state of the washing machine, and the traction device includes a sliding potentiometer monitoring circuit, so that the traction distance is controllable and the traction mechanism is simple.

[0005] In some embodiments of the present application, a sliding potentiometer monitoring circuit is added, and a cam structure is added in the traction device. When the cam rotates, it drives the load (lever) to move, and at the same time, the cam structure drives the slider to move on the sliding potentiometer, and the traction distance is converted into the slider movement distance. When the slider moves on the sliding potentiometer, the position on the sliding potentiometer changes, so that the resistance value of the sliding potentiometer also changes, and the traction distance is converted into a resistance value. The resistance value is output to the controller by detecting the output end to achieve the purpose of real-time detection of the traction distance.

[0006] In some embodiments of the present application, the working form of the traction device is improved, and the controller is connected to the traction motor to control the traction motor to pull the shift rod to move, and when the traction motor stops rotating, the traction motor is controlled to maintain the position of stopping rotation.

[0007] In some embodiments of the present application, the washing machine further includes: a fixed carrier connected to the outer tub, and a middle portion of the lever is rotatably connected to the fixed carrier to limit the position of the lever.

[0008] In some embodiments of the present application, the clutch in the washing machine includes: a connecting sleeve, and the driving end of the driving rod abuts against the connecting sleeve to convert the traction power of the driving rod into the moving power of the connecting sleeve.

[0009] In some embodiments of the present application, the traction device pulls the traction end of the lever to limit the lever from rotating around the connection between the lever and the fixed carrier, and the driving end of the lever presses the connecting sleeve to move from the transmission position to the locking position to switch the washing machine from the dehydration state to the washing state.

[0010] In some embodiments of the present application, the traction device includes: a shell and a traction wheel, the shell is connected to the bottom of the outer barrel to accommodate a traction motor, a traction wheel and a transmission member; a traction shaft is provided on the traction wheel, the traction shaft is connected to a traction rope, the traction rope is connected to the shift rod, and the traction wheel is rotatably provided on the shell to pull the shift rod to move; the traction motor is provided on the shell, and the motor shaft of the traction motor is passed through the interior of the shell, and the traction motor is used to provide traction torque for the traction device; the transmission member is provided between the traction wheel and the traction motor to transmit the output torque of the traction motor to the traction wheel.

[0011] In some embodiments of the present application, a sliding potentiometer monitoring circuit is further provided, which is applied to the above-mentioned washing machine, and the sliding potentiometer monitoring circuit is used to monitor in real time the distance moved by the traction device pulling the lever.

[0012] In some embodiments of the present application, the sliding potentiometer monitoring circuit includes: a cam, a sliding potentiometer, a slider and a detection output end, the cam is connected to the traction wheel so that the cam and the traction wheel rotate synchronously; the sliding potentiometer is arranged on the housing; one end of the slider is slidably arranged on the sliding potentiometer to change the resistance value of the sliding potentiometer, and the other end of the slider touches the cam; the detection output end is electrically connected to the sliding potentiometer to output the resistance change of the sliding potentiometer.

[0013] In some embodiments of the present application, the distances from various points on the profile of the cam to the rotation center of the cam are different.

[0014] In some embodiments of the present application, the rotating cam contacts the sliding piece and moves it to different positions of the sliding potentiometer, so as to convert the moving distance of the lever into the resistance value change of the sliding potentiometer.

[0015] In some embodiments of the present application, the traction motor and the detection output end are both connected to the controller, the controller is used to determine the resistance change of the sliding potentiometer in real time, and the controller is used to control the rotation angle of the motor shaft of the motor, and the controller is configured to: when the traction motor stops rotating, control the traction motor to maintain the position of stopping rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a washing machine according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of a washing machine according to an embodiment of the present invention;

[0018] Figure 3 Embodiment of the present invention Figure 2 A cross-sectional view of

[0019] Figure 4 is a schematic diagram of the structure of a motor, a reducer and a clutch according to an embodiment of the present invention;

[0020] Figure 5 Embodiment of the present invention Figure 4 A cross-sectional view of

[0021] Figure 6 is a top view of the outer barrel in an embodiment of the present invention;

[0022] Figure 7 is a schematic structural diagram of a tractor in an embodiment of the present invention;

[0023] Figure 8 is a schematic diagram of the structure of a sliding potentiometer monitoring circuit in an embodiment of the present invention;

[0024] Fig. 9 It is one of the structural schematic diagrams of the cam in the embodiment of the present invention;

[0025] Fig.10 It is one of the structural schematic diagrams of the cam in the embodiment of the present invention.

[0026] In the figure,

[0027] 100, box body; 110, outer barrel; 120, inner barrel; 130, fixed carrier; 140, clutch; 150, lever;

[0028] 200, traction device; 210, housing; 220, traction motor; 221, motor shaft; 230, traction wheel; 231, traction shaft; 240, transmission member; 241, first transmission shaft; 242, second transmission shaft; 243, motor gear; 244, first transmission gear; 245, second transmission gear; 246, cam; 247, sliding potentiometer; 248, slider; 249, detection output terminal;

[0029] 300, clutch; 310, locking sleeve; 320, connecting sleeve;

[0030] 400, motor; 410, rotating part; 420, fixed part;

[0031] 500, dehydration shaft; 510, dehydration input shaft; 520, dehydration output shaft; 530, connecting cylinder;

[0032] 600, washing shaft; 610, washing input shaft; 620, washing output shaft;

[0033] 710, sun gear; 720, planet gear; 730, planet carrier. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] like Figure 1 and Figure 2 As shown, according to some embodiments of the present application, a washing machine is provided, comprising: a housing 100; an outer tub 110, wherein the outer tub 110 is disposed in the housing 100;

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, the washing machine further includes an inner barrel 120, which is disposed in the outer barrel 110; a motor 400, which is disposed at the bottom of the outer barrel 110; and a fixed carrier 130, which is located at the bottom of the outer barrel 110 and is fixedly connected to the outer barrel 110;

[0040] like Figure 5 As shown, the washing machine also includes: a dehydration shaft 500, which is rotatably arranged on the fixed carrier 130, the extension direction of the dehydration shaft 500 is parallel to the central axis of the inner barrel 120, and the dehydration shaft 500 is transmission-connected to the inner barrel 120; a washing input shaft 610, which is transmission-connected to the rotating part 410 of the motor 400; a washing output shaft 620, the extension direction of the dehydration shaft 500 is parallel to the central axis of the inner barrel 120, and the washing output shaft 620 is transmission-connected to the impeller; a reducer, which is connected between the washing input shaft 610 and the washing output shaft 620.

[0041] The motor 400 may have the following structure: Figure 3 and Figure 4 As shown, the motor 400 includes a rotating part 410 (rotor) and a fixed part 420 (stator), the rotating part 410 is a shell 210 structure, and the fixed part 420 is arranged inside the rotating part 410; as shown in the figure and the figure, the fixed carrier 130 includes a fixed shell 210 and a fixed frame connected to the fixed shell 210, the fixed shell includes an upper half shell and a lower half shell that are matched together and fixedly connected, and the upper half shell is fixedly connected to the bottom of the outer barrel 110; the reducer is arranged in the fixed shell.

[0042] like Figure 5As shown, the connecting sleeve 320 is sleeved on the dehydration shaft 500 and is located between the locking sleeve 310 and the rotating transmission member 240. Along the circumference of the connecting sleeve 320, the connecting sleeve 320 and the dehydration shaft 500 are relatively fixed, and along the axial direction of the connecting sleeve 320, the connecting sleeve 320 can move relative to the dehydration shaft 500.

[0043] Among them, Figure 5 As shown, the connecting sleeve 320 and the dehydration shaft 500 can be connected by a spline or a flat key to achieve that the connecting sleeve 320 and the dehydration shaft 500 are relatively fixed along the circumference of the connecting sleeve 320 , and the connecting sleeve 320 can move relative to the dehydration shaft 500 along the axial direction of the connecting sleeve 320 .

[0044] When the washing machine is in the washing state, Figure 3 , Figure 4 and Figure 5 As shown, the tractor 200 pulls the upper end of the lever 150 through the traction rope to rotate the lever 150 around the hinge axis, so that the lower end of the lever 150 abuts against the connecting sleeve 320, and applies a force to the connecting sleeve 320 to move the connecting sleeve 320 to the locking position. Since the locking sleeve 310 is fixed on the fixed carrier 130, along the circumference of the connecting sleeve 320141, the connecting sleeve 320 is relatively fixed to the dehydration shaft 500, and the locking sleeve 310 is relatively fixed to the connecting sleeve 320. At this time, the locking sleeve 310 is fixed to the connecting sleeve 320. 10 can lock the rotation of the connecting sleeve 320, and then lock the dehydration shaft 500 to disconnect the power transmission between the connecting sleeve 320 and the rotating part 410 of the motor 400. At this time, the rotating part 410 of the motor 400 drives the washing input shaft 610 to rotate at a high speed. The rotation speed of the washing input shaft 610 is transmitted to the washing output shaft 620 after being decelerated by the reducer, and then the washing output shaft 620 drives the impeller at the bottom of the inner barrel 120 to rotate at a low speed, thereby washing the clothes in the inner barrel 120.

[0045] When the pulsator washing machine switches to the dehydration state, when the traction device 200 stops pulling the traction rope, the lever 150 is no longer affected by the tension of the traction rope. At this time, the lever 150 rotates in the opposite direction around the hinge axis under the action of the reset force of the elastic reset member, so that the lower end of the lever 150 is disengaged from the connecting sleeve 320 to reset the lever 150; after the lever 150 is reset, the connecting sleeve 320 is no longer affected by the lower end of the lever 150. At this time, the first elastic member applies elastic force to the connecting sleeve 320 to move the connecting sleeve 320 to the transmission position.

[0046] When the washing machine is in the dehydration state, the traction device 200 pulls the connecting sleeve 320 to the transmission position, the rotating part 410 of the motor 400 rotates the washing input shaft 610, and the washing input shaft 610 drives the sun gear 710 to rotate; at the same time, the rotating part 410 of the motor 400 drives the dehydration shaft 500 (the dehydration input shaft 510, the dehydration output shaft 520 and the connecting cylinder 530) to rotate in the same direction and speed as the sun gear 710 through the rotating transmission member 240, and the dehydration output shaft 520 drives the inner tub 120 and the sun gear 710 to rotate. 0 rotates in the same direction and at the same speed, and at the same time, the connecting drum 530 drives the outer ring gear and the sun gear 710 to rotate in the same direction and at the same speed. According to the characteristics of the planetary gear 720 system, the planetary carrier 730 rotates in the same direction and at the same speed as the sun gear 710 at this time; because the planetary carrier 730 is connected to the washing output shaft 620, the planetary carrier 730 can drive the pulsator and the sun gear 710 to rotate in the same direction and at the same speed through the washing output shaft 620. At this time, the inner tub 120 and the pulsator rotate in the same direction and at the same speed, thereby centrifugal dehydration treatment is performed on the clothes in the inner tub 120.

[0047] like Figure 6 and Figure 7 As shown, according to some embodiments of the present application, the washing machine includes a traction device 200, which is disposed in the housing 100 and is used to pull the lever 150 to switch the working state of the washing machine.

[0048] like Figure 7 As shown, according to some embodiments of the present application, the tractor 200 includes a shell 210 , which is box-shaped and has a first axial hole, a second axial hole, and a third axial hole.

[0049] The housing 210 is connected to the bottom of the outer barrel 110 and is used to contain the traction motor 220 , the traction wheel 230 and the transmission member 240 .

[0050] like Figure 7 As shown, according to some embodiments of the present application, the traction device 200 includes a traction motor 220, and the connection terminal of the traction motor 220 is passed through the first shaft hole through a wire.

[0051] The traction motor 220 is used to provide traction torque for the tractor 200 .

[0052] like Figure 7 As shown, according to some embodiments of the present application, the tractor 200 includes a traction wheel 230 , which is disc-shaped, and a traction shaft 231 is disposed on the top of the traction wheel 230 .

[0053] The traction wheel 230 is rotatably disposed on the housing 210 . A traction shaft 231 is disposed on the traction wheel 230 . The traction shaft 231 is connected to a traction rope, and the traction rope is connected to the shifting rod 150 .

[0054] The traction wheel 230 rotates with the second transmission shaft 242 to pull the traction rope, and the traction rope pulls the lever 150 to change the working state of the washing machine.

[0055] like Figure 7 As shown, according to some embodiments of the present application, the tractor 200 includes a transmission member 240 , and the transmission member 240 includes a first transmission shaft 241 , a second transmission shaft 242 , a motor 400 gear 243 , a first transmission gear 244 and a second transmission gear 245 .

[0056] The transmission member 240 is disposed between the traction wheel 230 and the traction motor 220 to transmit the output torque of the traction motor 220 to the traction wheel 230 .

[0057] Specifically, the first transmission shaft 241 is rotatably disposed on the inner wall of the shell 210, the second transmission shaft 242 is rotatably disposed on the inner wall of the shell 210, and one end of the second transmission shaft 242 extends to the outside of the shell 210, and the traction wheel 230 is connected to the second transmission shaft 242, the motor 400 gear 243 is disposed on the motor 400 shaft 221 of the traction motor 220, the first transmission gear 244 is disposed on the first transmission shaft 241, and the first transmission gear 244 is meshedly connected to the motor 400 gear 243, and the second transmission gear 245 is disposed on the second transmission shaft 242, and the second transmission gear 245 is meshedly connected to the first transmission gear 244.

[0058] The first transmission shaft 241 is used to receive the torque of the traction motor 220, the second transmission shaft 242 is used to receive the torque of the traction motor 220 transmitted by the first transmission shaft 241, the motor 400 gear 243 is used to transmit the torque of the traction motor 220 to the first transmission gear 244, the first transmission gear 244 is used to transmit the torque of the traction motor 220 to the first transmission shaft 241 and drive the first transmission shaft 241 to rotate, and the second transmission gear 245 is used to make the second transmission shaft 242 and the first transmission shaft 241 rotate together.

[0059] like Figure 7 and Figure 8 As shown, according to some embodiments of the present application, the tractor 200 includes a sliding potentiometer monitoring circuit, and the sliding potentiometer monitoring circuit is used to monitor in real time the distance that the tractor 200 pulls the lever 150 to move.

[0060] According to some embodiments of the present application, the sliding potentiometer monitoring circuit includes: a cam 246, a sliding potentiometer 247, a slider 248 and a detection output terminal 249, and the distances from various points on the contour of the cam 246 to the rotation center of the cam 246 are different.

[0061] The cam 246 is disposed on the traction wheel 230 . Specifically, the cam 246 is connected to the second transmission shaft 242 , so that the cam 246 and the traction wheel 230 rotate synchronously.

[0062] The sliding potentiometer 247 is disposed on the housing 210 .

[0063] The sliding potentiometer 247 is used to convert the linear travel of the slider 248 into a measurable and recordable value, that is, into a resistance value.

[0064] Sliding Plate 248 One end of the sliding plate 248 is slidably disposed on the sliding potentiometer 247 to change the resistance value of the sliding potentiometer 247 , and the other end of the sliding plate 248 contacts the cam 246 .

[0065] The slide 248 is used to convert the curved stroke of the cam 246 into a linear stroke.

[0066] The detection output terminal 249 is electrically connected to the sliding potentiometer 247 .

[0067] The monitoring output terminal is used to output the resistance value of the sliding positioner.

[0068] In the process of the sliding potentiometer monitoring circuit detecting the distance moved by the traction device 200 pulling the lever 150, the rotating cam 246 contacts the slide 248 and moves to different positions of the sliding potentiometer 247 to convert the distance moved by the lever 150 into the change in resistance of the sliding potentiometer 247, thereby ensuring the accuracy of the traction device 200 in monitoring the moving distance of the traction lever 150.

[0069] That is, during the process of the cam 246 rotating with the second transmission shaft 242, the cam 246 contacts the slider 248 and slides on the sliding potentiometer 247 to change the resistance of the sliding potentiometer 247. When the slider 248 slides on the sliding potentiometer 247, the resistance of the sliding potentiometer 247 is changed by changing a single variable (the power-on length of the sliding potentiometer 247). The detection output terminal 249 detects the change in resistance of the sliding potentiometer 247 in real time and transmits the change in resistance to the controller. The controller controls the traction distance of the traction device 200 by quantitatively changing the resistance of the sliding potentiometer 247.

[0070] The rotating cam 246 contacts the sliding plate 248 and moves to different positions of the sliding potentiometer 247 to convert the moving distance of the lever 150 into the resistance change of the sliding potentiometer 247, so that the moving distance L of the lever 150 and the resistance change of the sliding potentiometer 247 generate a one-to-one correspondence.

[0071] Specifically, Fig. 9 and Fig.10As shown, the initial radius of the cam 246 is r1, the termination radius of the cam 246 is r2, the opening width of the cam 246 is A, the distance from the traction shaft 231 to the traction center is r3, the initial distance of the slide 248 on the slide potentiometer 247 is L2, the termination sliding distance of the slide 248 on the slide potentiometer 247 is L1, and the maximum sliding distance of the slide potentiometer 247 is L3. The relationship between the traction length and the resistance value can be derived based on the above values. The derivation process is as follows:

[0072] After the cam rotates by angle θ, the pulling length L = r3 * (1-cosθ) (1)

[0073] The increase in the radius of the cam curve is: Δr = r2-r1 = (A / 2)*θ (2)

[0074] The distance that the slide 248 moves is the same as the increase in the radius of the cam curve: L1-L2=Δr

[0075] The resistance value of the sliding potentiometer 247 in the initial state is: R = L2 / L3*Rtotal (3)

[0076] After rotating the slider potentiometer 247 by an angle of θ, the resistance value is: R = L1 / L3*R (4)

[0077] From formula (1) to formula (4), it can be seen that the rotation angle θ and the resistance value ΔR are in a one-to-one relationship, so the cam movement position can be determined by detecting the resistance value.

[0078] According to some embodiments of the present application, the sliding potentiometer monitoring circuit further includes a controller, which is connected to the traction motor 220 and the detection output terminal 249 .

[0079] The controller is used to determine the resistance change of the sliding potentiometer 247 in real time, and the controller is used to control the rotation angle of the motor shaft 221 of the motor 400 to achieve controllable traction distance of the tractor 200.

[0080] The controller is configured to control the traction motor 220 to maintain a position where the traction motor 220 stops rotating when the traction motor 220 stops rotating.

[0081] The specific working principle of the cam 246 is as follows: when the cam 246 rotates, the radius from the contact point of the cam 246 and the slider 248 to the traction center changes in real time, and the change in the radius from the contact point of the cam 246 and the slider 248 to the traction center drives the slider 248 to slide on the sliding potentiometer 247 to change the resistance value connected to the sliding potentiometer 247 by changing the energized length of the sliding potentiometer 247, and pulls the lever 150 during the rotation of the cam 246, converting the traction distance into the moving distance of the lever 150, thereby changing the working state of the washing machine, and because the controller can obtain the resistance value of the sliding potentiometer 247 in real time and control the rotation angle of the traction motor 220, the traction device 200 can stop at all points within the stroke, and the traction device 200 can maintain the current traction position.

[0082] According to the first concept of the present application, a sliding potentiometer monitoring circuit is added and a cam structure is added in the traction device. When the cam rotates, it drives the load (lever) to move. At the same time, the cam structure drives the slider to move on the sliding potentiometer, and the traction distance is converted into the slider movement distance. When the slider moves on the sliding potentiometer, the position on the sliding potentiometer changes, so that the resistance value of the sliding potentiometer also changes, and the traction distance is converted into a resistance value. The resistance value is output to the controller through the detection output end to achieve the purpose of real-time detection of the traction distance. Therefore, the traction device detects the traction distance with high accuracy and improves the working performance of the washing machine.

[0083] According to the second concept of the present application, since the working form of the traction device is improved, the controller is connected to the traction motor to control the traction motor to pull the shift rod to move, and when the traction motor stops rotating, the traction motor is controlled to maintain the position where it stops rotating, thereby ensuring that the traction distance of the traction device is highly accurate and the traction length is controllable, and avoiding the situation where the traction motor stops and the shift fork returns to the initial position.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A washing machine, comprising: A box body, wherein a clutch is arranged in the box body, and the clutch is connected to a lever; An outer barrel, the outer barrel being arranged in the box body; An inner barrel, wherein the inner barrel is disposed in the outer barrel; It is characterized by further comprising: A tractor is arranged in the box body and is used to pull the lever to switch the working state of the washing machine. The tractor includes: A sliding potentiometer monitoring circuit is used to monitor in real time the distance that the puller pulls the lever to move; A fixed carrier connected to the outer barrel, and a middle portion of the lever is rotatably connected to the fixed carrier; A connecting sleeve, the moving end of the shifting rod abuts against the connecting sleeve; The traction device pulls the traction end of the lever to limit the lever from rotating around the connection between the lever and the fixed carrier, and the driving end of the lever presses the connecting sleeve to move from the transmission position to the locking position to switch the washing machine from the dehydration state to the washing state; A shell body connected to the bottom of the outer barrel; A traction wheel, wherein a traction shaft is provided on the traction wheel, a traction rope is connected to the traction shaft, the traction rope is connected to the shifting rod, and the traction wheel is rotatably provided on the housing to pull the shifting rod to move; A traction motor is arranged on the housing, and a motor shaft of the traction motor passes through the interior of the housing; A transmission member is disposed between the traction wheel and the traction motor to transmit the output torque of the traction motor to the traction wheel.

2. A sliding potentiometer monitoring circuit, characterized in that: Applicable to the washing machine as claimed in claim 1, wherein the sliding potentiometer monitoring circuit is used to monitor in real time the distance moved by the pulling device pulling the lever; The sliding potentiometer monitoring circuit comprises: A cam is disposed on the traction wheel so that the cam and the traction wheel rotate synchronously; A sliding potentiometer, wherein the sliding potentiometer is arranged on the housing; A slide, one end of which is slidably disposed on the slide potentiometer to change the resistance value of the slide potentiometer, and the other end of which contacts a cam; A detection output terminal, the detection output terminal is electrically connected to the sliding potentiometer; The distances from various points on the profile of the cam to the rotation center of the cam are different; The rotating cam contacts the slide plate and moves to different positions of the slide potentiometer, so as to convert the moving distance of the lever into the resistance change of the slide potentiometer; The sliding potentiometer monitoring circuit also includes: A controller, the traction motor and the detection output end are both connected to the controller, the controller is used to determine the resistance change of the sliding potentiometer in real time, and the controller is used to control the rotation angle of the motor shaft of the motor, and the controller is configured as follows: When the traction motor stops rotating, the traction motor is controlled to maintain a position where the rotation stops.

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