Driving motor, linear driving device and lifting column equipment

Abstract

The utility model provides a driving motor, a linear driving device and lifting column equipment. The driving motor comprises a motor shell, a driving module, a driving shaft, a control assembly and a connecting wire. A first cavity, a second cavity and a wiring channel are arranged in the motor shell. The first cavity and the second cavity are both communicated with the wiring channel. The driving module is arranged in the first cavity. The driving shaft penetrates through the motor shell from the interior of the motor shell to the exterior of the motor shell and at least penetrates through a first cavity in the motor shell. The driving module drives the driving shaft to rotate. The control assembly is arranged in the second cavity. The second cavity is configured to be capable of being filled with glue so as to seal the control assembly. And the connecting wire passes through the wiring channel. The connecting line is connected with the driving module and the control assembly. The driving motor, the linear driving device and the lifting column equipment provided by the utility model are easy to assemble and good in sealing and waterproof performance.

Description

Technical Field

[0001] The present application relates to the technical field of drive equipment, and in particular to a drive motor, a linear drive device and a lifting column device. Background Art

[0002] The drive motor sometimes needs to work in harsh environments, such as underground or underwater, and the drive motor is prone to water ingress and other problems. In the related art, the control component that controls the operation of the drive motor is arranged outside the motor housing, and is electrically connected to other structures by extending into the motor housing through cables, so the control component needs to be separately glued and sealed. However, the assembly process of the above structure is cumbersome and costly; and the working environment of the control component is hot and humid, which can easily cause the cables to loosen and be damaged; and the cables are prone to shaking, which can easily cause sealing failure. Utility Model Content

[0003] In view of this, the present application provides a drive motor, a linear drive device and a lifting column device, which are easy to assemble and have good sealing and waterproof performance.

[0004] One embodiment of the present application provides a driving motor. The driving motor includes a motor housing, a driving module, a driving shaft, a control component and a connecting wire. A first chamber, a second chamber and a wiring channel are provided inside the motor housing. Both the first chamber and the second chamber are connected to the wiring channel. The driving module is arranged in the first chamber. The driving shaft is passed from the inside of the motor housing to the outside of the motor housing, and at least passes through the first chamber inside the motor housing. The driving module drives the driving shaft to rotate. The control component is arranged in the second chamber. The second chamber is configured to be able to be filled with glue to seal the control component. The connecting wire passes through the wiring channel. The connecting wire is connected to the driving module and the control component.

[0005] In the above embodiment, by setting the second chamber and the wiring channel inside the motor housing, the control component and the connecting wire can be set in the motor housing and protected by the motor housing. In addition, the drive module is fixed in the first chamber. After the control component is fixed in the second chamber, the connecting wire is also fixed. The assembly process of the drive motor is simple, which is conducive to reducing production costs. At the same time, the structures such as the drive module, the control component and the connecting wire are relatively fixed. On the one hand, the connecting wire is constrained in the wiring channel and is not easy to shake, so it is convenient to pour glue into the second chamber. On the other hand, the wiring channel is located at a more internal position of the motor housing than the second chamber. Even if the connecting wire shakes during glue pouring, it can only affect the glue pouring effect on the inside, and has no effect on the sealing performance on the outside. After pouring glue into the second chamber to seal and fix the control component, the wiring channel is also sealed at the same time, thereby improving the sealing effect of the drive motor. In addition, the connecting wire is inside the motor housing and is constrained by the wiring channel. The connecting wire can be in a stable and dry working environment, thereby improving the working life of the connecting wire.

[0006] In some embodiments of the present application, the control assembly includes a drive control board and a sensor. The drive control board is connected to the connecting line. The sensor is arranged on the drive control board. The sensor is configured to sense the rotation state of the drive shaft and transmit it to the drive control board.

[0007] In the above embodiment, the drive control board controls the drive module to control the rotation of the drive shaft. The sensor senses the rotation state of the drive shaft and provides it to the drive control board, so that the drive control board can control the drive module to improve the accuracy of the rotation control of the drive shaft, which is conducive to improving the working stability of the drive motor.

[0008] In some embodiments of the present application, a third chamber is further provided inside the motor housing. The third chamber is communicated with the wiring channel. The control assembly further includes a partition plate. The drive control board is connected to the partition plate. The partition plate separates the second chamber from the third chamber. The drive motor further includes a brake. The brake is provided in the third chamber. The brake is configured to brake the rotation of the drive shaft. The brake is connected to the control assembly via a connecting line.

[0009] In the above embodiment, after the driving module drives the driving shaft to rotate forward to the right position, the driving shaft is braked by the brake to prevent the driving shaft from being driven by the connected structure to rotate in the opposite direction, thereby improving the working stability of the driving motor. The second chamber and the third chamber are separated by a partition plate. When the control component is not installed in the second chamber, the second chamber and the third chamber are connected, which is convenient for installing the control component and the brake into the second chamber and the third chamber respectively. After the partition plate is assembled in place, when the glue is poured into the second chamber, it is helpful to prevent the glue from entering the third chamber. The driving control board is connected to the partition plate to improve the stability of the internal structures of the control component and facilitate the glue filling and sealing in the second chamber.

[0010] In some embodiments of the present application, the partition plate is provided with a first avoidance hole. The drive shaft passes through the partition plate through the first avoidance hole. The drive shaft is provided with a sensing matching portion. The sensing matching portion is located between the partition plate and the drive control board. The sensor is configured to sense the rotation state of the sensing matching portion.

[0011] In the above embodiment, the sensor senses the rotation state of the sensing mating part to obtain the rotation state of the entire drive shaft. The sensing mating part is arranged between the partition plate and the drive control board to shorten the distance between the sensing mating part and the sensor, thereby improving the accuracy of the sensor in sensing the rotation state of the drive shaft.

[0012] In some embodiments of the present application, the partition plate is provided with a guide portion, which is arranged on the peripheral side of the first avoidance hole, and is located on a side of the partition plate facing the third chamber.

[0013] In the above embodiment, powder may be generated when the brake brakes the drive shaft. The guide portion is arranged on the side facing the third chamber. When the powder moves from the third chamber to the second chamber, the guide portion guides the powder in a direction away from the first avoidance hole, thereby reducing the possibility of the powder entering the second chamber through the first avoidance hole, thereby reducing the interference of the powder on the sensor, which is beneficial to improving the accuracy of the sensor in sensing the rotation state of the drive shaft.

[0014] In some embodiments of the present application, the drive motor further comprises a first sealing member, the first sealing member is arranged in the first avoidance hole, and the drive shaft and the partition plate are respectively in contact with the first sealing member.

[0015] In the above embodiment, powder may be generated when the brake brakes the drive shaft. The first seal abuts the drive shaft and the partition plate respectively to seal at the first avoidance hole. When the powder moves from the third chamber to the second chamber, the first seal stops the powder from entering the second chamber through the first avoidance hole, so as to reduce the interference of the powder on the sensor, which is beneficial to improve the accuracy of the sensor in sensing the rotation state of the drive shaft.

[0016] In some embodiments of the present application, the drive control board is provided with a first blocking portion. The partition plate is provided with a second blocking portion. The first blocking portion and the second blocking portion abut and enclose to form a sensing space. The first blocking portion and the second blocking portion are configured to prevent the colloid from entering the sensing space when the colloid is poured into the second chamber. The sensor and the sensing matching portion are located in the sensing space.

[0017] In the above embodiment, the first blocking portion cooperates with the second blocking portion to separate the sensing space from other areas in the second chamber, thereby preventing the sensor and the sensing matching portion from being disturbed by the colloid when the second chamber is filled with glue, thereby improving the accuracy of the sensor in sensing the rotation state of the drive shaft.

[0018] In some embodiments of the present application, the sensor is a magnetic encoder, the sensing mating portion is a magnetic member, and the magnetic encoder is configured to sense changes in a magnetic field when the magnetic member rotates.

[0019] In the above embodiment, when the driving shaft rotates, the magnetic member rotates relative to the magnetic encoder, thereby causing a change in the magnetic field relative to the magnetic encoder. The magnetic encoder senses the change in the magnetic field to obtain the rotation state of the driving shaft.

[0020] In some embodiments of the present application, the motor housing is provided with a second avoidance hole. The drive shaft extends from the inside of the motor housing to the outside of the motor housing through the second avoidance hole. The drive motor also includes a second sealing member. The second sealing member is provided in the second avoidance hole. The motor housing and the drive shaft are respectively in contact with the second sealing member.

[0021] In the above embodiment, the drive shaft extends to the outside of the motor housing through the second avoidance hole, thereby cooperating with other structures to control the rotation of other structures. The second sealing member abuts the motor housing and the drive shaft respectively to seal at the second avoidance hole, thereby improving the sealing effect of the drive motor, reducing the possibility of external liquids, sand and gravel and other impurities entering the motor housing and affecting the operation of the drive motor, and improving the ability of the drive motor to resist external interference.

[0022] In some embodiments of the present application, the driving motor further includes a protective cover, and the motor housing is disposed inside the protective cover.

[0023] In the above embodiment, the protective cover is arranged outside the motor housing to add a protective barrier outside the motor housing, thereby improving the sealing effect of the drive motor and improving the ability of the drive motor to resist external interference.

[0024] In some embodiments of the present application, the protective cover is provided with a third avoidance hole. The drive shaft passes through the third avoidance hole. The drive motor further includes a third sealing member. The third sealing member is provided in the third avoidance hole. The protective cover and the motor housing are respectively in contact with the third sealing member.

[0025] In the above embodiment, the drive shaft passes through the third avoidance hole and cooperates with other structures to control the rotation of other structures. The third sealing member abuts the protective cover and the motor housing respectively to seal at the third avoidance hole, thereby improving the sealing effect of the drive motor, preventing external liquids, sand and gravel and other impurities from entering the protective cover and affecting the operation of the drive motor, and improving the ability of the drive motor to resist external interference.

[0026] One embodiment of the present application provides a linear drive device. The linear drive device includes a screw, a nut tube, a sleeve, a guide assembly, and a drive motor as described in any of the above embodiments. The screw is connected to a drive shaft. The drive shaft drives the screw to rotate. The nut tube is sleeved on the outside of the screw. The nut tube is threadedly connected to the screw. The sleeve is sleeved on the outside of the nut tube. The sleeve is fixedly connected to the motor housing. The guide assembly is arranged between the sleeve and the nut tube.

[0027] In the above embodiment, when the driving motor is working, the driving shaft drives the screw to rotate, thereby driving the nut tube to move along its own axial direction, thereby realizing the linear movement control of the external structure. The sleeve is arranged on the outside of the nut tube to stop liquids, sand and gravel and other impurities, thereby protecting the cooperation between the screw and the nut tube and the driving motor. The guide assembly can reduce the shaking of the nut tube relative to the sleeve, and improve the accuracy and stability of the linear drive of the nut tube to other structures. At the same time, the linear drive device controls the movement of the nut tube through the driving motor, and the driving motor itself has good sealing, thereby improving the ability of the linear drive device to resist external interference and improving the service life of the linear drive device.

[0028] In some embodiments of the present application, the guide assembly includes a guide seat, a guide member and a fourth sealing member. The guide seat is connected to the sleeve. The guide member is connected to the guide seat. The guide member abuts against the nut tube. The fourth sealing member is arranged between the nut tube and the guide seat. The nut tube and the guide seat abut against the fourth sealing member respectively. Along the extension direction of the sleeve, the fourth sealing member is farther away from the connection between the sleeve and the motor housing than the guide member.

[0029] In the above embodiment, the guide seat is connected to the sleeve, which is convenient for setting structures such as the guide member and the fourth seal, so that the guide member, the fourth seal and other structures can abut and cooperate with the nut tube. The guide member reduces the shaking of the nut tube relative to the sleeve, and improves the accuracy and stability of the movement of the nut tube. The fourth seal abuts the guide seat and the nut tube respectively to form a seal, reduce the external liquid, sand and gravel and other impurities entering the sleeve and affecting the cooperation between the screw rod and the nut tube, and can prevent impurities from entering the drive motor through the sleeve. At the same time, the guide member is also located on the side sealed and protected by the fourth seal, which improves the accuracy of the guide member in guiding the nut tube.

[0030] In some embodiments of the present application, the guide seat is provided with a receiving groove. The receiving groove is provided on the side of the guide seat facing the nut tube. The receiving groove is configured to receive a lubricating medium. The guide assembly further includes a first oil seal. The first oil seal is provided between the nut tube and the guide seat. The nut tube and the guide seat are respectively in contact with the first oil seal. Along the extension direction of the sleeve, the first oil seal is farther away from the fourth seal than the guide member; the receiving groove is located between the first oil seal and the fourth seal.

[0031] In the above embodiment, the first oil seal can stop the lubricating medium injected into the receiving groove to prevent the lubricating medium from leaking. The receiving groove can store the lubricating medium for lubrication between the guide member and the nut tube, thereby improving the service life of the guide member and the nut tube and the stability of the nut tube moving relative to the guide member. In addition, with the cooperation of the lubricating medium and the first oil seal, sealing protection can be provided when the sealing effect of the fourth sealing member is damaged.

[0032] In some embodiments of the present application, the guide assembly further includes a second oil seal. The second oil seal is disposed between the nut tube and the guide seat. The nut tube and the guide seat are respectively in contact with the second oil seal. Along the extension direction of the sleeve, the second oil seal is located between the guide member and the fourth seal. The accommodating groove is located between the first oil seal and the second oil seal.

[0033] In the above embodiment, the second oil seal cooperates with the first oil seal to prevent leakage of the lubricating medium and provide protection for the lubricating medium contained in the containing groove.

[0034] In some embodiments of the present application, the guide seat is provided with a first lubrication cavity, a second lubrication cavity and a connecting cavity. Along the extension direction of the sleeve, the first lubrication cavity is located on the side of the guide member close to the receiving groove. The first lubrication cavity is connected with the receiving groove. Along the extension direction of the sleeve, the second lubrication cavity is located on the side of the guide member away from the receiving groove. The connecting cavity connects the first lubrication cavity and the second lubrication cavity.

[0035] In the above embodiment, by providing the first lubrication cavity and the second lubrication cavity, the two opposite sides of the guide member along the moving direction of the nut tube can be lubricated by the lubricating medium, thereby improving the lubrication effect between the guide member and the nut tube. The first lubrication cavity, the second lubrication cavity and the accommodating groove are interconnected through the connecting cavity, and the guide member and the guide seat are kept fixedly connected.

[0036] In some embodiments of the present application, the fourth sealing member has a protrusion, which abuts against the nut tube and is located on a side of the fourth sealing member away from the first oil seal along the extension direction of the sleeve.

[0037] In the above embodiment, the fourth seal is provided with a protrusion, which can scrape off impurities such as mud and sand adhering to the outer surface of the nut tube when the nut tube moves relative to the sleeve, which is beneficial to prevent impurities such as mud and sand from entering the area where the lubricating medium is located, and is beneficial to prevent impurities such as mud and sand from further entering the interior of the drive motor.

[0038] An embodiment of the present application provides a lifting column device, which comprises a column housing and a linear drive device as described in any of the above embodiments, wherein the column housing is fixedly connected to a motor housing or a nut tube.

[0039] In the above embodiment, when the linear drive device is working, the nut tube moves linearly relative to the motor housing, and the column housing is connected to the motor housing or to the nut tube to achieve linear movement. At the same time, the lifting column device is moved and controlled by the linear drive device, and the linear drive device itself has good sealing performance, thereby improving the ability of the column housing to resist external interference when moving, and improving the service life of the lifting column device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0041] Figure 1 A schematic diagram of the structure of a linear drive device provided in one embodiment of the present application;

[0042] Figure 2 for Figure 1 Schematic cross-sectional view of section AA;

[0043] Figure 3 for Figure 2 A magnified view of part B;

[0044] Figure 4 for Figure 1 The structural diagram of the middle drive motor;

[0045] Figure 5 for Figure 4 Schematic cross-sectional view of the CC section;

[0046] Figure 6 for Figure 5 A schematic cross-sectional view of the motor housing;

[0047] Figure 7 for Figure 5 Magnified view of part D.

[0048] Description of main component symbols:

[0049] Drive motor 100

[0050] Motor housing 1

[0051] Housing 11

[0052] First chamber 111

[0053] Second chamber 112

[0054] The third chamber 113

[0055] Wiring channel 114

[0056] Partition 115

[0057] Cover 12

[0058] The second avoidance hole 121

[0059] Driver module 2

[0060] Drive shaft 3

[0061] Inductive mating part 31

[0062] Control Component 4

[0063] Drive control board 41

[0064] The first blocking portion 411

[0065] Sensor 42

[0066] Divider plate 43

[0067] The first avoidance hole 431

[0068] Guide section 432

[0069] Incline 4321

[0070] The second blocking portion 433

[0071] Sensing Space 44

[0072] Connection line 5

[0073] Brakes 6

[0074] Protective cover 7

[0075] The third avoidance hole 71

[0076] First sealing member 81

[0077] Second sealing member 82

[0078] The third sealing member 83

[0079] Linear drive 200

[0080] Screw 201

[0081] Nut tube 202

[0082] Casing 203

[0083] Guide assembly 204

[0084] Guide seat 2041

[0085] Accommodating groove 2041a

[0086] First lubrication chamber 2041b

[0087] Second lubrication chamber 2041c

[0088] Communication cavity 2041d

[0089] Guide 2042

[0090] Fourth seal 2043

[0091] Raised portion 2043a

[0092] First oil seal 2044

[0093] Second oil seal 2045 DETAILED DESCRIPTION

[0094] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0095] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0096] In the description of the present application, it should be noted that the terms "inside", "outside", etc. indicate orientations or positional relationships 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 device or element referred to 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.

[0097] The terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0098] In addition, the symbol "-" should be understood as including its endpoint value.

[0099] Embodiments of the present application provide a driving motor, a linear driving device and a lifting column device. The driving motor includes a motor housing, a driving module, a driving shaft, a control component and a connecting line. A first chamber, a second chamber and a wiring channel are provided inside the motor housing. Both the first chamber and the second chamber are connected to the wiring channel. The driving module is arranged in the first chamber. The driving shaft is passed from the inside of the motor housing to the outside of the motor housing and passes through at least the first chamber inside the motor housing. The driving module drives the driving shaft to rotate. The control component is arranged in the second chamber. The second chamber is configured to be able to be filled with glue to seal the control component. The connecting line passes through the wiring channel. The connecting line is connected to the driving module and the control component.

[0100] By setting the second chamber and the wiring channel inside the motor housing, the control component and the connecting wire can be set in the motor housing and protected by the motor housing. In addition, the drive module is fixed in the first chamber. After the control component is fixed in the second chamber, the connecting wire is also fixed. The assembly process of the drive motor is simple, which is conducive to reducing production costs. At the same time, the structures such as the drive module, the control component and the connecting wire are relatively fixed. On the one hand, the connecting wire is constrained in the wiring channel and is not easy to shake, so it is convenient to pour glue into the second chamber. On the other hand, the wiring channel is located at a more internal position of the motor housing than the second chamber. Even if the connecting wire shakes during glue pouring, it can only affect the glue pouring effect on the inside, and has no effect on the sealing performance on the outside. After pouring glue into the second chamber to seal and fix the control component, the wiring channel is also sealed at the same time, thereby improving the sealing effect of the drive motor. In addition, the connecting wire is inside the motor housing and is constrained by the wiring channel. The connecting wire can be in a stable and dry working environment, thereby improving the working life of the connecting wire.

[0101] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0102] See also Figure 1 One embodiment of the present application provides a lifting column device (not shown). The lifting column device includes a column housing (not shown) and a linear drive device 200. The column housing is fixedly connected to the linear drive device 200. The linear drive device 200 drives the column housing to move, thereby realizing the lifting and lowering of the column housing. The linear drive device 200 has good sealing performance, so that the ability of the column housing to resist external interference when moving can be improved, and the service life of the lifting column device can be improved.

[0103] In some embodiments, the lifting column device is arranged underground when in use. As an exemplary example, the lifting column device can be arranged at a location such as an entrance and exit of a pedestrian street.

[0104] See also Figure 1 , Figure 2 and Figure 5 In some embodiments, the linear drive device 200 includes a screw 201, a nut tube 202, a sleeve 203, a guide assembly 204 and a drive motor 100. The screw 201 is connected to the drive shaft 3 of the drive motor 100. The drive shaft 3 drives the screw 201 to rotate. The nut tube 202 is sleeved on the outside of the screw 201. The nut tube 202 is threadedly connected to the screw 201. The sleeve 203 is sleeved on the outside of the nut tube 202. The sleeve 203 is fixedly connected to the motor housing 1 of the drive motor 100. The guide assembly 204 is arranged between the sleeve 203 and the nut tube 202.

[0105] When the drive motor 100 is working, the drive shaft 3 drives the screw 201 to rotate, thereby driving the nut tube 202 to move along its own axial direction, thereby realizing the linear movement control of the external structure. The sleeve 203 is sleeved on the outside of the nut tube 202 to stop liquids, sand and gravel and other impurities, thereby protecting the cooperation between the screw 201 and the nut tube 202 and the drive motor 100. The guide component 204 can reduce the shaking of the nut tube 202 relative to the sleeve 203, and improve the accuracy and stability of the linear drive of the nut tube 202 to other structures. At the same time, the linear drive device 200 controls the movement of the nut tube 202 through the drive motor 100, and the drive motor 100 itself has good sealing, thereby improving the ability of the linear drive device 200 to resist external interference and improving the service life of the linear drive device 200.

[0106] In some embodiments, the column housing is fixedly connected to the motor housing 1 or the nut tube 202. When the linear drive device 200 is working, the nut tube 202 moves linearly relative to the motor housing 1, and the column housing is connected to the motor housing 1 or the nut tube 202 to achieve linear movement.

[0107] When the column housing is fixedly connected to the motor housing 1, the height of the nut tube 202 relative to the ground remains unchanged, while the height of the motor housing 1 relative to the ground changes, thereby driving the column housing to rise and fall. When the column housing is fixedly connected to the nut tube 202, the height of the motor housing 1 relative to the ground remains unchanged, while the height of the nut tube 202 relative to the ground changes, thereby driving the column housing to rise and fall.

[0108] See also Figure 1 and Figure 2 In some embodiments, the screw rod 201 is fixedly connected to the driving shaft 3 of the driving motor 100 to enhance the stability of the cooperation between the screw rod 201 and the driving motor 100 .

[0109] In some embodiments, the screw rod 201 is connected to the drive shaft 3 of the drive motor 100 through a bevel gear (not shown), so that the setting direction of the drive motor 100 can be changed, which is beneficial to shortening the extension length of the linear drive device 200 in the moving direction of the nut tube 202. When the linear drive device 200 is used to drive the column housing of the lifting column device to move, it is beneficial to reduce the overall height of the lifting column device, thereby reducing the excavation depth for setting the lifting column device.

[0110] In other embodiments, the sleeve 203 and the guide assembly 204 may be omitted.

[0111] In some embodiments, the linear drive device 200 can be used to drive other equipment. In particular, for other equipment working underground or underwater and facing the risk of water ingress, the linear drive device 200 can achieve an IP68 waterproof rating. As an illustrative example, the linear drive device 200 can also be used for telescopic equipment that needs to be submerged.

[0112] See also Figure 2 and Figure 3 In some embodiments, the guide assembly 204 includes a guide seat 2041, a guide member 2042 and a fourth sealing member 2043. The guide seat 2041 is connected to the sleeve 203. The guide member 2042 is connected to the guide seat 2041. The guide member 2042 abuts against the nut tube 202. The fourth sealing member 2043 is arranged between the nut tube 202 and the guide seat 2041. The nut tube 202 and the guide seat 2041 abut against the fourth sealing member 2043 respectively. Along the extension direction of the sleeve 203, the fourth sealing member 2043 is farther away from the connection between the sleeve 203 and the motor housing 1 than the guide member 2042.

[0113] The guide seat 2041 is connected to the sleeve 203, which is convenient for setting the guide member 2042, the fourth seal member 2043 and other structures, so that the guide member 2042, the fourth seal member 2043 and other structures can be abutted and matched with the nut tube 202. The guide member 2042 reduces the shaking of the nut tube 202 relative to the sleeve 203, and improves the precision and stability of the movement of the nut tube 202. The fourth seal member 2043 abuts the guide seat 2041 and the nut tube 202 respectively to form a seal, reduce the external liquid, sand and other impurities entering the sleeve 203 and affecting the cooperation between the screw rod 201 and the nut tube 202, and can stop the possibility of impurities entering the interior of the drive motor 100 through the sleeve 203. At the same time, the guide member 2042 is also located on the side sealed and protected by the fourth seal member 2043, which improves the precision of the guide member 2042 in guiding the nut tube 202.

[0114] See also Figure 2 and Figure 3 In some embodiments, one end of the sleeve 203 is connected to the driving motor 100 , and the other end of the sleeve 203 is provided with a guide seat 2041 .

[0115] In some embodiments, the fourth sealing member 2043 is made of rubber or other materials to maintain a good sealing effect.

[0116] See also Figure 3 In some embodiments, the guide seat 2041 is provided with a receiving groove 2041a. The receiving groove 2041a is provided on the side of the guide seat 2041 facing the nut tube 202. The receiving groove 2041a is configured to accommodate a lubricating medium (not shown). The guide assembly 204 also includes a first oil seal 2044. The first oil seal 2044 is provided between the nut tube 202 and the guide seat 2041. The nut tube 202 and the guide seat 2041 abut against the first oil seal 2044 respectively. Along the extension direction of the sleeve 203, the first oil seal 2044 is farther away from the fourth seal 2043 than the guide member 2042; the receiving groove 2041a is located between the first oil seal 2044 and the fourth seal 2043. In some embodiments, the lubricating medium can be lubricating oil or grease.

[0117] The first oil seal 2044 can stop the lubricating medium injected into the receiving groove 2041a to prevent the lubricating medium from leaking. The receiving groove 2041a can store the lubricating medium for lubrication between the guide member 2042 and the nut tube 202, thereby improving the service life of the guide member 2042 and the nut tube 202 and improving the stability of the nut tube 202 moving relative to the guide member 2042. In addition, with the cooperation of the lubricating medium and the first oil seal 2044, sealing protection can be provided when the sealing effect of the fourth sealing member 2043 is damaged.

[0118] See also Figure 3In some embodiments, the guide assembly 204 further includes a second oil seal 2045. The second oil seal 2045 is disposed between the nut tube 202 and the guide seat 2041. The nut tube 202 and the guide seat 2041 are respectively in contact with the second oil seal 2045. Along the extension direction of the sleeve 203, the second oil seal 2045 is located between the guide member 2042 and the fourth seal 2043. The accommodating groove 2041a is located between the first oil seal 2044 and the second oil seal 2045.

[0119] The second oil seal 2045 cooperates with the first oil seal 2044 to prevent leakage of the lubricating medium, provide protection for the lubricating medium contained in the containing groove 2041 a, and further improve the sealing effect by providing the second oil seal 2045 .

[0120] See also Figure 3 In some embodiments, the first oil seal 2044 and the second oil seal 2045 both have openings. Along the extension direction of the sleeve 203, the openings of the first oil seal 2044 and the second oil seal 2045 are both oriented toward the receiving groove 2041a, which can increase the storage capacity of the lubricating medium compared to the opening of the first oil seal 2044 or the opening of the second oil seal 2045 being away from the receiving groove 2041a.

[0121] In other embodiments, the second oil seal 2045 may be omitted.

[0122] See also Figure 3 In some embodiments, the fourth sealing member 2043 has a protrusion 2043a. The protrusion 2043a abuts against the nut tube 202. Along the extension direction of the sleeve 203, the protrusion 2043a is located on a side of the fourth sealing member 2043 away from the first oil seal 2044.

[0123] The fourth seal 2043 is provided with a protrusion 2043a, which can scrape off impurities such as mud and sand adhering to the outer surface of the nut tube 202 when the nut tube 202 moves relative to the sleeve 203, which is beneficial to prevent impurities such as mud and sand from entering the area where the lubricating medium is located, and is beneficial to prevent impurities such as mud and sand from further entering the interior of the drive motor 100.

[0124] See also Figure 3 In some embodiments, the guide seat 2041 is provided with a first lubrication cavity 2041b, a second lubrication cavity 2041c and a connecting cavity 2041d. Along the extension direction of the sleeve 203, the first lubrication cavity 2041b is located on the side of the guide member 2042 close to the receiving groove 2041a. The first lubrication cavity 2041b is connected with the receiving groove 2041a. Along the extension direction of the sleeve 203, the second lubrication cavity 2041c is located on the side of the guide member 2042 away from the receiving groove 2041a. The connecting cavity 2041d connects the first lubrication cavity 2041b and the second lubrication cavity 2041c.

[0125] By providing the first lubrication cavity 2041b and the second lubrication cavity 2041c, the two opposite sides of the guide member 2042 along the moving direction of the nut tube 202 can be lubricated by the lubricating medium, thereby improving the lubrication effect between the guide member 2042 and the nut tube 202. The first lubrication cavity 2041b, the second lubrication cavity 2041c and the accommodating groove 2041a are interconnected through the connecting cavity 2041d, and the guide member 2042 is fixedly connected to the guide seat 2041.

[0126] See also Figure 4 and Figure 5 In some embodiments, the driving motor 100 includes a motor housing 1, a driving module 2, a driving shaft 3, a control component 4 and a connecting line 5. The driving module 2, the control component 4 and the connecting line 5 are all arranged in the motor housing 1. The driving shaft 3 is passed from the inside of the motor housing 1 to the outside of the motor housing 1. The connecting line 5 is connected to the driving module 2 and the control component 4. The control component 4 controls the driving module 2, and the driving module 2 drives the driving shaft 3 to rotate.

[0127] See also Figure 5 and Figure 6 In some embodiments, a first chamber 111 is provided inside the motor housing 1 . The driving module 2 is provided in the first chamber 111 . The driving shaft 3 at least passes through the first chamber 111 inside the motor housing 1 .

[0128] See also Figure 5 and Figure 6 In some embodiments, a second chamber 112 is provided inside the motor housing 1. The second chamber 112 is configured to be able to be filled with glue to seal the control component 4. In some embodiments, the colloid used for the glue filling can be a sealant or a resin.

[0129] See also Figure 5 and Figure 6 In some embodiments, a wiring channel 114 is provided inside the motor housing 1 . The first chamber 111 and the second chamber 112 are both connected to the wiring channel 114 . The control component 4 is disposed in the second chamber 112 . The connecting wire 5 passes through the wiring channel 114 .

[0130] By setting the second chamber 112 and the wiring channel 114 inside the motor housing 1, the control component 4 and the connecting wire 5 can be set in the motor housing 1 and protected by the motor housing 1. In addition, the driving module 2 is fixed in the first chamber 111. After the control component 4 is fixed in the second chamber 112, the connecting wire 5 is also fixed. The assembly process of the drive motor 100 is simple, which is conducive to reducing production costs. At the same time, the structures such as the driving module 2, the control component 4 and the connecting wire 5 are relatively fixed. On the one hand, the connecting wire 5 is constrained in the wiring channel 114 and is not easy to shake, so it is convenient to pour glue into the second chamber 112. On the other hand, the wiring channel 114 is located at a more internal position of the motor housing 1 than the second chamber 112. Even if the connecting wire 5 shakes during glue pouring, it can only affect the glue pouring effect on the inside, and has no effect on the sealing performance of the outside. After pouring glue into the second chamber 112 to seal and fix the control component 4, the wiring channel 114 is also sealed at the same time, thereby improving the sealing effect of the drive motor 100. Furthermore, the connecting wire 5 is inside the motor housing 1 and is constrained by the wiring channel 114, so that the connecting wire 5 can be in a stable and dry working environment, thereby increasing the working life of the connecting wire 5. The control component 4 is sealed at the second chamber 112 by means of glue injection, and the glue injected can improve the heat dissipation effect of the control component 4 and the connecting wire 5, thereby improving the working environment of the drive motor 100.

[0131] It is understandable that in some embodiments, before the second chamber 112 is filled with glue, the control component 4 is fixed to the second chamber 112 by a fastening structure such as screws and buckles.

[0132] See also Figure 5 and Figure 6 In some embodiments, the drive motor 100 further includes a brake 6. The brake 6 is configured to brake the rotation of the drive shaft 3. The connecting line 5 is connected to the brake 6. The brake 6 is connected to the control component 4 through the connecting line 5, so as to cooperate with the drive module 2 to control the rotation position of the drive shaft 3. After the drive module 2 drives the drive shaft 3 to rotate forward to the right position, the drive shaft 3 is braked by the brake 6 to prevent the drive shaft 3 from being driven by the connected structure to rotate in the opposite direction, thereby improving the working stability of the drive motor 100.

[0133] See also Figure 5 and Figure 6 In some embodiments, a third chamber 113 is provided inside the motor housing 1. The third chamber 113 is communicated with the wiring channel 114. The brake 6 is provided in the third chamber 113. By providing the third chamber 113, it is convenient to constrain the position of the brake 6, and further facilitates the brake 6 to brake the drive shaft 3 stably.

[0134] See also Figure 2 and Figure 5In some embodiments, when the driving motor 100 drives the nut tube 202 to move, and then drives the column housing to move through the nut tube 202, the driving motor 100 lifts the nut tube 202 and the column housing, and the brake 6 can lock the driving shaft 3, thereby reducing the possibility that the nut tube 202 or the column housing drives the driving shaft 3 to reverse under the action of gravity. In other embodiments, the brake 6 and the third chamber 113 can be omitted. The screw rod 201 adopts a structure with a self-locking function such as a trapezoidal screw rod.

[0135] See also Figure 5 and Figure 6 In some embodiments, the motor housing 1 includes a housing 11 and a cover 12. The first chamber 111, the second chamber 112, the third chamber 113 and the wiring channel 114 are arranged in the housing 11. Along the axial direction of the drive shaft 3, the first chamber 111, the third chamber 113 and the second chamber 112 are sequentially distributed. The housing 11 is provided with a partition 115, and the partition 115 separates the first chamber 111 and the third chamber 113. The first chamber 111 is connected to the outside of the housing 11, which is convenient for loading the drive module 2 into the first chamber 111. The cover 12 is arranged on the side of the first chamber 111 of the housing 11, so as to seal the drive module 2 inside. The second chamber 112 is connected to the outside of the housing 11, and the brake 6 is assembled before the control component 4. After the control component 4 is loaded into the second chamber 112, glue is poured into the second chamber 112 to fix and seal the control component 4.

[0136] In other embodiments, the first chamber 111 , the second chamber 112 , and the third chamber 113 can exchange positions.

[0137] In some embodiments, the housing 11 is an integral die-cast structure.

[0138] See also Figure 5 and Figure 6 In some embodiments, the motor housing 1 is provided with a second avoidance hole 121. The drive shaft 3 extends from the inside of the motor housing 1 to the outside of the motor housing 1 through the second avoidance hole 121. The drive motor 100 also includes a second sealing member 82. The second sealing member 82 is provided in the second avoidance hole 121. The motor housing 1 and the drive shaft 3 are respectively in contact with the second sealing member 82. In some embodiments, the second avoidance hole 121 is provided in the cover body 12.

[0139] The drive shaft 3 extends to the outside of the motor housing 1 through the second avoidance hole 121, thereby cooperating with other structures to control the rotation of other structures. The second sealing member 82 abuts against the motor housing 1 and the drive shaft 3 respectively to seal at the second avoidance hole 121, thereby improving the sealing effect of the drive motor 100, preventing external liquids, sand and gravel and other impurities from entering the motor housing 1 and affecting the operation of the drive motor 100, and improving the ability of the drive motor 100 to resist external interference.

[0140] See also Figure 4 and Figure 5 In some embodiments, the drive motor 100 further includes a protective cover 7. The motor housing 1 is disposed in the protective cover 7. The protective cover 7 is disposed outside the motor housing 1 to provide an additional protective barrier outside the motor housing 1, thereby improving the sealing effect of the drive motor 100 and improving the ability of the drive motor 100 to resist external interference.

[0141] See also Figure 2 In some embodiments, the motor housing 1 is fixedly connected to the protective cover 7, thereby being connected to the column housing and the sleeve 203. In other embodiments, the protective cover 7 can be omitted.

[0142] See also Figure 4 and Figure 5 In some embodiments, the protective cover 7 is provided with a third avoidance hole 71. The drive shaft 3 passes through the third avoidance hole 71. The drive motor 100 further includes a third sealing member 83. The third sealing member 83 is provided in the third avoidance hole 71. The protective cover 7 and the motor housing 1 are respectively in contact with the third sealing member 83.

[0143] The drive shaft 3 passes through the third avoidance hole 71 and cooperates with other structures to control the rotation of other structures. The third sealing member 83 abuts the protective cover 7 and the motor housing 1 respectively to seal at the third avoidance hole 71, thereby improving the sealing effect of the drive motor 100, preventing the possibility that external liquids, sand and gravel and other impurities enter the protective cover 7 and affect the operation of the drive motor 100, and improving the resistance of the drive motor 100 to external interference.

[0144] See also Figure 4 and Figure 5 In some embodiments, the third seal 83 abuts against the protective cover 7 and the motor housing 1 while abutting against the drive shaft 3 to further enhance the sealing effect of the drive motor 100 and prevent external liquids, sand and other impurities from entering the motor housing 1 and affecting the operation of the drive motor 100.

[0145] See also Figure 5 In some embodiments, the second sealing member 82 abuts against the portion of the drive shaft 3 located inside the motor housing 1 , and the third sealing member 83 abuts against the portion of the drive shaft 3 located outside the motor housing 1 .

[0146] In some embodiments, the second seal 82 and the third seal 83 are made of carbon fiber, which has good wear resistance while maintaining a good sealing effect, and has a small friction with the drive shaft 3. The cross-sections of the second seal 82 and the third seal 83 are both approximately U-shaped, so that sufficient pressure can be provided in the radial direction of the drive shaft 3 to maintain the sealing effect.

[0147] See also Figure 5 and Figure 7In some embodiments, the control assembly 4 includes a drive control board 41 and a sensor 42. The drive control board 41 is connected to the connecting line 5. The sensor 42 is disposed on the drive control board 41. The sensor 42 is configured to sense the rotation state of the drive shaft 3 and transmit it to the drive control board 41.

[0148] The drive control board 41 controls the drive module 2, thereby controlling the rotation of the drive shaft 3. The sensor 42 senses the rotation state of the drive shaft 3 and provides it to the drive control board 41, so that the drive control board 41 can control the drive module 2 to improve the accuracy of the rotation control of the drive shaft 3, which is conducive to improving the working stability of the drive motor 100.

[0149] See also Figure 5 and Figure 7 In some embodiments, the control assembly 4 further includes a partition plate 43. The drive control board 41 is connected to the partition plate 43. The partition plate 43 separates the second chamber 112 from the third chamber 113.

[0150] The second chamber 112 and the third chamber 113 are separated by the partition plate 43. When the control component 4 is not installed in the second chamber 112, the second chamber 112 and the third chamber 113 are connected, which is convenient for installing the control component 4 and the brake 6 into the second chamber 112 and the third chamber 113 respectively. After the partition plate 43 is assembled in place, when the glue is poured into the second chamber 112, it is helpful to prevent the glue from entering the third chamber 113. The driving control board 41 is connected to the partition plate 43, which improves the stability of the internal structure of the control component 4 and facilitates the glue filling and sealing in the second chamber 112.

[0151] See also Figure 5 and Figure 7 In some embodiments, the partition plate 43 is provided with a first avoidance hole 431. The drive shaft 3 passes through the partition plate 43 through the first avoidance hole 431. The drive shaft 3 is provided with a sensing matching portion 31. The sensing matching portion 31 is located between the partition plate 43 and the drive control board 41. The sensor 42 is configured to sense the rotation state of the sensing matching portion 31.

[0152] The sensor 42 senses the rotation state of the sensing mating portion 31 to obtain the rotation state of the entire drive shaft 3. The sensing mating portion 31 is arranged between the partition plate 43 and the drive control board 41 to shorten the distance between the sensing mating portion 31 and the sensor 42, thereby improving the accuracy of the sensor 42 in sensing the rotation state of the drive shaft 3.

[0153] See also Figure 5 and Figure 7 In some embodiments, the sensor 42 is a magnetic encoder. The sensing mating portion 31 is a magnetic member. The magnetic encoder is configured to sense changes in the magnetic field when the magnetic member rotates.

[0154] When the drive shaft 3 rotates, the magnetic element rotates relative to the magnetic encoder, thereby causing a change in the magnetic field relative to the magnetic encoder. The magnetic encoder obtains the rotation state of the drive shaft 3 by sensing the change in the magnetic field.

[0155] See also Figure 5 and Figure 7 In some embodiments, the magnetic member is disposed at the end of the drive shaft 3. The magnetic encoder is disposed on the side of the drive control board 41 facing the partition plate 43. The distance between the magnetic member and the magnetic encoder is about 1-2 mm. In other embodiments, the magnetic member is annular and sleeved on the outer side of the drive shaft 3, the drive control board 41 is provided with a fourth avoidance hole, and the magnetic encoder is disposed at the edge of the fourth avoidance hole.

[0156] In other embodiments, the sensor 42 may be a light barrier.

[0157] See also Figure 5 and Figure 7 In some embodiments, the partition plate 43 is provided with a guide portion 432. The guide portion 432 is provided on the peripheral side of the first avoidance hole 431. The guide portion 432 is located on a side of the partition plate 43 facing the third chamber 113.

[0158] When the brake 6 brakes the drive shaft 3, powder may be generated. The guide portion 432 is set on the side facing the third chamber 113. When the powder moves from the third chamber 113 to the second chamber 112, the guide portion 432 guides the powder in a direction away from the first avoidance hole 431, thereby reducing the possibility of the powder entering the second chamber 112 through the first avoidance hole 431, so as to reduce the interference of the powder on the sensor 42, which is beneficial to improving the accuracy of the sensor 42 in sensing the rotation state of the drive shaft 3.

[0159] See also Figure 5 and Figure 7 In some embodiments, the guide portion 432 has an inclined surface 4321. The inclined surface 4321 extends in the radial direction of the drive shaft 3. In addition, along the radial direction of the drive shaft 3, the inclined surface 4321 gradually deviates toward the brake 6 along the direction close to the first avoidance hole 431.

[0160] See also Figure 5 and Figure 7 In some embodiments, the driving motor 100 further includes a first sealing member 81. The first sealing member 81 is disposed in the first avoidance hole 431. The driving shaft 3 and the partition plate 43 are respectively in contact with the first sealing member 81.

[0161] When the brake 6 brakes the drive shaft 3, powder may be generated. The first seal 81 abuts against the drive shaft 3 and the first seal 81 respectively to seal at the first avoidance hole 431. When the powder moves from the third chamber 113 to the second chamber 112, the first seal 81 stops the powder from entering the second chamber 112 through the first avoidance hole 431, so as to reduce the interference of the powder on the sensor 42, which is beneficial to improve the accuracy of the sensor 42 in sensing the rotation state of the drive shaft 3.

[0162] See also Figure 5 and Figure 7 In some embodiments, along the axial direction of the drive shaft 3, the first seal 81 is closer to the drive control board 41 than the guide portion 432. In some embodiments, the first seal 81 is a bearing, which can block dust and improve the stability of the rotation of the drive shaft 3, and is cheaper than carbon fiber materials.

[0163] See also Figure 5 and Figure 7 In some embodiments, the driving control board 41 is provided with a first blocking portion 411. The partition plate 43 is provided with a second blocking portion 433. The first blocking portion 411 and the second blocking portion 433 abut and enclose to form a sensing space 44. The first blocking portion 411 and the second blocking portion 433 are configured to prevent the glue from entering the sensing space 44 when the glue is poured into the second chamber 112. The sensor 42 and the sensing matching portion 31 are located in the sensing space 44.

[0164] The first blocking portion 411 cooperates with the second blocking portion 433 to separate the sensing space 44 from other areas in the second chamber 112, thereby reducing the possibility of the sensor 42 and the sensing matching portion 31 being disturbed by the glue when the second chamber 112 is filled with glue, and improving the accuracy of the sensor 42 in sensing the rotation state of the driving shaft 3.

[0165] See also Figures 5 to 7 In some embodiments, the guide assembly 204 forms four layers of protection by providing structures such as a fourth seal 2043, a second oil seal 2045, a lubricating medium and a first oil seal 2044 to achieve the first level of waterproof protection. By providing the second seal 82 and the third seal 83, a seal is performed between the inside of the motor housing 1 and the outside of the motor housing 1. Even if impurities such as liquid enter the sleeve 203, they cannot enter the inside of the motor housing 1, thereby achieving the second level of waterproof protection. By filling the second chamber 112 with glue, the control assembly 4 and the connecting line 5 are sealed and protected to achieve the third level of waterproof protection. Through multi-level waterproof protection, the drive motor 100, the linear drive device 200 and the lifting column equipment can be immersed in water for a long time and operate stably, thereby improving the working stability and working life.

[0166] The drive motor 100, the linear drive device 200 and the lifting column equipment of the present application have a simple manufacturing process, low cost, high control accuracy, low heat generation, excellent waterproof performance, and can be operated stably in water for a long time through the design of partition coordination within the motor housing and multi-level waterproof protection.

[0167] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A driving motor, characterized in that: include: A motor housing, wherein a first chamber, a second chamber and a wiring channel are provided inside, and the first chamber and the second chamber are both connected to the wiring channel; A driving module, disposed in the first chamber; A drive shaft is arranged from the inside of the motor housing to the outside of the motor housing and passes through at least the first chamber inside the motor housing, and the drive module drives the drive shaft to rotate; A control component is disposed in the second chamber, and the second chamber is configured to be capable of being filled with glue to seal the control component; A connecting line passes through the wiring channel, and the connecting line is connected to the driving module and the control component.

2. The drive motor according to claim 1, characterized in that: The control component includes a drive control board and a sensor. The drive control board is connected to the connecting line. The sensor is arranged on the drive control board. The sensor is configured to sense the rotation state of the drive shaft and transmit it to the drive control board.

3. The drive motor according to claim 2, characterized in that: A third chamber is also provided inside the motor housing, and the third chamber is communicated with the wiring channel. The control component also includes a partition plate, and the drive control board is connected to the partition plate, and the partition plate separates the second chamber and the third chamber. The drive motor also includes a brake, and the brake is provided in the third chamber. The brake is configured to brake the rotation of the drive shaft, and the brake is connected to the control component through the connecting line.

4. The drive motor according to claim 3, characterized in that: The partition plate is provided with a first avoidance hole, and the drive shaft passes through the partition plate through the first avoidance hole. The drive shaft is provided with a sensing matching part, and the sensing matching part is located between the partition plate and the drive control board. The sensor is configured to sense the rotation state of the sensing matching part.

5. The driving motor according to claim 4, characterized in that: The partition plate is provided with a guide portion, the guide portion is provided on the peripheral side of the first avoidance hole, and the guide portion is located on a side of the partition plate facing the third chamber.

6. The driving motor according to claim 4, characterized in that: The drive motor further includes a first seal, which is disposed in the first avoidance hole, and the drive shaft and the partition plate are respectively in contact with the first seal.

7. The driving motor according to claim 4, characterized in that: The drive control board is provided with a first blocking portion, and the partition plate is provided with a second blocking portion. The first blocking portion and the second blocking portion abut against and enclose a sensing space. The first blocking portion and the second blocking portion are configured to prevent the colloid from entering the sensing space when the glue is poured into the second chamber. The sensor and the sensing matching portion are located in the sensing space.

8. The driving motor according to claim 4, characterized in that: The sensor is a magnetic encoder, the sensing matching portion is a magnetic member, and the magnetic encoder is configured to sense changes in the magnetic field when the magnetic member rotates.

9. The drive motor according to any one of claims 1 to 8, characterized in that: The motor housing is provided with a second avoidance hole, and the drive shaft extends from the inside of the motor housing to the outside of the motor housing through the second avoidance hole. The drive motor also includes a second seal, which is provided in the second avoidance hole. The motor housing and the drive shaft are respectively in contact with the second seal.

10. The drive motor according to any one of claims 1 to 8, characterized in that: The driving motor further comprises a protective cover, and the motor housing is arranged inside the protective cover.

11. The driving motor according to claim 10, characterized in that: The protective cover is provided with a third avoidance hole, the drive shaft passes through the third avoidance hole, the drive motor also includes a third seal, the third seal is provided in the third avoidance hole, and the protective cover and the motor housing are respectively in contact with the third seal.

12. A linear drive device, characterized in that: It includes a screw rod, a nut tube, a sleeve, a guide assembly and a driving motor as described in any one of claims 1 to 11, the screw rod is connected to the driving shaft, the driving shaft drives the screw rod to rotate, the nut tube is sleeved on the outside of the screw rod, the nut tube is threadedly connected to the screw rod, the sleeve is sleeved on the outside of the nut tube, the sleeve is fixedly connected to the motor housing, and the guide assembly is arranged between the sleeve and the nut tube.

13. The linear drive device according to claim 12, characterized in that: The guide assembly includes a guide seat, a guide member and a fourth seal, wherein the guide seat is connected to the sleeve, the guide member is connected to the guide seat, the guide member abuts against the nut tube, the fourth seal is arranged between the nut tube and the guide seat, and the nut tube and the guide seat abut against the fourth seal respectively. Along the extension direction of the sleeve, the fourth sealing member is farther away from the connection point between the sleeve and the motor housing than the guide member.

14. The linear drive device according to claim 13, characterized in that: The guide seat is provided with a receiving groove, the receiving groove is provided on a side of the guide seat facing the nut tube, the receiving groove is configured to receive a lubricating medium, the guide assembly further comprises a first oil seal, the first oil seal is provided between the nut tube and the guide seat, the nut tube and the guide seat are respectively in contact with the first oil seal, Along the extension direction of the sleeve, the first oil seal is farther away from the fourth seal than the guide member, and the accommodating groove is located between the first oil seal and the fourth seal.

15. The linear drive device according to claim 14, characterized in that: The guide assembly further includes a second oil seal, which is disposed between the nut tube and the guide seat, and the nut tube and the guide seat are respectively in contact with the second oil seal. Along the extending direction of the sleeve, the second oil seal is located between the guide member and the fourth seal, and the accommodating groove is located between the first oil seal and the second oil seal.

16. The linear drive device according to claim 14, characterized in that: The guide seat is provided with: A first lubrication cavity, along the extension direction of the sleeve, the first lubrication cavity is located on a side of the guide member close to the receiving groove, and the first lubrication cavity is communicated with the receiving groove; a second lubrication cavity, along the extension direction of the sleeve, the second lubrication cavity being located on a side of the guide member away from the accommodating groove; A connecting cavity connects the first lubrication cavity and the second lubrication cavity.

17. The linear drive device according to any one of claims 14 to 16, characterized in that: The fourth sealing member has a protrusion, and the protrusion abuts against the nut tube. Along the extending direction of the sleeve, the protrusion is located on a side of the fourth sealing component facing away from the first oil seal.

18. A lifting column device, characterized in that: It comprises a column housing and a linear drive device as claimed in any one of claims 12 to 17, wherein the column housing is fixedly connected to the motor housing or the nut tube.

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