Modular linear motor

Abstract

The invention relates to a modular linear motor, and aims to solve the problems of limited length, poor part adaptability, inconvenience in installation and maintenance and the like of an existing linear motor. The linear motor comprises a stator base, a permanent magnet module, a connecting table, a rotor iron core module and the like. The stator base and the protective cover plate can be spliced through the positioning tensioning mechanism and the bridging fastener respectively, modular combination is achieved, splicing precision and structural strength are guaranteed, a magnetic field is made to be continuous, and electromagnetic force is made to be uniform. And a gap adjusting mechanism is arranged on one side of the connecting table, so that the distance between the reading head and the grating ruler can be flexibly adjusted within 0-5mm to adapt to parts of different brands. In addition, tool-free rapid splicing and modular design simplify the installation process, facilitate rapid replacement of fault parts, reduce the use and maintenance cost, and improve the operation stability and usability of the equipment.

Description

Technical Field

[0001] The present invention relates to the field of linear motors, and in particular to a modular linear motor. Background Art

[0002] As a transmission device that can directly convert electrical energy into mechanical energy of linear motion, linear motors play a key role in many fields such as industrial automation, CNC machine tools, semiconductor manufacturing, and logistics transportation. Unlike traditional rotary motors that use complex intermediate conversion mechanisms such as gears, chains, and screws to convert rotary motion into linear motion, linear motors have significant advantages such as simple structure, fast response speed, high positioning accuracy, smooth movement, and low noise, which can greatly improve the operating efficiency and performance of equipment.

[0003] In the existing linear motor technology system, its basic structure consists of a stator and a mover. The stator contains an iron core and a winding, which generates a magnetic field when energized; the mover, depending on the type of linear motor, includes a magnetic conductor, a secondary conductor, or a permanent magnet, which interacts with the stator magnetic field to generate electromagnetic force and drive the mover to move in a straight line. In order to ensure the accuracy and stability of linear motion, auxiliary components such as support and guide devices (such as linear guides), position detection devices (such as grating scales, encoders), and cooling devices are also provided.

[0004] However, as industrial production needs become increasingly diversified and personalized, existing linear motor technology has gradually exposed some defects that make it difficult to meet practical applications.

[0005] Length limitation problem: Traditional linear motors usually adopt fixed length specifications during the design and manufacturing stages. When users need linear motion with a longer stroke, it is difficult to find standard length linear motor products that meet the needs. If multiple linear motors of standard lengths are spliced ​​to achieve long-stroke motion, the existing splicing method has the problem of difficult to ensure accuracy. The continuity of the magnetic field between the stator and the mover at the splicing point is easily affected, resulting in uneven distribution of electromagnetic force, causing the mover to move unsteadily and shake when passing through the splicing point, seriously affecting the operating accuracy and stability of the equipment.

[0006] Component adaptation issues: In actual industrial application scenarios, in order to meet diverse production needs, optimize costs or take advantage of the advantages of different brands of components, users often try to freely combine linear motors, scales and read heads of different brands. However, there are significant differences in design concepts, manufacturing processes and technical standards between linear motors, scales and read heads of different brands.

[0007] For example, the detection distance specifications between scales and readheads of different brands vary. The optimal detection distance between some readheads and scales may be only 1-2mm, while others may require 3-5mm. When designing existing linear motors, the distance between the readhead and scale is usually fixed, which is difficult to flexibly adjust according to the different brands or models of scales and readheads actually used.

[0008] In addition, many readheads must be used with specific plastic spacers during installation. These plastic spacers are used to accurately adjust the distance between the readhead and the scale. However, plastic spacers are small and easy to lose. Once lost, it becomes very difficult to adjust the detection distance when installing the scale again, and may even cause the failure of normal installation and use. This requires users to make complex modifications or adjustments to the structure of the entire linear motor when replacing or combining position detection devices of different brands, which not only increases the cost of use and the difficulty of maintenance, but may also affect the performance and stability of the linear motor due to improper modification.

[0009] Installation and maintenance issues: Existing linear motors often rely on a large number of tools and complex operating steps when they are spliced ​​and installed, which not only reduces the installation efficiency, but also places high demands on the technical level of the installers. During the maintenance process, due to its complex structure and strong correlation between components, once a component fails, it may be necessary to disassemble a large number of related components for repair or replacement, which undoubtedly increases the maintenance time and cost and reduces the availability of the equipment.

[0010] In summary, the existing linear motor technology has obvious deficiencies in terms of length scalability, component adaptability, and ease of installation and maintenance. Summary of the invention

[0011] Based on this, it is necessary to provide a modular linear motor to address the existing technical problems.

[0012] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: A modular linear motor comprises a stator base, a plurality of permanent magnet modules fixed on the stator base in a linear arrangement state, end plates fixedly arranged at both ends of the stator base, a connecting platform slidably arranged on the stator base, two linear slide rails fixed on the stator base for slidingly connecting the two sides of the connecting platform, a mover core module fixed at the bottom of the connecting platform, a protective cover plate fixedly arranged above the stator base and covering the middle of the connecting platform, a scale fixedly arranged on one side of the stator base, and a reading head fixedly connected to one side of the connecting platform and matched with the scale, the number of the stator base and the protective cover plate is at least one and the number of the two is equal, every two adjacent stator bases are spliced ​​and connected by a positioning and tightening mechanism, every two adjacent protective cover plates are spliced ​​and connected by a bridging fastener, one side of the connecting platform is provided with a gap adjustment mechanism for adjusting the distance between the reading head and the scale, each of the permanent magnet modules is fixedly connected to the stator base through N groups of first bolt holes, N is an even number, and the stator base is formed with M groups of mounting holes for matching the first bolt holes, where M=N+1, and N / 2 groups of idle mounting holes are reserved at both ends of each stator base.

[0013] Furthermore, there are two positioning and tightening mechanisms between every two adjacent stator bases, and each positioning and tightening mechanism includes a straight pin bar, a tooth plate, a screw sleeve, a threaded tail bolt, an insert and a locking bolt. Half of the straight pin bar is a rack structure, and a strip-shaped avoidance gap for the screw sleeve to move is opened in the middle of the rack structure. Half of the straight pin bar is inserted in the profile hole of one stator base, and the rack structure is inserted in the profile hole of the other stator base. The threaded tail bolt passes through the stator base from the outside to the inside and locks one end of the straight pin bar in the corresponding profile hole. The end of the straight pin bar is formed with a first threaded hole for matching the threaded tail bolt, and one end of the threaded bolt passing through the first threaded hole is formed with a section of a positioning shaft, and the top wall of the profile hole is formed with a tensile strength member for inserting the positioning shaft. The invention relates to a hole, a groove for embedding the insert block on the outer side of the corresponding end of the stator base, a central avoidance through hole for the movement of the screw sleeve and the locking bolt is formed in the middle of the insert block, the tooth plate is meshed with the rack structure, one end of the screw sleeve is axially connected to the center of the tooth plate, and a rectangular through hole for the free rotation of the screw sleeve is formed at the center of the tooth plate, and an inclined portion is formed on the side of the insert block away from the threaded tail bolt, and the locking bolt passes through the central avoidance through hole from one side of the inclined portion and is screwed to the screw sleeve, and a circular gasket for the locking bolt to pass through and tighten is fitted on the inclined portion, the outer diameter of the circular gasket is larger than the groove width of the central avoidance through hole and smaller than the width of the insert block, and a strip-shaped deformable through hole parallel to the inclined portion is opened on the insert block for providing a reaction force for the circular gasket.

[0014] Furthermore, an axial groove passing through a rectangular through hole is formed on the top of the tooth plate, and a pin shaft for connecting the rear end of the screw sleeve is arranged in the axial groove. The top of the tooth plate is covered and fixedly connected with a PC cover plate, and the PC cover plate is provided with a central opening for avoiding the rear end of the screw sleeve and an avoidance opening for the pin shaft to escape, and the width of the avoidance opening is smaller than the shaft diameter of the pin shaft.

[0015] Furthermore, the tail end of the locking bolt is axially connected to a curved handle that can drive the locking bolt to rotate, a reinforcing rib is formed on the inner side of the bend of the curved handle, and a handle slot for the curved handle to enter is formed at one end of the insert away from the inclined portion.

[0016] Furthermore, the length of the linear slide rail is smaller than the length of the stator base, and both ends of the stator base are provided with second threaded holes for installing rubber buffer columns, each linear slide rail is located between the two corresponding second threaded holes, and two adjacent linear slide rails are spliced ​​by a short wiring rail, and both ends of the linear slide rail and the short wiring rail are formed with embedded grooves, and the tops of both ends of the short wiring rails are formed with lower pressure plates that can enter the embedded grooves of adjacent linear slide rails, and straight plate pins are provided between the short wiring rail and the adjacent linear slide rails, and the two halves of the straight plate pins are respectively embedded in the embedded grooves on both sides, and the lower pressure plate fits with the top of the straight plate pin, and both ends of the short wiring rail are provided with positioning through holes corresponding to the second threaded holes, and the positioning through holes are provided with extension bolts for screwing downward into the second threaded holes.

[0017] Furthermore, the gap adjustment mechanism includes an L-shaped adapter block, an adjusting bolt, two slide bars symmetrically arranged on both sides of the adjusting bolt, and a guide bolt, the two guide bolts are respectively interference-embedded in the two ends of the L-shaped adapter block, a circular hole for the adjusting bolt to pass through is opened at the center of the L-shaped adapter block, a third threaded hole for the adjusting bolt to be threaded into and two guide through holes located on both sides of the third threaded hole are provided on the side wall of the connecting platform, the two guide bolts are respectively movably inserted in the corresponding guide through holes, both sides of the circular hole are formed with strip slide grooves extending to the corresponding guide through holes, the two slide bars are respectively arranged in the corresponding strip slide grooves, and each slide bar is formed with a first inclined surface at one end close to the adjusting bolt and away from the adjusting bolt. A second inclined surface is formed at one end of the joint bolt, and the adjusting bolt is composed of a screw and a knob part fixed outside the screw, and the knob part is formed with a circle of first beveled part facing the end of the slide bar for slidingly matching the first beveled surface, and the guide bolt is formed with a receiving groove for accommodating the slide bar, and a second beveled part for matching the second beveled surface is formed in the accommodating groove. When the adjusting bolt approaches the connecting platform, the two slide bars move away from each other, and the two guide bolts move in a direction away from the connecting platform, and a sealing plate is fixed on the outer side of each slide bar to prevent the slide bar from falling off outward, and a cylindrical groove for accommodating the knob part is opened on the side wall of the connecting platform, and the third threaded hole is located at the center of the bottom of the cylindrical groove.

[0018] Furthermore, connecting ears are formed at both ends of the L-shaped adapter block, and two screw holes corresponding to the positions of the connecting ears are arranged on the side wall of the connecting platform. An optical axis bolt is screwed into each screw hole, and the optical axis bolt passes through the corresponding connecting ear. A reset spring is sleeved on each optical axis bolt, and the two ends of the reset spring respectively press against the connecting ear and the cap end of the optical axis bolt.

[0019] Furthermore, the bridging fastener is composed of a rectangular base plate, a strip boss and an upper pressure plate. The upper pressure plate and the rectangular base plate are respectively fitted with the protective cover plate from the upper and lower directions. Both ends of the protective cover plate are formed with positioning grooves that match the half-side shape of the strip boss. A plurality of fastening holes are formed on the rectangular base plate. Positioning holes that match the corresponding fastening holes are formed at the ends of the protective cover plate, and an angled inset portion is milled at the upper edge of the positioning groove.

[0020] Furthermore, a detachable straight bar is provided on one side of the stator base, and the scale is fitted on the outside of the straight bar. The length of the straight bar is equal to the length of the stator base. A protruding block protruding outward is formed at the bottom of one end of the straight bar, and a right-angle groove in the same shape as the protrusion is formed at the other end. The length of the protrusion is equal to the thickness of the end plate, and the protrusion and the right-angle groove are fixedly connected by countersunk bolts.

[0021] Compared with the prior art, the present invention has the following beneficial effects: First, high-precision modular splicing breaks through the length limitation. The traditional linear motor has a fixed length and poor splicing accuracy, which leads to unstable movement of the mover and low equipment operation accuracy. The stator base and protective cover of the present invention are spliced ​​by positioning and tightening mechanisms and bridging fasteners respectively, achieving tool-free and fast splicing while ensuring accuracy. The installation setting of the permanent magnet module ensures the continuity of the magnetic field and uniform electromagnetic force, and can be flexibly spliced ​​into different lengths as needed to improve operational stability and accuracy. Second, the flexible adjustment of the detection distance improves adaptability. The existing linear motor readhead and scale have a fixed distance, which is difficult to adjust when used with components of different brands, and relies on plastic gaskets that are easy to lose. The gap adjustment mechanism of the present invention can flexibly adjust the detection distance in the range of 0-5mm without the need for specific gaskets, solving the problem of component adaptation and reducing the cost of use and maintenance; Third, convenient installation and maintenance reduce costs and time. Traditional linear motors are complex to install and difficult to maintain, requiring a large number of tools and disassembly operations. The positioning and tightening mechanism and bridging fasteners of the present invention simplify installation, and each module is easy to disassemble. When a fault occurs, it can be quickly located and replaced, reducing the scope and time of maintenance and improving equipment availability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a three-dimensional schematic diagram of the local structure of the present invention; Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure decomposition; Figure 5 It is a schematic diagram of the three-dimensional structure of the end of the stator base of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the positioning and tightening mechanism of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure decomposition of the tensioning and positioning mechanism of the present invention; Figure 8 is a planar cross-sectional view of the tensioning and positioning mechanism of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure decomposition of the short wiring rail of the present invention; Fig.10 is a planar cross-sectional view of the joint of the straight bars of the scale of the present invention; Fig.11 It is a three-dimensional structural schematic diagram of the connecting platform and the spacing adjustment mechanism of the present invention; Fig.12 yes Fig.11 A schematic diagram of the structure enlargement at point A; Fig.13 is a planar cross-sectional view of the spacing adjustment mechanism of the present invention in a maximum gap state; Fig.14 is a planar cross-sectional view of the spacing adjustment mechanism of the present invention in a minimum gap state; Fig.15 It is a schematic diagram of the three-dimensional structure of the joint of the protective cover plate of the present invention; Fig.16 is a schematic diagram of the three-dimensional structure of the bridging fastener of the present invention; The numbers in the figure are: 1-stator base; 2-permanent magnet module; 3-end plate; 4-connecting platform; 5-linear slide rail; 6-moving core module; 7-protective cover plate; 8-scale; 9-reading head; 10-bridge fastener; 11-positioning and tightening mechanism; 12-first bolt hole; 13-mounting hole; 14-straight pin strip; 15-tooth plate; 16-screw sleeve; 17-threaded tail bolt; 18-embedded block; 19-locking bolt; 20-rack structure; 21-strip avoidance gap; 22-profile hole; 23-positioning shaft; 24-tension hole; 25-center avoidance through hole; 26-rectangular through hole; 27-inclined portion; 28-round gasket; 29-strip deformation through hole; 30-shaft groove; 31-pin shaft; 32-PC cover plate; 33-avoidance; 34-bend handle; 35-reinforcement rib; 36-handle Slot; 37-second threaded hole; 38-short wiring rail; 39-embedded; 40-lower pressure plate; 41-straight pin; 42-lengthened bolt; 43-L-type adapter block; 44-slide; 45-guide bolt; 46-third threaded hole; 47-guide through hole; 48-cylindrical sink groove; 49-strip slide groove; 50-first inclined surface; 51-second inclined surface; 52-screw; 53-knob part; 54- The first beveled portion; 55-accommodating through groove; 56-second beveled portion; 57-sealing plate; 58-connecting ear; 59-optical axis bolt; 60-reset spring; 61-rectangular bottom plate; 62-strip boss; 63-upper pressure plate; 64-positioning notch; 65-fastening hole; 66-positioning hole; 67-beveled pouring portion; 68-straight bar; 69-bump; 70-center opening; 71-countersunk bolt. DETAILED DESCRIPTION

[0023] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figures 1 to 16As shown, a modular linear motor comprises a stator base 1, a plurality of permanent magnet modules 2 fixed on the stator base 1 in a linear arrangement state, end plates 3 fixedly arranged at both ends of the stator base 1, a connecting platform 4 slidably arranged on the stator base 1, two linear slide rails 5 fixed on the stator base 1 for slidingly connecting the two sides of the connecting platform 4, a mover core module 6 fixed to the bottom of the connecting platform 4, a protective cover plate 7 fixedly arranged above the stator base 1 and covering the middle of the connecting platform 4, a scale 8 fixedly arranged on one side of the stator base 1, and a fixed A reading head 9 connected to one side of the connecting platform 4 and matched with the scale 8, the number of the stator base 1 and the protective cover plate 7 is at least one and the number of the two is equal, every two adjacent stator bases 1 are spliced ​​and connected by a positioning and tightening mechanism 11, and every two adjacent protective cover plates 7 are spliced ​​and connected by a bridging fastener 10, and a gap adjustment mechanism for adjusting the distance between the reading head 9 and the scale 8 is provided on one side of the connecting platform 4, each of the permanent magnet modules 2 is fixedly connected to the stator base 1 through N groups of first bolt holes 12, N is an even number, and M groups of mounting holes 13 for matching the first bolt holes 12 are formed on the stator base 1, where M=N+1, and N / 2 groups of idle mounting holes 13 are reserved at both ends of each stator base 1.

[0025] The stator base 1 serves as the basic support structure of the entire linear motor. The permanent magnet modules 2 are arranged linearly and fixedly connected to the parts of the MM = N + 1 groups of mounting holes 13 on the stator base 1 through an even number N of first bolt holes 12. N / 2 groups of free mounting holes 13 are left at both ends of each stator base 1. When multiple stator bases 1 are spliced, these free mounting holes 13 can be used to install a permanent magnet module 2, connecting the left and right rows of permanent magnet modules 2 into one. The end plate 3 is fixed at both ends of the stator base 1 to play a protective and limiting role. The connecting platform 4 is slidably connected to the linear slide rail 5 fixed on the stator base 1 through both sides, and can make linear motion on the stator base 1. The mover core module 6 is fixed at the bottom of the connecting platform 4. When the winding on the stator base 1 is not mentioned in detail in the claims, but is a common component of the linear motor, when current is passed through, the magnetic field generated interacts with the magnetic field of the permanent magnet module 2, driving the mover core module 6 to drive the connecting platform 4 to move along the linear slide rail 5.

[0026] The protective cover plate 7 is fixed on the top of the stator base 1 and covers the middle of the connecting platform 4 to play a protective role. Multiple stator bases 1 are spliced ​​and connected through the positioning and tightening mechanism 11, and multiple protective cover plates 7 are spliced ​​and connected through the bridging fasteners 10 to achieve modular splicing of the linear motor. The scale 8 is fixed on one side of the stator base 1, and the reading head 9 is fixed on one side of the connecting platform 4 and cooperates with the scale 8 to detect the position of the connecting platform 4 in real time and feed it back to the control system to achieve precise control of the motor movement. The gap adjustment mechanism on one side of the connecting platform 4 can adjust the distance between the reading head 9 and the scale 8 to meet the detection distance requirements of scales 8 and reading heads 9 of different brands.

[0027] Achievement purpose or effect: Modular splicing of linear motors is realized, and linear motors of different lengths can be flexibly combined according to actual needs, which improves the applicability and flexibility of the motor. The structural strength and stability after splicing are guaranteed, so that the spliced ​​permanent magnet module 2 forms a whole, improves the motor performance, and can adapt to the detection distance requirements of different brands of scales 8 and reading heads 9.

[0028] There are two positioning and tightening mechanisms 11 between every two adjacent stator bases 1. Each positioning and tightening mechanism 11 includes a straight pin bar 14, a tooth plate 15, a screw sleeve 16, a threaded tail bolt 17, an insert 18 and a locking bolt 19. Half of the straight pin bar 14 is a rack structure 20. The middle of the rack structure 20 is provided with a strip-shaped avoidance notch 21 for the screw sleeve 16 to move. Half of the straight pin bar 14 is inserted into a profile hole 22 of a stator base 1. The rack structure 20 is inserted into the profile hole 22 of another stator base 1, and the threaded tail bolt 17 passes through the stator base 1 from the outside to the inside and locks one end of the straight pin bar 14 in the corresponding profile hole 22. The end of the straight pin bar 14 is formed with a first threaded hole for matching the threaded tail bolt 17, and one end of the threaded bolt passing through the first threaded hole is formed with a positioning shaft 23. The top wall of the profile hole 22 is formed with a tensile hole 24 for inserting the positioning shaft 23. The outer side of the corresponding end of the stator base 1 is formed with an embedding groove for embedding the embedding block 18, and the middle part of the embedding block 18 is formed with a central avoidance through hole 25 for the movement of the screw sleeve 16 and the locking bolt 19. The tooth plate 15 is engaged with the rack structure 20, and one end of the screw sleeve 16 is axially connected to the center of the tooth plate 15. The center of the tooth plate 15 is formed with a rectangular through hole 26 for the screw sleeve 16 to rotate freely. The side of the embedding block 18 away from the threaded tail bolt 17 is formed The shape has an inclined portion 27, and the locking bolt 19 passes through the central avoidance through hole 25 from one side of the inclined portion 27 and is screwed to the screw sleeve 16. A circular gasket 28 for the locking bolt 19 to pass through and tighten is provided on the inclined portion 27. The outer diameter of the circular gasket 28 is larger than the groove width of the central avoidance through hole 25 and smaller than the width of the insert 18. The insert 18 is provided with a strip-shaped deformable through hole 29 parallel to the inclined portion 27 for providing a reaction force for the circular gasket 28.

[0029] The positioning and tightening mechanism 11 is used to connect adjacent stator bases 1. Half of the straight pin bar 14 in each positioning and tightening mechanism 11 is a rack structure 20, and the other half is inserted into the profile hole 22 of one stator base 1. The rack structure 20 is inserted into the profile hole 22 of another stator base 1. The two ends of the straight pin bar 14 are provided with bevel features for convenient and quick alignment and insertion into the profile hole 22. The threaded tail bolt 17 passes through the stator base 1 from the outside to the inside and locks one end of the straight pin bar 14 in the corresponding profile hole 22. The first threaded hole at the end of the straight pin bar 14 cooperates with the threaded tail bolt 17. The threaded bolt passes through the positioning shaft 23 at one end of the first threaded hole and is inserted into the tension hole 24 on the top wall of the profile hole 22 to prevent the straight pin bar 14 from tilting due to lack of support at the upper end of the threaded bolt after being tightened, resulting in looseness between the two stator bases 1.

[0030] The insert block 18 on the outer side of the corresponding end of the stator base 1 is embedded in the embedding groove, and the central avoidance through hole 25 in the middle of the insert block 18 is used for the screw sleeve 16 and the locking bolt 19 to move. The tooth plate 15 is meshed with the rack structure 20, and one end of the screw sleeve 16 is axially connected to the center of the tooth plate 15. The locking bolt 19 is rotated, and the locking bolt 19 passes through the round gasket 28 of the inclined portion 27 of the insert block 18 and the central avoidance through hole 25 and then is screwed with the screw sleeve 16, driving the screw sleeve 16 to move, and the screw sleeve 16 pushes the tooth plate 15 to move along the rack structure 20. Due to the meshing action of the tooth plate 15 and the rack structure 20, the two stator bases 1 are tightened against each other. The strip-shaped deformable through hole 29 on the insert block 18 parallel to the inclined portion 27 provides a reaction force for the round gasket 28 to ensure the stability of the tightening.

[0031] Purpose or effect: To achieve tool-free quick splicing of adjacent stator bases 1, so that the two stator bases 1 always have a tendency to be tightened against each other, thereby ensuring the connection accuracy and stability between the spliced ​​stator bases 1 and improving the overall performance and reliability of the linear motor.

[0032] The top of the tooth plate 15 is formed with an axial groove 30 passing through the rectangular through hole 26, and a pin shaft 31 is arranged in the axial groove 30 for the rear end of the screw sleeve 16 to be axially connected. The top of the tooth plate 15 is covered and fixedly connected with a PC cover plate 32, and the PC cover plate 32 is provided with a central opening 70 for avoiding the rear end of the screw sleeve 16 and an avoidance opening 33 for the pin shaft 31 to escape, and the width of the avoidance opening 33 is smaller than the shaft diameter of the pin shaft 31.

[0033] A pin 31 is arranged in the shaft groove 30 at the top of the tooth plate 15, and the tail of the screw sleeve 16 is axially connected to the pin 31. The PC cover plate covers the top of the tooth plate 15, and the central opening 70 thereon avoids the tail of the screw sleeve 16. The avoidance opening 33 allows the pin 31 to leak out, and the width of the avoidance opening 33 is smaller than the shaft diameter of the pin 31. During assembly, the tail of the screw sleeve 16 is first axially connected to the tooth plate 15 through the pin 31, and then the PC cover plate is covered. The PC cover plate fixes the pin 31, so that the tooth plate 15 and the screw sleeve 16 become a separate parts module, which is convenient for subsequent installation and use, and prevents the pin 31 from falling out.

[0034] Achieve purpose or effect: facilitate the assembly and use of the tooth plate 15 and the screw sleeve 16, and ensure the structural stability and reliability of the positioning and tightening mechanism 11.

[0035] The tail of the locking bolt 19 is axially connected to a curved handle 34 that can drive the locking bolt 19 to rotate. A reinforcing rib 35 is formed on the inner side of the bend of the curved handle 34. The end of the insert 18 away from the inclined portion 27 is provided with a handle slot 36 for the curved handle 34 to enter.

[0036] The tail of the locking bolt 19 is axially connected to the curved handle 34. A reinforcing rib 35 is provided inside the curved handle 34. A handle slot 36 is provided at one end of the insert block 18 away from the inclined surface 27. The operator rotates the curved handle 34 to drive the locking bolt 19 to rotate, thereby realizing the tightening operation of the positioning and tightening mechanism 11. The curved handle 34 is inserted into the handle slot 36 by utilizing the elastic deformation space provided by the strip-shaped deformable through hole 29, similar to the quick-release structure of the front wheel axle of a bicycle. The reinforcing rib 35 enhances the strength of the curved handle 34 to ensure that the curved handle 34 will not be damaged during operation.

[0037] Achieved purpose or effect: It is convenient for operators to operate the positioning and tightening mechanism 11, improves the efficiency of splicing and disassembly, and ensures the reliability of operation.

[0038] The length of the linear slide rail 5 is less than the length of the stator base 1, and both ends of the stator base 1 are provided with second threaded holes 37 for installing rubber buffer columns, each linear slide rail 5 is located between the corresponding two second threaded holes 37, and two adjacent linear slide rails 5 are spliced ​​by a short wiring rail 38, and both ends of the linear slide rail 5 and the short wiring rail 38 are formed with inlays 39, and the tops of both ends of the short wiring rail 38 are formed with lower pressure plates 40 that can enter the inlays 39 of the adjacent linear slide rails 5, and a straight plate pin 41 is provided between the short wiring rail 38 and the adjacent linear slide rails 5, and the two halves of the straight plate pin 41 are respectively embedded in the inlays 39 on both sides, and the lower pressure plate 40 fits with the top of the straight plate pin 41, and both ends of the short wiring rail 38 are provided with positioning through holes corresponding to the second threaded holes 37, and the positioning through holes are provided with extension bolts 42 for screwing downward into the second threaded holes 37.

[0039] The length of the linear guide rail 5 is smaller than that of the stator base 1. The second threaded holes 37 at both ends of the stator base 1 are used to install rubber buffer columns, which play a buffering role and reduce the impact force when the connecting platform 4 moves to both ends of the stator base 1. Adjacent linear guide rails 5 are spliced ​​by short wiring rails 38. The lower pressure plates 40 at the top of both ends of the short wiring rails 38 can enter the inlays 39 of the adjacent linear guide rails 5. The two halves of the straight plate pin 41 are respectively embedded in the inlays 39 on both sides, and the lower edge of the straight plate pin 41 is processed with an angled feature to facilitate smooth downward embedding into the inlays 39. The lower pressure plate 40 fits on the top of the straight plate pin 41. The positioning holes at both ends of the short wiring rail 38 correspond to the second threaded holes 37. By gradually tightening the extension bolts 42 in the positioning holes, the lower pressure plate 40 gradually presses the straight plate pin 41 completely downward to achieve the splicing of adjacent linear guide rails 5.

[0040] Achieve the purpose or effect: ensure the accuracy and stability of the linear slide 5 after splicing, so that the connecting platform 4 can slide smoothly on the linear slide 5, and at the same time, the setting of the rubber buffer column prolongs the service life of the linear motor and reduces the damage of the equipment.

[0041] The gap adjustment mechanism includes an L-shaped adapter block 43, an adjusting bolt, two slide bars 44 symmetrically arranged on both sides of the adjusting bolt, and a guide bolt 45. The two guide bolts 45 are respectively inserted into the two ends of the L-shaped adapter block 43 through interference. A circular hole for the adjusting bolt to pass through is opened at the center of the L-shaped adapter block 43. A third threaded hole 46 for the adjusting bolt to be screwed in and two guide through holes 47 located on both sides of the third threaded hole 46 are provided on the side wall of the connecting platform 4. The two guide bolts 45 are respectively movably inserted in the corresponding guide through holes 47. Both sides of the circular hole are formed with strip slide grooves 49 extending to the corresponding guide through holes 47. The two slide bars 44 are respectively arranged in the corresponding strip slide grooves 49. Each slide bar 44 is formed with a first inclined surface 50 at one end close to the adjusting bolt and a second inclined surface 50 at one end away from the adjusting bolt. The inclined surface 51, the adjusting bolt is composed of a screw rod 52 and a knob portion 53 fixed outside the screw rod 52, the knob portion 53 is formed with a first bevel portion 54 for slidingly matching the first bevel 50 at one end facing the slide bar 44, the guide bolt 45 is formed with a receiving groove 55 for accommodating the slide bar 44, and the receiving groove 55 is formed with a second bevel portion 56 for matching the second bevel 51. When the adjusting bolt approaches the connecting platform 4, the two slide bars 44 move away from each other, and the two guide bolts 45 move in a direction away from the connecting platform 4. A sealing plate 57 is fixedly arranged on the outer side of each slide bar 44 to prevent the slide bar 44 from falling off outward. A cylindrical recessed groove 48 for accommodating the knob portion 53 is provided on the side wall of the connecting platform 4, and the third threaded hole 46 is located at the center of the bottom of the cylindrical recessed groove 48.

[0042] The L-shaped adapter block of the gap adjustment mechanism is movably connected to the guide through hole 47 of the side wall of the connecting platform 4 through the guide bolts 45 inserted at both ends, and the adjustment bolt passes through the circular hole in the center of the L-shaped adapter block and is threadedly connected to the third threaded hole 46 of the side wall of the connecting platform 4. The slide bar 44 is arranged in the strip-shaped slide groove 49, and has a first inclined surface 50 and a second inclined surface 51 at both ends, and the knob portion 53 of the adjustment bolt has a first bevel portion 54, and the guide bolt 45 has a receiving groove 55 and a second bevel portion 56 for receiving the slide bar 44. When the knob portion 53 of the adjustment bolt is turned to make the adjustment bolt approach the connecting platform 4, the first bevel portion 54 of the knob portion 53 slides with the first bevel 50 of the slide bar 44, so that the two slide bars 44 are separated from each other. The second inclined surface 51 of the slide bar 44 cooperates with the second bevel portion 56 of the guide bolt 45 to push the guide bolt 45 to move away from the connecting platform 4, thereby adjusting the distance between the reading head 9 and the scale 8. The adjustment range is 0-5mm, which covers the detection gap specifications of almost all brands of reading heads 9.

[0043] Purpose or effect achieved: The detection distance between the reading head 9 and the scale 8 can be flexibly adjusted to meet the detection gap requirements of scales 8 and reading heads 9 of different brands, thereby improving the versatility and applicability of the linear motor.

[0044] Both ends of the L-shaped adapter block 43 are formed with connecting ears 58, and two screw holes corresponding to the positions of the connecting ears 58 are arranged on the side wall of the connecting platform 4. An optical axis bolt 59 is screwed into each screw hole, and the optical axis bolt 59 passes through the corresponding connecting ear 58. A reset spring 60 is sleeved on each optical axis bolt 59, and the two ends of the reset spring 60 respectively press against the connecting ear 58 and the cap end of the optical axis bolt 59.

[0045] The connecting ears 58 at both ends of the L-shaped transfer block are connected to the side wall of the connecting platform 4 through the optical axis bolt 59. The optical axis bolt 59 is sleeved with a reset spring 60, and the two ends of the spring are respectively pressed against the connecting ears 58 and the cap end of the optical axis bolt 59. When the adjusting bolt is adjusted to move the guide bolt 45, the reset spring 60 will generate elastic force. When the adjusting bolt rotates in the opposite direction, the elastic force of the reset spring 60 can reset the L-shaped transfer block and the guide bolt 45, thereby ensuring the stability and repeatability of the adjustment process.

[0046] Purpose or effect achieved: To ensure the adjustment accuracy and stability of the gap adjustment mechanism, to make the distance adjustment between the reading head 9 and the scale 8 more accurate and reliable, and to facilitate the resetting operation of the adjustment mechanism.

[0047] The bridging fastener 10 is composed of a rectangular base plate 61, a strip boss 62 and an upper pressure plate 63. The upper pressure plate 63 and the rectangular base plate 61 are respectively attached to the protective cover plate 7 from the upper and lower directions. Both ends of the protective cover plate 7 are formed with positioning grooves 64 that match the half-side shape of the strip boss 62. A plurality of fastening holes 65 are formed on the rectangular base plate 61. Positioning holes 66 that match the corresponding fastening holes 65 are formed at the end of the protective cover plate 7. An angled inset portion 67 is milled at the upper edge of the positioning groove 64.

[0048] The rectangular bottom plate 61 and the upper pressing plate 63 of the bridge fastener 10 fit the protective cover plate 7 from the upper and lower directions respectively, and the strip boss 62 matches the positioning notch 64 at the end of the protective cover plate 7, and the upper edge of the positioning notch 64 has an angled inset 67, which facilitates the smooth insertion of the edge of the protective cover plate 7. The fastening hole 65 on the rectangular bottom plate 61 matches the positioning hole 66 at the end of the protective cover plate 7, and the bridge fastener 10 is fixed to the protective cover plate 7 by passing the bolt through the fastening hole 65 and the positioning hole 66, so that the adjacent protective cover plates 7 are firmly connected.

[0049] Achieve the purpose or effect: ensure the stability of adjacent protective cover plates 7 after splicing, prevent the protective cover plates 7 from sinking, make the structural strength after connection close to the integrated structure, and improve the protective effect of the protective cover plates 7 and the stability of the overall structure.

[0050] A detachable straight bar 68 is provided on one side of the stator base 1, and the scale 8 is fitted on the outer side of the straight bar 68. The length of the straight bar 68 is equal to the length of the stator base 1. A protruding block 69 is formed at the bottom of one end of the straight bar 68, and a right-angle groove in the same shape as the protrusion 69 is formed at the other end. The length of the protrusion 69 is equal to the thickness of the end plate 3, and the protrusion 69 is fixedly connected to the right-angle groove by a countersunk bolt 71.

[0051] The straight bar 68 on one side of the stator base 1 is detachable, and the scale 8 is attached to the outside of the straight bar 68. There is a convex block 69 at the bottom of one end of the straight bar 68, and a right-angle groove at the other end. The convex block 69 and the right-angle groove are fixedly connected by a countersunk bolt 71. During installation, the straight bar 68 is installed on one side of the stator base 1. Through the cooperation of the convex block 69 and the right-angle groove and the fixation of the countersunk bolt 71, the straight bar 68 is tightly connected to the stator base 1, ensuring the relative position accuracy of the scale 8 and the stator base 1, and facilitating the installation and removal of the scale 8.

[0052] Achieved purpose or effect: facilitates installation and maintenance of the scale 8, while ensuring the relative position accuracy of the scale 8 and the stator base 1, and improving the accuracy of the position detection of the reading head 9.

[0053] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A modular linear motor, comprising a stator base, a plurality of permanent magnet modules fixed on the stator base in a linear arrangement, end plates fixedly arranged at both ends of the stator base, a connecting platform slidably arranged on the stator base, two linear slide rails fixed on the stator base for slidingly connecting the two sides of the connecting platform, a mover core module fixed at the bottom of the connecting platform, a protective cover plate fixedly arranged above the stator base and covering the middle of the connecting platform, a scale fixedly arranged on one side of the stator base, and a reading head fixedly connected to one side of the connecting platform and matched with the scale, characterized in that: The number of the stator base and the protective cover plate is at least one and the number of the two is equal. Every two adjacent stator bases are spliced ​​and connected by a positioning and tightening mechanism, and every two adjacent protective cover plates are spliced ​​and connected by a bridging fastener. A gap adjustment mechanism for adjusting the distance between the reading head and the scale is provided on one side of the connecting platform. Each of the permanent magnet modules is fixedly connected to the stator base through N groups of first bolt holes, N is an even number, and M groups of mounting holes for matching the first bolt holes are formed on the stator base, where M=N+1, and N / 2 groups of idle mounting holes are reserved at both ends of each stator base.

2. A modular linear motor according to claim 1, characterized in that: There are two positioning and tightening mechanisms between every two adjacent stator bases, and each positioning and tightening mechanism includes a straight pin bar, a tooth plate, a screw sleeve, a threaded tail bolt, an insert and a locking bolt. Half of the straight pin bar is a rack structure, and a strip-shaped avoidance gap for the screw sleeve to move is opened in the middle of the rack structure. Half of the straight pin bar is inserted in a profile hole of one stator base, and the rack structure is inserted in a profile hole of another stator base. The threaded tail bolt passes through the stator base from the outside to the inside and locks one end of the straight pin bar in the corresponding profile hole. A first threaded hole for matching the threaded tail bolt is formed at the end of the straight pin bar, and a section of a positioning shaft is formed at one end of the threaded bolt passing through the first threaded hole. A tension-resistant hole for inserting the positioning shaft is formed on the top wall of the profile hole. The outer side of the corresponding end of the stator base is formed with an embedding groove for embedding with an embedding block, and the middle part of the embedding block is formed with a central avoidance through hole for the movement of the screw sleeve and the locking bolt. The tooth plate is meshed with the rack structure, and one end of the screw sleeve is axially connected to the center of the tooth plate. The center of the tooth plate is formed with a rectangular through hole for the screw sleeve to rotate freely. The side of the embedding block away from the threaded tail bolt is formed with an inclined portion, and the locking bolt passes through the central avoidance through hole from one side of the inclined portion and is screwed with the screw sleeve. A circular gasket for the locking bolt to pass through and tighten is fitted on the inclined portion, and the outer diameter of the circular gasket is larger than the groove width of the central avoidance through hole and smaller than the width of the embedding block. The embedding block is provided with a strip-shaped deformable through hole parallel to the inclined portion for providing a reaction force for the circular gasket.

3. A modular linear motor according to claim 2, characterized in that: The top of the tooth plate is formed with an axial groove passing through a rectangular through hole, and a pin shaft for connecting the rear end of the screw sleeve is arranged in the axial groove. The top of the tooth plate is covered and fixedly connected with a PC cover plate, and the PC cover plate is provided with a central opening for avoiding the rear end of the screw sleeve and an avoidance opening for the pin shaft to escape, and the width of the avoidance opening is smaller than the shaft diameter of the pin shaft.

4. A modular linear motor according to claim 2, characterized in that: The tail end of the locking bolt is axially connected to a curved handle that can drive the locking bolt to rotate. A reinforcing rib is formed on the inner side of the bent portion of the curved handle. A handle slot for the curved handle to enter is formed at one end of the insert away from the inclined portion.

5. The modular linear motor according to claim 1, characterized in that: The length of the linear slide rail is smaller than the length of the stator base, and both ends of the stator base are provided with second threaded holes for installing rubber buffer columns, each linear slide rail is located between the two corresponding second threaded holes, and two adjacent linear slide rails are spliced ​​by a short wiring rail, and both ends of the linear slide rail and the short wiring rail are formed with embedded openings, and the tops of both ends of the short wiring rails are formed with lower pressure plates that can enter the embedded openings of adjacent linear slide rails, and straight plate pins are provided between the short wiring rails and the adjacent linear slide rails, and the two halves of the straight plate pins are respectively embedded in the embedded openings on both sides, and the lower pressure plate fits with the top of the straight plate pin, and both ends of the short wiring rails are provided with positioning through holes corresponding to the second threaded holes, and the positioning through holes are provided with extension bolts for screwing downward into the second threaded holes.

6. The modular linear motor according to claim 1, characterized in that: The gap adjustment mechanism includes an L-shaped adapter block, an adjusting bolt, two slide bars symmetrically arranged on both sides of the adjusting bolt, and a guide bolt. The two guide bolts are respectively inserted into the two ends of the L-shaped adapter block with interference fit. A circular hole for the adjusting bolt to pass through is opened at the center of the L-shaped adapter block. A third threaded hole for the adjusting bolt to be threaded in and two guide through holes located on both sides of the third threaded hole are provided on the side wall of the connecting platform. The two guide bolts are respectively movably inserted in the corresponding guide through holes. Both sides of the circular hole are formed with strip slide grooves extending to the corresponding guide through holes. The two slide bars are respectively arranged in the corresponding strip slide grooves. The end of each slide bar close to the adjusting bolt is formed with a first inclined surface, which is away from the adjusting bolt. A second inclined surface is formed at one end, and the adjusting bolt is composed of a screw and a knob part fixed outside the screw, and the knob part is formed with a circle of first beveled part for slidingly matching the first beveled surface at one end of the sliding bar, and a receiving groove for accommodating the sliding bar is formed on the guide bolt, and a second beveled part for matching the second beveled surface is formed in the accommodating groove. When the adjusting bolt approaches the connecting platform, the two sliding bars move away from each other, and the two guide bolts move in a direction away from the connecting platform. A sealing plate is fixed on the outer side of each sliding bar to prevent the sliding bar from falling outward, and a cylindrical groove for accommodating the knob part is opened on the side wall of the connecting platform, and the third threaded hole is located at the center of the bottom of the cylindrical groove.

7. A modular linear motor according to claim 6, characterized in that: Both ends of the L-shaped adapter block are formed with connecting ears, and two screw holes corresponding to the positions of the connecting ears are arranged on the side wall of the connecting platform. An optical axis bolt is screwed into each screw hole, and the optical axis bolt passes through the corresponding connecting ear. A reset spring is sleeved on each optical axis bolt, and the two ends of the reset spring respectively press against the connecting ear and the cap end of the optical axis bolt.

8. The modular linear motor according to claim 1, characterized in that: The bridging fastener is composed of a rectangular base plate, a strip boss and an upper pressure plate. The upper pressure plate and the rectangular base plate are respectively fitted with the protective cover plate from the upper and lower directions. Both ends of the protective cover plate are formed with positioning grooves that match the half-side shape of the strip boss. A plurality of fastening holes are formed on the rectangular base plate. Positioning holes that match the corresponding fastening holes are formed on the end of the protective cover plate. An angled inset portion is milled at the upper edge of the positioning groove.

9. The modular linear motor according to claim 1, characterized in that: A detachable straight bar is provided on one side of the stator base, and the scale is fitted on the outside of the straight bar. The length of the straight bar is equal to the length of the stator base. A protruding block protruding outward is formed at the bottom of one end of the straight bar, and a right-angle groove in the same shape as the protrusion is formed at the other end. The length of the protrusion is equal to the thickness of the end plate, and the protrusion and the right-angle groove are fixedly connected by countersunk bolts.

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