Linear motor and device using the same

Abstract

The present invention relates to the field of lifting technology, and provides a linear motor and a device using the linear motor, wherein the linear motor comprises a fixed screw with a hollow structure, and a first external thread is provided on its outer surface; a transmission assembly, which comprises a transmission screw and a transmission nut, both of which are hollow structures, and the transmission assembly is sleeved on the fixed screw, and the first internal thread matches the first external thread; the outer surface of the transmission screw is provided with a second external thread; and a driving mechanism, which is placed in the fixed screw, and its power output end is connected to the transmission assembly; a first outer tube, which is sleeved on the fixed screw and fixed to one end of the fixed screw; a second outer tube, which is located inside the first outer tube and sleeved on the transmission screw and connected to the transmission screw; and a third outer tube, which is located inside the second outer tube and connected to the second external thread. The linear motor provided by the present invention can effectively improve the lifting efficiency of the linear motor, and at the same time, the overall integration degree is high and the overall volume is smaller.

Description

Technical Field

[0001] The present invention relates to the field of lifting technology, and in particular to a linear motor and a device using the linear motor. Background Art

[0002] Linear motors often use a combination of screws and nuts to drive the lifting of components such as outer tubes. They are often used in devices that need to achieve lifting functions, such as lifting tables, lifting chairs, lifting platforms, and lifting equipment.

[0003] Existing linear motors usually have multiple outer tubes to achieve multiple lifting. However, the transmission device of the linear motor usually drives the motor step by step, so that the outer tube and other components are lifted and lowered step by step, resulting in low lifting efficiency. In addition, the driving motor of the linear motor is mostly externally mounted, which also makes the overall volume of the linear motor larger and limits the occasions where it can be used. Summary of the invention

[0004] One object of the present invention is to provide a linear motor to improve the technical problems of low lifting efficiency and large overall volume in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present application provides a linear motor, the linear motor comprising:

[0007] A fixed screw, the interior of the fixed screw is hollow and the outer surface is provided with a first external thread; a transmission assembly, the transmission assembly includes a transmission screw, both of which are hollow structures, and a transmission nut arranged at one end of the transmission screw, the transmission screw and the transmission nut are sleeved on the fixed screw, and the internal thread of the transmission nut matches the first external thread; the outer surface of the transmission screw is provided with a second external thread; a screw nut, the screw nut is sleeved on the outer side of the transmission screw and is adapted to the second external thread; a driving mechanism, the driving mechanism is placed in the fixed screw, and the power output end of the driving mechanism is connected to the transmission assembly for driving the transmission assembly to rotate relative to the fixed screw; a first outer tube, the first outer tube is sleeved on the fixed screw; a second outer tube, the second outer tube is located inside the first outer tube and sleeved on the transmission screw, the second outer tube is connected to the transmission screw so as to be able to move with the transmission screw; and a third outer tube, the third outer tube is located inside the second outer tube, and the third outer tube is connected to the outer side of the screw nut.

[0008] Beneficial effects of the present invention: The linear motor provided by the present invention is provided with a fixed screw, a transmission assembly, a driving mechanism, a screw nut, a first outer tube, a second outer tube and a third outer tube, wherein the transmission assembly includes a transmission screw and a transmission nut both of which are hollow structures, the inner surface of the transmission nut is provided with an internal thread, and the outer surface of the fixed screw is provided with a first external thread, the screw nut is sleeved on the outer side of the transmission screw and matched with the second external thread, the third outer tube, the second outer tube and the first outer tube are sleeved in sequence from the inside to the outside, and the first outer tube is fixed to the fixed screw, the second outer tube is connected to the transmission screw of the transmission assembly, and the third outer tube is connected to the outer side of the screw nut, and is driven by the driving mechanism The dynamic transmission component rotates relative to the fixed screw, and the transmission component simultaneously performs linear motion along the axial direction of the fixed screw under the cooperation of the internal thread of the transmission nut and the first external thread. The transmission screw drives the second outer tube and the third outer tube to rise and fall relative to the first outer tube. At the same time, the screw nut is sleeved on the transmission screw, and the inner surface of the screw nut is provided with an internal thread. The screw nut can be limited by a linear motor to limit the rotation of the screw nut. The transmission screw can drive the screw nut to move along the axial direction of the transmission screw through the second external thread; the third outer tube can be connected to the screw nut so that it can move along the axial direction of the transmission screw with the screw nut, so that it can be raised and lowered relative to the second outer tube. At the same time, the driving device is placed in the fixed screw, which can improve the stability and convenience of the placement of the driving mechanism. In this way, the overall structure is compact, the linear motor is more integrated, the overall volume is smaller, and the distance between the fixed screw and the end of the transmission assembly close to the same end of the driving mechanism is relatively short, which is conducive to shortening the length of the linear motor after it is fully retracted; and, it does not occupy external space, which can improve space utilization, and the matching distance between the power output end of the driving mechanism and the transmission assembly is shorter, which is more conducive to driving the transmission assembly to rotate relative to the fixed screw, which can shorten the connection matching length between the driving mechanism and the transmission assembly and improve transmission stability.

[0009] In one embodiment, the hand direction of the second external thread is opposite to the hand direction of the first external thread.

[0010] In one embodiment, the inner surface of the transmission screw is provided with a first limiting portion along the axial direction of the transmission screw, and the driving mechanism includes: a power part, which is fixed in the fixed screw, and the power part has a power output shaft extending out of the fixed screw; and a linkage part, which is fixed to the power output shaft and is located inside the transmission screw, and the linkage part has a first limiting fitting part, and the first limiting fitting part is slidably fitted with the first limiting part.

[0011] In one embodiment, the linear motor further includes: a control board, wherein the control board is disposed in the fixed screw rod, and the control board is electrically connected to the power unit.

[0012] In one embodiment, the linear motor also includes: a mounting cylinder, which is arranged inside the fixed screw; and a control board, which is arranged inside the mounting cylinder, and the control board is electrically connected to the power unit for controlling the power unit; wherein the mounting cylinder includes: a cylinder body; a first support part, which is connected to one end of the cylinder body; and a second support part, which is connected to the other end of the cylinder body; wherein the control board is located inside the cylinder body, and the two ends of the control board are respectively connected to the first support part and the second support part.

[0013] In one embodiment, the transmission nut of the transmission assembly has a base section, and the linear motor further includes: a bearing, wherein the bearing is located between the second outer tube and the transmission assembly and connected to the base section, and a guide portion is provided on the outer edge of the bearing; wherein the outer surface of the guide portion and / or the second outer tube cooperates with the inner surface of the first outer tube to limit the relative rotation of the guide portion and the first outer tube.

[0014] In one embodiment, the linear motor further includes a power supply assembly, which is disposed inside the first outer tube and is electrically connected to the driving mechanism; and / or, a connecting piece is sealed at the end of the third outer tube; and / or, the linear motor further includes a fixing portion, one end of the fixed screw rod is fixed to the fixing portion, and one end of the first outer tube is fixed to the fixing portion.

[0015] In one embodiment, the linear motor further comprises a plurality of screw rod assemblies, each of which is sequentially sleeved and assembled from the inside out, and the screw rod assembly comprises a screw rod, a nut disposed at one end of the screw rod, and an outer tube body connected to the outside of the nut.

[0016] In one embodiment, the linear motor further includes a guide support portion, which is rotatably connected to the other end of the transmission screw, and the outer surface of the guide support portion cooperates with the inner surface of the third outer tube to limit the relative rotation of the guide support portion and the third outer tube.

[0017] In a second aspect, a device using a linear motor comprises the linear motor described above.

[0018] Beneficial effects of the present invention: The device provided by the present invention, based on the above-mentioned linear motor, will greatly improve the lifting efficiency of the device, and the overall volume will be smaller and the space utilization will be higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a linear motor provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the exploded structure of a linear motor provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a partial exploded structure of a linear motor provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a top view of the structure of a linear motor provided in an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0025] Figure 6 A schematic diagram of the structure of the fixed screw rod, the linkage member of the drive mechanism and the power supply assembly provided in an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the structure of the transmission assembly and the screw nut provided in an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the front view of the structure of the transmission assembly and the lead screw nut provided in an embodiment of the present invention;

[0028] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure in the BB direction.

[0029] Among them, the reference numerals in the figure are:

[0030] 1000, linear motor; 100, first outer tube; 200, second outer tube; 300, third outer tube; 400, guide portion; 500, bearing; 600, mounting tube; 610, barrel portion; 620, first support portion; 630, second support portion; 700, control board; 10, fixed screw rod; 101, first external thread; 20, transmission assembly; 20a, transmission screw rod; 20b, transmission nut; 20b1, mounting section; 20b2, base section; 20c, limit groove structure; 111, support plate; 201 , second external thread; 30, screw nut; 40, driving mechanism; 50, fixing part; 60, guide support part; 51, groove; 202, first limiting part; 41, power part; 410, power output shaft; 42, linkage part; 420, first limiting fitting part; 411, motor; 412, gear box; 102, third limiting part; 6201, third limiting fitting part; 6301, fourth limiting fitting part; 800, power supply assembly; 110, first sealing part; 210, second sealing part; 330, connecting part. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figure 1 , Figure 2 and Figure 5 The embodiment of the present application provides a linear motor 1000, which can be applied to a device that needs to realize a lifting function, such as a lifter, a lifting platform, a lifting table, etc., but is not limited thereto; the linear motor 1000 includes a first outer tube 100, a second outer tube 200, a third outer tube 300, and a fixed screw 10, a transmission assembly 20, a screw nut 30, and a driving mechanism 40, wherein:

[0036] The fixed screw 10 has a hollow structure and is fixed, i.e., it does not perform either rotational motion or linear motion. A first external thread 101 is provided on the outer surface of the fixed screw 10. The first outer tube 100 is sleeved on the fixed screw 10 and fixed to one end of the fixed screw 10. The first outer tube 100 is tubular and hollow inside. The first outer tube 100 is located at the outermost layer of the linear motor 1000 and can be regarded as the outer shell of the linear motor 1000.

[0037] The transmission assembly 20 includes a transmission screw 20a, both of which are hollow structures, and a transmission nut 20b arranged at one end of the transmission screw 20a. The inner surface of the transmission nut 20b is provided with an internal thread. The transmission screw 20a and the transmission nut 20b are both sleeved on the fixed screw 10, and the internal thread of the transmission nut 20b is matched or screwed with the first external thread 101, so that when the transmission assembly 20 rotates relative to the fixed screw 10, it can make a linear motion relative to the fixed screw 10 through the screwing of the internal thread and the first external thread 101; the transmission assembly 20 0 is provided with a second external thread 201 on the outer surface of the transmission screw 20a; the second outer tube 200 is tubular and hollow inside, the second outer tube 200 is located inside the first outer tube 100 and is sleeved on the transmission screw 20a of the transmission assembly 20, and the second outer tube 200 is connected to the transmission assembly 20 so as to be able to move with the transmission assembly 20. When the transmission assembly 20 makes a linear motion relative to the fixed screw 10, the second outer tube 200 and the third outer tube 300 can make a linear motion simultaneously with the transmission assembly 20, so that they can be raised and lowered relative to the first outer tube 100.

[0038] The screw nut 30 is sleeved on the transmission screw 20a, and the screw nut 30 is threadedly matched with the second external thread 201 of the transmission screw 20a. Here, it means that the screw nut 30 is directly sleeved on the transmission screw 20a or is sleeved on the transmission screw 20a through an intermediate component; in one way, the screw nut 30 can be directly sleeved on the transmission screw 20a and threadedly matched with the second external thread 201. When the transmission screw 20a rotates, the screw nut 30 is directly driven to perform linear motion through the second external thread 201. In this case, the fixed screw 10 can be regarded as the first stage, the first outer tube 100 is the first stage lifting tube, the transmission screw 20a can be regarded as the second stage, the second outer tube 200 is the second stage lifting tube, the screw nut 30 can be regarded as the third stage, and the third outer tube 300 is the third stage lifting tube, thereby realizing three-stage lifting; in another way, the screw nut 30 can also be sleeved on the transmission screw 20a through an intermediate component, and the transmission screw When 20a rotates, the second external thread 201 drives the intermediate component to perform linear motion and indirectly drives the screw nut 30 to perform linear motion. For example, the intermediate component can be a hollow screw sleeved on the transmission screw 20a, and the screw nut 30 can be threadedly matched with the hollow screw. In this case, the fixed screw 10 can be regarded as the first level, the first outer tube 100 is the first level lifting tube, the transmission screw 20a can be regarded as the second level, the second outer tube 200 is the second level lifting tube, the hollow screw can be regarded as the third level, a hollow outer tube can be connected to the hollow screw as the third level lifting tube, the screw nut 30 can be regarded as the fourth level, and the third outer tube 300 is the fourth level lifting tube, thereby realizing four-level lifting. By analogy, multiple hollow screws and hollow outer tubes connected to the hollow screws can be set, and each hollow screw can be sleeved in sequence from the inside to the outside. The screw nut 30 is threadedly matched with the outermost hollow screw, thereby realizing multi-level lifting of more than four levels.

[0039] The driving mechanism 40 is placed in the fixed screw 10, and its power output end is connected to the transmission screw 20a of the transmission assembly 20, so as to drive the transmission assembly 20 to rotate relative to the fixed screw 10; wherein, the driving mechanism 40 refers to a mechanism or device that can provide a driving force and can drive the transmission assembly 20 to rotate relative to the fixed screw 10. For example, the driving mechanism 40 may include a motor and a transmission member connected to the output end of the motor, and the driving force provided by the motor causes the transmission member to drive the transmission assembly 20 to rotate relative to the fixed screw 10; of course, the driving mechanism 40 may also include only a motor, that is, the transmission assembly 20 is directly driven to rotate relative to the fixed screw 10 by the output end of the motor.

[0040] The linear motor 1000 provided in the embodiment of the present application is provided with a first outer tube 100, a second outer tube 200, a third outer tube 300, a fixed screw 10, a transmission assembly 20, a screw nut 30 and a driving mechanism 40. The fixed screw 10 is a hollow structure, the interior is hollow and is sleeved on the fixed screw 10. The driving mechanism 40 whose power output end is connected to the transmission assembly 20, wherein the transmission assembly 20 includes a transmission screw 20a and a transmission nut 20b, both of which are hollow structures, the inner surface of the transmission nut 20b is provided with an internal thread, and the outer surface of the fixed screw 10 is provided with a first external thread 101, and the screw nut 30 is sleeved on the outer side of the transmission screw 20a and is connected to the second external thread 201. In cooperation, the third outer tube 300, the second outer tube 200, and the first outer tube 100 are sequentially sleeved from the inside to the outside, and the first outer tube 100 is fixed to the fixed screw 10, the second outer tube 200 is connected to the transmission screw 20a of the transmission assembly 20, and the third outer tube 300 is connected to the screw nut 30. The transmission screw 20a of the transmission assembly 20 is driven by the driving mechanism 40 to rotate relative to the fixed screw 10. Under the cooperation of the internal thread and the first external thread 101, even if the transmission assembly 20 is rotated, At the same time as the rotational movement, it makes a linear motion along the axial direction of the fixed screw rod 10 (that is, the axial direction of the fixed screw rod 10) to realize the lifting and lowering of the transmission component 20. The transmission screw rod 20a of the transmission component 20 drives the second outer tube 200 and the third outer tube 300 to lift and lower relative to the first outer tube 100. At the same time, the rotation of the screw nut 30 relative to the transmission screw rod 20a can drive the third outer tube 300 to make a linear motion along the axial direction of the transmission screw rod 20a, so that the third outer tube 300 moves axially relative to the transmission screw rod 20a while following the axial movement of the transmission screw rod 20a relative to the fixed screw rod 10. That is, when the transmission screw rod 20a moves relative to the fixed screw rod 10, the internal thread of the screw nut 30 on the third outer tube 300 cooperates with the second external thread 201 to quickly lift and lower, and the third outer tube 300 is lifted and lowered relative to the second outer tube 200, thereby realizing the simultaneous lifting of the second outer tube 200 and the third outer tube 300, which can effectively improve the lifting efficiency of the linear motor 1000. The driving mechanism 40 is arranged inside the fixed screw 10, which can improve the stability and convenience of the placement of the driving mechanism 40. In this way, the overall structure is compact, the linear motor is more integrated, the overall volume is smaller, and the distance between the ends of the fixed screw 10 and the transmission assembly 20 close to the same end of the driving mechanism 40 is relatively short, which is beneficial to shortening the length of the linear motor 1000 after it is fully retracted; and, it does not occupy external space, which can improve space utilization, and the matching distance between the power output end of the driving mechanism 40 and the transmission assembly 20 is shorter, which is more conducive to driving the transmission assembly 20 to rotate relative to the fixed screw 10, which can shorten the connection matching length between the driving mechanism 40 and the transmission assembly 20 and improve transmission stability.

[0041] In one embodiment, please refer to the figure, the rotation direction of the second external thread 201 is opposite to that of the first external thread 101, so that the moving direction of the lead screw nut 30 threadedly connected to the second external thread 201 during linear motion is consistent with the moving direction of the transmission screw 20a during linear motion, thereby achieving the lead screw nut 30 threadedly connected to the second external thread 201 and the transmission screw 20a to rise and fall or extend in the same direction at the same time; wherein, the rotation direction refers to the screw-in direction of the thread, the thread screwed in when rotating clockwise is called a right-hand thread, and the thread screwed in when rotating counterclockwise is called a left-hand thread.

[0042] In one embodiment, see Figure 2 and Figure 3 The linear motor 1000 also includes a fixing part 50, and the same end of the fixed screw 10 and the first outer tube 100 are fixed to the fixing part 50, and the first outer tube 100 is fixed to the fixed screw 10 through the fixing part 50; wherein, the fixing part 50 can be a base, and the fixed screw 10 and the first outer tube 100 can be fixed to the fixing part 50 vertically, or the fixing part 50 can be a base, and the fixed screw 10 and the first outer tube 100 can be fixed to the fixing part 50 horizontally, and of course, the fixing part 50 can also be other structures. In this way, the fixing part 50 can be fixedly connected to the fixed screw 10 and the first outer tube 100, prevent the fixed screw 10 and the first outer tube 100 from moving, and enhance stability.

[0043] Optionally, in one embodiment, see Figure 3 The fixing portion 50 has a groove 51, and one end of the fixing screw 10 is inserted into the groove 51. In this way, the groove 51 cooperates with the fixing screw 10 to prevent the fixing screw 10 from swinging or moving relative to the fixing portion 50, thereby improving the stability of the fixing screw 10. Alternatively, the fixing portion 50 has a protrusion, which protrudes into the hollow part of the fixing screw 10, which can also play a positioning role.

[0044] It should be noted that in some other embodiments, the groove 51 may not be provided. For example, the fixing screw rod 10 and the fixing portion 50 are directly fixedly connected by screws, bolts, rivets, welding, etc.

[0045] Optionally, in one embodiment, see Figure 5 and Figure 6 The fixing screw rod 10 is detachably fixed to the fixing part 50. For example, the fixing screw rod 10 can be fixed to the fixing part 50 by screws or bolts. Such arrangement facilitates the disassembly and installation between the fixing screw rod 10 and the fixing part 50.

[0046] Optionally, in one embodiment, see Figure 3 , Figure 5 and Figure 6The linear motor 1000 also includes a support plate 111, which is supported between the fixed screw 10 and the first outer tube 100 to improve stability. The support plate 111 can be located on the fixed screw 10 close to the fixed portion 50, and the support plate 111 can also play a role of mechanical limiting, that is, limiting the downward limit position of the second outer tube 200 and the third outer tube 300 along the axial direction.

[0047] In one embodiment, see Figure 2 , Figure 5 and Fig. 9The transmission nut 20b has a base section 20b2. The linear motor 1000 also includes a bearing 500. The bearing 500 is located between the second outer tube 200 and the transmission component 20 and is connected to the base section 20b2. The outer edge of the bearing 500 is provided with a guide portion 400. The guide portion 400 can be in the shape of a hollow sleeve, a nut, or a bearing seat. The guide portion 400 is sleeved on one end of the transmission component 20 close to the base section 20b2. The guide portion 400 is clearance-matched with the outer surface of the transmission screw 20a of the transmission component 20 so that the two can rotate relative to each other. One end of the second outer tube 200 is connected to the guide portion 400. The bearing 500 is located between the guide portion 400 and the base section 20b2 and The guide portion 400 and the base segment 20b2 are connected so that the transmission nut 20b of the transmission assembly 20 and the guide portion 400 can rotate relative to each other through the bearing 500; wherein the outer surface of the guide portion 400 matches the inner surface of the first outer tube 100, or the outer surface of the second outer tube 200 matches the inner surface of the first outer tube 100, or the outer surface of the guide portion 400 and the outer surface of the second outer tube 200 both match the inner surface of the first outer tube 100 to limit the relative rotation of the guide portion 400 and the first outer tube 100, so that when the base segment 20b2 rotates relative to the fixed screw 10 and makes a linear motion, the guide portion 400 can be driven to make a linear motion through the bearing 500, and the guide portion 400 can be driven to make a linear motion through the bearing 500. The guide portion 400 drives the second outer tube 200 to make a linear motion, so that the second outer tube 200 can only make a linear motion to achieve lifting; wherein, the outer surface of the guide portion 400 matches the inner surface of the first outer tube 100, and the outer surface shape of the guide portion 400 can be adapted to the inner surface shape of the first outer tube 100, for example, both are non-circular (for example, polygons such as quadrilaterals and pentagons), or the outer surface of the guide portion 400 is provided with a convex strip, and the inner surface of the first outer tube 100 is provided with a slide groove that slidably matches the convex strip on the guide portion 400 along its length direction, or the outer surface of the guide portion 400 is provided with a slide groove, and the inner surface of the first outer tube 100 is provided with a slide groove that slidably matches the guide strip along its length direction. The outer surface of the second outer tube 200 is matched with the inner surface of the first outer tube 100. The shape of the outer surface of the second outer tube 200 can be matched with the shape of the inner surface of the first outer tube 100. For example, both are non-circular (for example, polygons such as quadrilaterals and pentagons). The outer surface of the second outer tube 200 can be provided with convex strips, and the inner surface of the first outer tube 100 can be provided with convex grooves that slide with the convex strips on the second outer tube 200 along its length. The outer surface of the second outer tube 200 can also be provided with convex grooves, and the inner surface of the first outer tube 100 can be provided with convex strips that slide with the grooves on the second outer tube 200 along its length.

[0048] It should be noted that the cooperation mode between the second outer tube 200 and the transmission assembly 20 is not limited to this. In some other embodiments, one end of the second outer tube 200 can be directly connected to the transmission assembly 20 through a bearing, and one end of the second outer tube 200 can also be directly rotated with the transmission assembly 20 without being rotated through an intermediate piece.

[0049] In another embodiment, the bearing 500 and the guide portion 400 are integrally formed, and the guide portion 400 is located at the outer edge of the bearing 500. The integrated arrangement of the two is conducive to placement and alignment during installation, and is suitable for the case where the specifications of the second outer tube 200 are determined, thereby meeting the assembly requirements of the second outer tube 200 and the guide portion 400.

[0050] In one embodiment, please refer to the figure, the transmission nut 20b also has a mounting section 20b1 connected to the base section 20a2, and the mounting section 20a1 extends into the transmission screw 20a. It can be understood that in order to improve the quick connection of the transmission nut 20b and the transmission screw 20a, and the connection stability. During installation, the mounting section 20a1 can extend into the transmission screw 20a to play the role of a positioning column. At the same time, in order to further provide stability between the transmission nut 20b and the transmission screw 20a, a screw is screwed into the end face of the base section 20b2 to connect to the end face of the transmission screw 20a.

[0051] In one embodiment, please refer to Figure 6 , the inner surface of the transmission screw 20a is provided with a first limiting portion 202 along the axial direction of the transmission screw 20a, and the outer surface of the mounting section 20a1 is provided with a limiting groove structure 20c adapted to the first limiting portion 202. It can be understood that the connection stability between the transmission screw 20a and the transmission nut 20b is further improved by the adaptation of the first limiting portion 202 and the limiting groove structure 20c. That is, when the transmission screw 20a and the transmission nut 20b are connected by screws, the torsional force between the two causes the screw to be subjected to shear force, which is easy to break. However, the first limiting portion can be a convex rib arranged along the axial direction of the transmission screw 20a, and the limiting groove structure 20c is also arranged along the axial direction of the mounting section 20a1, so that the nut section and the screw section form a binding force in the circumferential direction, and the connection stability is greatly improved.

[0052] Optionally, in one embodiment, see Figure 3 as well as Figures 5 to 7The inner surface of the transmission assembly 20 is provided with a plurality of first limiting parts 202 along the axial direction of the transmission assembly 20. The driving mechanism 40 includes a power unit 41 and a linkage member 42. The power unit 41 is fixed to the fixed screw rod 10. Specifically, the power unit 41 is fixed to the inside of the fixed screw rod 10. For example, the power unit 41 can be fixed to the inside of the fixed screw rod 10 by means of clamping, welding, threaded connection, screws or bolts. The power unit 41 has a power output shaft 410, which extends to the outside of the fixed screw rod 10. The linkage member 42 is fixed on the power output shaft 410 and is located inside the transmission assembly 20. The linkage member 42 has a plurality of first limiting matching parts 420. The first limiting matching part 420 is slidably matched with the first limiting part 202, which can limit the relative rotation of the linkage member 42 and the transmission assembly 20, and can only make relative linear motion; wherein the linkage member 42 refers to a member capable of transmitting the rotation power of the power output shaft 410 The intermediate power transmission member transmitted to the transmission component 20, for example, the linkage member 42 can be a spline, a linkage member in the shape of a cylinder, a fan, a strip, or a linkage member in other regular or irregular shapes; specifically, the first limiting portion 202 can be a convex strip protruding on the inner surface of the transmission component 20 along the axial direction of the transmission component 20, and the first limiting matching portion 420 can be a slide groove provided on the outer peripheral surface of the linkage member 42. Of course, the first limiting portion 202 can also be a slide groove recessed on the inner surface of the transmission component 20 along the axial direction of the transmission component 20, and the first limiting matching portion 420 is a convex strip or protrusion convexly provided on the outer peripheral surface of the linkage member 42. Through the sliding cooperation between the slide groove and the convex strip or protrusion, the relative rotation of the linkage member 42 and the transmission component 20 can be limited, so that the linkage member 42 can drive the transmission component 20 to rotate when it rotates, and at the same time, the transmission component 20 can move linearly relative to the fixed screw rod 10 when it makes a linear motion with the linkage member 42. During operation, the power output shaft 410 of the power unit 41 drives the linkage member 42 to rotate, and the linkage member 42 drives the transmission assembly 20 to rotate through the cooperation between the first limiting portion 202 and the first limiting matching portion 420. The transmission assembly 20 makes a linear motion relative to the fixed screw 10 under the cooperation between the internal thread and the first external thread 101, and the transmission assembly 20 and the linkage member 42 make a relative linear motion. At the same time, the linkage member 42 can play a role in supporting and stabilizing the transmission assembly 20. Such a configuration is conducive to the driving mechanism 40 to stably drive the transmission assembly 20 to make rotational motion and linear motion relative to the fixed screw 10 at the same time, so that the matching structure between the fixed screw 10, the driving mechanism 40 and the transmission assembly 20 is compact and highly stable.

[0053] Optionally, in one embodiment, see Figure 3 and Figure 5The power unit 41 includes a motor 411 and a gear box 412. The motor 411 is installed inside the fixed screw rod 10. The input end of the gear box 412 is connected to the output shaft of the motor 411. The gear box 412 has a power output shaft 410. Specifically, the motor 411 and the gear box 412 are both fixed inside the fixed screw rod 10. It can be understood that the gear box 412 can adopt any type of existing gear boxes. When working, through the action of the power unit 41, the power of the motor 411 is transmitted to the gear box 412 by its output shaft, and then transmitted to the power output shaft 410 by the gear set inside the gear box 412, and then transmitted to the linkage 42.

[0054] It should be noted that the structure of the power unit 41 is not limited thereto. In some other embodiments, the power unit 41 may be a reduction motor having a power output shaft 410 .

[0055] In one embodiment, the linear motor further includes a control board 700, which is disposed in the fixed screw 10, and is electrically connected to the power unit 41. It can be understood that the control board 700 has electronic components, and the control board 700 is electrically connected to the power unit 41 for controlling the power unit 41. In this way, the fixed screw 10 with a hollow structure is used to accommodate the control board 700, so that a high degree of integration is achieved, and the structural density of the linear motor 1000 is improved.

[0056] In another embodiment, see Figure 3 and Figure 5 , which is different from the above-mentioned embodiment, the linear motor 1000 further includes a mounting tube 600 and a control board 700, the mounting tube 600 is arranged inside the fixed screw 10, the control board 700 is arranged inside the mounting tube 600, the control board 700 has electronic components, and the control board 700 is electrically connected to the power unit 41 for controlling the power unit 41. In this arrangement, by placing the control board 700 in the mounting tube 600, and the mounting tube 600 is installed inside the fixed screw 10, the power unit 41 can be controlled inside the fixed screw 10, so that high integration is achieved, the structural density of the linear motor 1000 is improved, and there is no need to set up additional control components outside the linear motor 1000. Furthermore, a through hole is opened at the end of the fixed screw 10 close to the end connected to the first outer tube 100, and a through hole is also opened on the first outer tube 100, so that wires such as power lines can be passed through to connect the inner control board 700 and the external circuit or power supply.

[0057] Optionally, in one embodiment, see Figure 3 and Figure 5The mounting tube 600 includes a barrel portion 610, a first support portion 620, and a second support portion 630, wherein the first support portion 620 is connected to one end of the barrel portion 610, and the second support portion 630 is connected to the other end of the barrel portion 610; wherein the control board 700 is located inside the barrel portion 610, and the two ends of the control board 700 are respectively connected to the first support portion 620 and the second support portion 630, specifically, the two ends of the control board 700 can be respectively abutted against or clamped to the first support portion 620 and the second support portion 630. Such a configuration facilitates the installation of the control board 700 in the mounting tube 600, and can prevent the relative rotation between the control board 700 and the mounting tube 600, thereby improving the stability of the placement of the control board 700.

[0058] Optionally, in one embodiment, see Figure 3 and Figure 5 A plurality of heat dissipation holes are provided on the upper portion of the cylinder 610 to dissipate the heat generated when the control panel is working and improve safety.

[0059] Optionally, in one embodiment, see Figure 3 and Figure 5 The inner surface of the fixed screw rod 10 is provided with a third limiting portion 102 along the axial direction of the fixed screw rod 10, the outer surface of the first support portion 620 is provided with a third limiting matching portion 6201 matched with the third limiting portion 102, and the outer surface of the second support portion 630 is provided with a fourth limiting matching portion 6301 matched with the third limiting portion 102. Of course, only the outer surface of the first support portion 620 may be provided with a third limiting matching portion 6201 matched with the third limiting portion 102, or only the outer surface of the second support portion 630 may be provided with a fourth limiting matching portion 6301 matched with the third limiting portion 102; wherein the third limiting portion 102 may be a convex strip, and the third limiting matching portion 6201 and the fourth limiting matching portion 6301 are both slide grooves; the third limiting portion 102 may be a slide groove, and the third limiting matching portion 6201 and the fourth limiting matching portion 6301 are both convex strips. With such arrangement, the third limiting portion 102 cooperates with the third limiting matching portion 6201 and the fourth limiting matching portion 6301 to limit relative rotation between the mounting tube 600 and the fixed screw rod 10, so as to improve the stability of the mounting tube 600 and the control board 700 located inside the mounting tube 600.

[0060] In one embodiment, see Figure 3 , Figure 5 and Figure 6The linear motor 1000 also includes a power supply assembly 800, which has components such as an adapter. The power supply assembly 800 is arranged inside the first outer tube 100. Specifically, the power supply assembly 800 can be arranged between one end of the fixed screw rod 10 and one end of the first outer tube 100, and can be arranged close to the fixed portion 50. Of course, the power supply assembly 800 can also be arranged at other positions in the first outer tube 100; the power supply assembly 800 is electrically connected to the drive mechanism 40, and the power supply assembly 800 can also have a power cord, which can extend to the outside of the first outer tube 100 so as to be electrically connected to the power supply. The power supply assembly 800 can be used to convert the input power supply voltage into various levels of working voltage required by the drive mechanism 40 or the control board 700; the power supply assembly 800 has components such as a circuit board and an adapter. It can be understood that it can also have various other components required for realizing power supply voltage conversion. Ordinary technicians in this field can set it according to actual application requirements. With such a configuration, the power supply assembly 800 is directly built into the linear motor 1000 , so that the linear motor 1000 can work directly after being connected to an external power supply, without the need to set up other peripheral configurations outside the linear motor 1000 .

[0061] Optionally, in one embodiment, see Figure 2 and Figure 5 The linear motor 1000 also includes a guide support portion 60, which is rotatably connected to one end of the transmission screw 20a away from the transmission nut 20b. The guide support portion 60 and the transmission component 20 can be clearance-matched. For example, a smooth section is provided on the outer surface of one end of the transmission component 20, and the guide support portion 60 can be rotatably sleeved on the smooth section. Of course, the guide support portion 60 can also be rotatably connected to the transmission component 20 through a bearing; the outer surface of the guide support portion 60 cooperates with the inner surface of the third outer tube 300 to limit the relative rotation of the guide support portion 60 and the third outer tube 300, wherein the outer surface of the guide support portion 60 cooperates with the inner surface of the third outer tube 300, and the outer surface of the guide support portion 60 can adopt the above-mentioned method of the outer surface of the guide portion 400 cooperating with the inner surface of the first outer tube 100. With such arrangement, the guide support portion 60 can be supported between the transmission assembly 20 and the third outer tube 300. The guide support portion 60 can only make linear motion with the transmission assembly 20 but not rotational motion with the transmission assembly 20, thereby improving the stability of the relative movement between the transmission assembly 20 and the third outer tube 300.

[0062] Optionally, in one embodiment, see Figure 1 , Figure 2 and Figure 5A first seal 110 is provided at the end of the first outer tube 100 away from the end where the first outer tube 10 is fixed to the fixed screw rod 10. The first seal 110 is sealed between the first outer tube 100 and the second outer tube 200, which can improve the sealing performance and prevent external impurities from entering. A second seal 210 is provided at the end of the second outer tube 200 away from the end where the first outer tube 100 is fixed to the fixed screw rod 10. The second seal 210 is sealed between the second outer tube 200 and the third outer tube 300, which can improve the sealing performance, prevent external impurities from entering, and play a supporting role.

[0063] Optionally, in one embodiment, the end of the third outer tube 300 is sealed with a connecting piece 330. Specifically, the connecting piece 330 is arranged on the end of the third outer tube 300 away from the end where the first outer tube 100 and the fixed screw rod 10 are fixed. The connecting piece 330 can seal the end of the third outer tube 300 to prevent external impurities such as dust from entering the interior of the third outer tube 300 and affecting the transmission coordination between the transmission screw rod 20a and the fixed screw rod 10, and the transmission coordination between the transmission screw rod 20a and the third outer tube 300 or external objects. It can also be used to connect with external objects that need to be lifted and lowered, thereby playing a connecting role.

[0064] In another embodiment, the linear motor 1000 also includes a plurality of screw assemblies, which are sequentially mounted from the inside to the outside, with the innermost screw assembly mounted on the transmission screw 20a, and the third outer tube can be connected to the outermost screw assembly. The transmission screw 20a can drive each screw assembly to rotate and move along the axial direction of the transmission screw 20a, thereby realizing multi-stage lifting.

[0065] Optionally, in one embodiment, the screw assembly includes a hollow screw and a sleeve connected to the hollow screw, the interior of the hollow screw is hollow, the inner surface of the hollow screw is provided with an internal thread, the outer surface of the hollow screw is provided with an external thread, each hollow screw is sleeved from the inside to the outside in sequence, and the internal thread of the outer layer of the hollow screw in two adjacent hollow screws matches or screws with the external thread of the inner layer of the hollow screw; in two adjacent screw assemblies, the sleeve of the outer layer of the screw assembly is sleeved in the sleeve of the inner layer of the screw assembly; the innermost hollow screw is sleeved in the transmission screw 20a, and the internal thread of the innermost hollow screw matches or screws with the second external thread 201 of the transmission screw 20a. By rotating the transmission screw 20a and driving the hollow screws of each screw assembly to move linearly and / or rotate through the second external thread 201, the sleeve of each screw assembly can be lifted and lowered, thereby realizing multi-stage lifting. For ordinary technicians in this field, the parameters such as the lead angle of the second external thread 201 and the external thread of each hollow screw can be set according to the actual application needs. Further, the screw nut 30 can be threadedly matched with the external thread of the hollow screw of the outermost screw assembly, and the third outer tube 300 can be connected to the screw nut 30. Of course, the sleeve of the outermost screw assembly can also be removed, and the third outer tube 300 can be connected to the hollow screw of the outermost screw assembly.

[0066] Optionally, in one embodiment, the above-mentioned hollow screw can be replaced by a screw structure and a nut fixedly connected to the screw structure. The screw structure and the nut can be coaxially arranged, the interior of the screw structure is hollow, and the outer surface of the screw structure is provided with an external thread. The screw structure of each screw assembly is sleeved from the inside to the outside in sequence, and the nut of the screw assembly of the outer layer of the two adjacent screw assemblies is threadedly matched or screwed with the external thread of the screw assembly of the inner layer; the screw structure of the innermost screw assembly is sleeved on the transmission screw 20a, and the nut of the innermost screw assembly is matched or screwed with the second external thread 201 of the transmission screw 20a. The nuts and screw structures of each screw assembly are driven to move linearly and / or rotate through the second external thread 201 by rotating the transmission screw 20a, thereby realizing multi-stage lifting or telescoping. For ordinary technicians in this field, parameters such as the lift angle of the second external thread 201 and the internal thread of the nut of each screw assembly can be set according to actual application needs.

[0067] Optionally, in one embodiment, the screw assembly includes a screw, a nut and an outer tube body, the interior of the screw is hollow, the inner surface of the screw is provided with a second limiting portion along the axial direction of the screw, the outer surface of the screw is provided with an external thread, the nut is rotatably connected to one end of the screw, specifically, the nut can be connected to one end of the screw through a bearing, so that the screw and the nut can rotate relative to each other, of course, the nut can also be directly rotatably matched with the screw without a bearing; specifically, the second limiting portion can be a convex strip convexly provided on the inner surface of the screw along the axial direction of the screw, and the second limiting matching portion can be a second limiting portion that is a sliding groove concavely provided on the inner surface of the screw along the axial direction of the screw; the outer tube body is located inside the second outer tube 200 and is sleeved on the screw, and the outer tube body is connected to the nut so as to be able to move with the nut; Among them, the screw of the innermost screw assembly is sleeved on the transmission screw 20a, the nut thread of the innermost screw assembly is matched with the second outer thread 201, the innermost screw assembly is fixed to the transmission screw 20a, and the outer surface of the nut of the innermost screw assembly is matched with the inner surface of the second outer tube 200 to limit the relative rotation of the nut and the second outer tube 200. Of course, only the outer surface of the outer tube body can be matched with the inner surface of the second outer tube 200, or the outer surface of the nut and the outer surface of the outer tube body can be matched with the inner surface of the second outer tube 200. Among them, the outer surface of the nut of the innermost screw assembly is matched with the inner surface of the second outer tube 200, and the outer surface of the guide part 400 mentioned above can be matched with the first outer tube 100. The outer surface of the outer tube body cooperates with the inner surface of the second outer tube 200, and the outer surface of the second outer tube 200 cooperates with the inner surface of the first outer tube 100. The above-mentioned outer surface of the second outer tube 200 can be used to cooperate with the inner surface of the first outer tube 100; the screw nut 30 can be threadedly matched with the outer thread of the screw of the outermost screw assembly. When the number of screw assemblies is one, the outermost screw assembly and the innermost screw assembly are the same screw assembly; the outer surface of the screw nut 30 can cooperate with the inner surface of the outer tube body of the outermost screw assembly to limit the relative rotation of the screw nut 30 and the outer tube body. Of course, only the outer surface of the third outer tube 300 can cooperate with the inner surface of the outer tube body of the outermost screw assembly, or the outer surface of the screw nut 30 The outer surfaces of the third outer tube 300 and the third outer tube 300 are matched with the inner surface of the outer tube body of the outermost screw rod assembly, wherein the outer surface of the screw nut 30 is matched with the inner surface of the outer tube body of the outermost screw rod assembly in a manner that the outer surface of the guide part 400 is matched with the inner surface of the first outer tube 100, and the outer surface of the third outer tube 300 is matched with the inner surface of the outer tube body of the outermost screw rod assembly in a manner that the outer surface of the second outer tube 200 is matched with the inner surface of the first outer tube 100; the transmission screw 20a can drive each screw rod assembly to rotate and move along the axial direction of the transmission screw 20a, so that the outer tube bodies of each screw rod assembly are lifted and lowered at the same time, thereby realizing multi-stage lifting of four or more stages.

[0068] Specifically, when the number of screw rod assemblies is one, the driving mechanism 40 drives the transmission screw rod 20a to perform rotational motion and linear motion, and the transmission screw rod 20a drives the second outer tube 200 to rise and fall relative to the first outer tube 100. When the transmission screw rod 20a performs rotational motion, the screw rod is driven to rotate by the follower, and at the same time, the nut of the screw rod assembly is driven to perform linear motion relative to the transmission screw rod 20a through the second external thread 201, so that the screw rod performs linear motion and rotational motion at the same time, and the nut drives the outer tube body to rise and fall relative to the second outer tube 200. When the screw rod performs rotational motion, the screw rod nut can be driven through its external thread. 30 makes linear motion, and the screw nut 30 drives the third outer tube 300 to rise and fall relative to the outer tube body. In this case, the fixed screw 10 can be regarded as the first stage, the first outer tube 100 is used as the first stage lifting tube, the transmission screw 20a can be regarded as the second stage, the second outer tube 200 is used as the second stage lifting tube, the screw can be regarded as the third stage, the outer tube body is used as the third stage lifting tube, the screw nut 30 can be regarded as the fourth stage, and the third outer tube 300 is used as the fourth stage lifting tube, thereby realizing four-stage lifting, and the second outer tube 200, the outer tube body and the third outer tube 300 are lifted and lowered at the same time, which can effectively improve the lifting efficiency.

[0069] Specifically, when the number of screw assemblies is two or more, the innermost screw assembly is sleeved on the transmission screw 20a, the screw of the second inner screw assembly is sleeved on the screw of the innermost screw assembly, the nut thread of the second inner screw assembly is matched with the external thread of the screw of the innermost screw assembly, the follower of the second inner screw assembly is fixed to the screw of the innermost screw assembly, the outer surface of the nut of the second inner screw assembly and / or the outer surface of the outer tube body of the second inner screw assembly are matched with the inner surface of the outer tube body of the innermost screw assembly to limit the relative rotation between the nut of the second inner screw assembly and the outer tube body of the innermost screw assembly, and so on. The screw assemblies are sleeved and assembled in sequence from the inside to the outside, and the transmission screw 20a can be used to drive each screw assembly to rotate and move along the axial direction of the transmission screw 20a, and the outer tube body of each screw assembly can be lifted and lowered at the same time, which can achieve multi-stage lifting of five or more levels.

[0070] An embodiment of the present application also provides a device using a linear motor, and the device using a linear motor includes the linear motor 1000 of any of the above embodiments, wherein the linear motor is used to provide lifting and lowering. The device using the linear motor is a device that needs to realize a lifting and lowering function, for example, it can be a lifter, a lifting platform, a lifting table, etc., but is not limited to this.

[0071] Since the device using a linear motor provided in the embodiment of the present application adopts the linear motor 1000 of the above embodiment, it also has the technical effects brought by the technical solution of the above linear motor 1000, which will not be repeated here.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear motor, characterized in that: The linear motor comprises: A fixed screw rod, wherein the fixed screw rod is hollow inside and has a first external thread on its outer surface; A transmission assembly, the transmission assembly comprising a transmission screw rod having a hollow structure and a transmission nut arranged at one end of the transmission screw rod, the transmission screw rod and the transmission nut are sleeved on the fixed screw rod, and the internal thread of the transmission nut matches the first external thread; the outer surface of the transmission screw rod is provided with a second external thread; A screw nut, which is sleeved on the outer side of the transmission screw and is adapted to the second external thread; A driving mechanism, the driving mechanism is placed in the fixed screw, and a power output end of the driving mechanism is connected to the transmission assembly to drive the transmission assembly to rotate relative to the fixed screw; A first outer tube, wherein the first outer tube is sleeved on the fixed screw rod; a second outer tube, the second outer tube being located inside the first outer tube and sleeved on the transmission screw, the second outer tube being connected to the transmission screw so as to be able to move with the transmission screw; and A third outer tube is located inside the second outer tube and is connected to the outer side of the screw nut.

2. The linear motor according to claim 1, characterized in that: The hand direction of the second external thread is opposite to the hand direction of the first external thread.

3. The linear motor according to claim 1, characterized in that: The inner surface of the transmission screw is provided with a first limiting portion along the axial direction of the transmission screw, and the driving mechanism comprises: a power unit, the power unit being fixed in the fixed screw rod, the power unit having a power output shaft extending out of the fixed screw rod; and A linkage member is fixed to the power output shaft and is located inside the transmission screw. The linkage member has a first position-limiting fitting portion, and the first position-limiting fitting portion is slidably fitted with the first position-limiting portion.

4. The linear motor according to claim 3, characterized in that: The linear motor also includes: A control board is placed in the fixed screw rod and is electrically connected to the power unit.

5. The linear motor according to claim 3, characterized in that: The linear motor also includes: A mounting tube, the mounting tube being disposed inside the fixed screw rod; and A control panel, the control panel is arranged inside the installation tube, the control panel is electrically connected to the power unit, and is used to control the power unit; Wherein, the installation tube comprises: Cylinder body; A first supporting portion connected to one end of the cylindrical portion; and a second supporting portion, the second supporting portion being connected to the other end of the cylindrical portion; The control board is located inside the cylindrical portion, and two ends of the control board are respectively connected to the first supporting portion and the second supporting portion.

6. The linear motor according to any one of claims 1 to 5, characterized in that: The transmission nut of the transmission assembly has a base section, and the linear motor further comprises: A bearing, the bearing is located between the second outer tube and the transmission assembly and connected to the base section, and a guide portion is provided on the outer edge of the bearing; Wherein, the outer surface of the guide portion and / or the second outer tube cooperates with the inner surface of the first outer tube to limit the relative rotation of the guide portion and the first outer tube.

7. The linear motor according to any one of claims 1 to 5, characterized in that: The linear motor further comprises a power supply assembly, which is disposed inside the first outer tube and is electrically connected to the driving mechanism; And / or, the end of the third outer tube is sealed with a connecting piece; And / or, the linear motor further includes a fixing portion, one end of the fixing screw is fixed to the fixing portion, and one end of the first outer tube is fixed to the fixing portion.

8. The linear motor according to any one of claims 1 to 5, characterized in that: The linear motor also includes a plurality of screw rod assemblies, each of which is sequentially sleeved and assembled from the inside to the outside. The screw rod assembly includes a screw rod, a nut arranged at one end of the screw rod, and an outer tube body connected to the outside of the nut.

9. The linear motor according to any one of claims 1 to 5, characterized in that: The linear motor also includes a guide support portion, which is rotatably connected to the other end of the transmission screw, and the outer surface of the guide support portion cooperates with the inner surface of the third outer tube to limit the relative rotation of the guide support portion and the third outer tube.

10. A device using a linear motor, characterized in that: Comprising a linear motor as claimed in any one of claims 1 to 9.

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