A modular linear motor

Abstract

The present invention relates to a modular linear motor, aiming to solve the problems of limited length of the existing linear motor, poor adaptability of components, inconvenient installation and maintenance, etc. The linear motor includes components such as a stator base, a permanent magnet module, a connecting table, and a mover core module. The stator base and the protective cover plate can be spliced respectively through a positioning and tensioning mechanism and a bridging fastener to achieve modular combination, ensuring splicing accuracy and structural strength, making the magnetic field continuous and the electromagnetic force uniform. A gap adjustment mechanism is provided on one side of the connecting table, which can flexibly adjust the distance between the reading head and the grating scale within 0-5 mm to adapt to components of different brands. In addition, tool-free quick splicing and modular design simplify the installation process, facilitate the quick replacement of faulty components, reduce the use and maintenance costs, and improve the operation stability and availability of the equipment.

Description

Technical Field

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

[0002] As a transmission device that can directly convert electrical energy into linear motion mechanical energy, linear motors play a crucial role in many fields such as industrial automation, numerical control machine tools, semiconductor manufacturing, and logistics transportation. Different from traditional rotary motors that convert rotary motion into linear motion through complex intermediate conversion mechanisms such as gears, chains, and lead screws, linear motors have significant advantages such as simple structure, fast response speed, high positioning accuracy, smooth motion, and low noise, which can greatly improve the operation 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 includes an iron core and windings. When the windings are energized, a magnetic field is generated; the mover, depending on the type of linear motor, includes a magnetic conductor, a secondary conductor, or a permanent magnet, etc., and interacts with the stator magnetic field to generate an electromagnetic force to drive the mover to perform linear motion. To ensure the accuracy and stability of linear motion, auxiliary components such as a support and guiding device (such as a linear guide rail), a position detection device (such as a grating scale, an encoder), and a cooling device are also equipped.

[0004] However, with the increasingly diverse and personalized industrial production requirements, the existing linear motor technology gradually exposes some defects that are difficult to meet actual applications.

[0005] Length limitation problem: Traditional linear motors usually adopt a fixed length specification during the design and manufacturing stage. When users need a longer stroke of linear motion, it is difficult to find a standard length linear motor product that meets the requirements. If multiple standard length linear motors are spliced together to achieve long-stroke motion, the existing splicing methods have problems with difficult accuracy guarantee. The magnetic field continuity between the stator and the mover at the splicing point is easily affected, resulting in uneven distribution of electromagnetic force, causing the mover to experience unstable motion and jitter when passing through the splicing point, seriously affecting the operation accuracy and stability of the equipment.

[0006] Component adaptation problem: In actual industrial application scenarios, in order to meet diverse production requirements, optimize costs, or utilize the advantages of different brand components, users often try to freely combine and use linear motors, grating scales, and reading heads of different brands. However, there are significant differences in the design concepts, manufacturing processes, and technical standards among linear motors, grating scales, and reading heads of different brands.

[0007] For example, the detection distance specifications between grating scales and reading heads of different brands vary. The optimal detection distance between some reading heads and grating scales may be only 1 - 2 mm, while for others it may be 3 - 5 mm. In the design of existing linear motors, the distance between the reading head and the grating scale is usually fixedly set, making it difficult to flexibly adjust according to different brands or models of grating scales and reading heads actually used in combination.

[0008] In addition, many reading heads must be used in conjunction with specific plastic shims during installation. These plastic shims are used to precisely adjust the distance between the reading head and the grating scale. However, the plastic shims are small in size and easily lost. Once lost, it becomes very difficult to adjust the detection distance when reinstalling the grating scale, and may even lead to abnormal installation and use. This makes it necessary for users to carry out 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 usage cost and maintenance difficulty, but may also affect the performance and stability of the linear motor due to improper modification.

[0009] Installation and maintenance issues: When installing existing linear motors in a spliced manner, they often rely on a large number of tools and complex operation steps, which not only reduces the installation efficiency but also places high requirements on the technical level of installers. During maintenance, due to their complex structure and strong correlation between components, once a component fails, a large number of related components may need to be disassembled 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 installation and maintenance convenience. Summary of the Invention

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

[0012] To solve the problems of the existing technology, the technical solution adopted by the present invention is as follows:

[0013] A modular linear motor, comprising a stator base, a plurality of groups of permanent magnet modules fixedly arranged 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 fixedly arranged on the stator base for the two sides of the connecting platform to slide and connect, a mover iron core module fixedly arranged 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 grating ruler fixedly arranged on one side of the stator base, and a reading head fixedly connected to one side of the connecting platform and cooperating with the grating ruler. The number of the stator base and the protective cover plate is at least one and they are equal in number. Each two adjacent stator bases are spliced and connected through a positioning and tensioning mechanism, and each two adjacent protective cover plates are spliced and connected through a bridging fastener. A gap adjusting mechanism for adjusting the distance between the reading head and the grating ruler is arranged on one side of the connecting platform. Each permanent magnet module is fixedly connected to the stator base through N groups of first bolt holes, N is an even number, M groups of mounting holes for cooperating with the first bolt holes are formed on the stator base, where M = N + 1, and N / 2 groups of idle mounting holes are left at both ends of each stator base.

[0014] Further, the number of the positioning and tensioning mechanisms between each two adjacent stator bases is two. Each positioning and tensioning mechanism includes a straight pin strip, a toothed plate, a screw sleeve, a threaded end bolt, an insert block, and a locking bolt. Half of the straight pin strip is a rack structure, a strip-shaped avoidance notch for the screw sleeve to move is formed in the middle of the rack structure. Half of the straight pin strip is inserted into the profile hole of one stator base, and the rack structure is inserted into the profile hole of the other stator base. The threaded end bolt passes through the stator base from outside to inside and locks one end of the straight pin strip in the corresponding profile hole. A first threaded hole for cooperating with the threaded end bolt is formed at the end of the straight pin strip. A section of positioning shaft is formed at one end of the threaded bolt passing through the first threaded hole. A tensile hole for the positioning shaft to insert is formed on the top wall of the profile hole. An insertion groove for the insert block to be inserted is formed on the outer side of the corresponding end of the stator base. A central avoidance through hole for the screw sleeve and the locking bolt to move is formed in the middle of the insert block. The toothed plate meshes with the rack structure. One end of the screw sleeve is axially connected to the center of the toothed plate. A rectangular through hole for the screw sleeve to freely rotate is formed at the center of the toothed plate. An inclined surface portion is formed on one side of the insert block away from the threaded end bolt. The locking bolt passes through the central avoidance through hole from the side of the inclined surface portion and is screwed with the screw sleeve. A round gasket for the locking bolt to pass through and abut against is attached to the inclined surface portion. The outer diameter of the round gasket is larger than the groove width of the central avoidance through hole and smaller than the width of the insert block. A strip-shaped deformation through hole parallel to the inclined surface portion is formed on the insert block for providing a reaction force for the round gasket.

[0015] Further, a shaft groove passing through a rectangular through hole is formed at the top of the toothed plate. A pin shaft for pivotally connecting the tail of the screw sleeve is arranged in the shaft groove. A PC cover plate is fixedly connected and covered on the top of the toothed plate. A central opening for avoiding the tail of the screw sleeve and an avoidance opening for the pin shaft to leak out are formed on the PC cover plate. The width of the avoidance opening is smaller than the shaft diameter of the pin shaft.

[0016] Further, a bent handle capable of driving the locking bolt to rotate is pivotally connected to the tail of the locking bolt. Reinforcing ribs are formed on the inner side of the bent portion of the bent handle. A handle card slot for the bent handle to enter is formed at one end of the insert block away from the inclined surface portion.

[0017] Further, the length of the linear slide rail is smaller than the length of the stator base. Second threaded holes for installing rubber buffer columns are arranged at both ends of the stator base. Each linear slide rail is located between two corresponding second threaded holes. Two adjacent linear slide rails are spliced by a short connecting rail. Embedding mouths are formed at both ends of the linear slide rail and the short connecting rail. Lower pressing plates capable of entering the embedding mouths of the adjacent linear slide rails are formed at the tops of both ends of the short connecting rail. Straight plate pins are arranged between the short connecting rail and the adjacent linear slide rails. The two halves of the straight plate pin are respectively embedded into the embedding mouths on both sides. The lower pressing plate is attached to the top of the straight plate pin. Positioning through holes corresponding to the second threaded holes are arranged at both ends of the short connecting rail. Extension bolts for screwing downward into the second threaded holes are arranged in the positioning through holes.

[0018] Further, 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 guiding bolt. The two guiding bolts are press-fitted into both ends of the L-shaped adapter block respectively. A round hole for the adjusting bolt to pass through is formed at the center of the L-shaped adapter block. A third threaded hole for the adjusting bolt to be screwed into and two guiding through holes located on both sides of the third threaded hole are provided on the side wall of the connecting platform. The two guiding bolts are respectively inserted into the corresponding guiding through holes movably. Strip-shaped sliding grooves extending to the corresponding guiding through holes are formed on both sides of the round hole. The two slide bars are respectively arranged in the corresponding strip-shaped sliding grooves. A first inclined surface is formed at one end of each slide bar close to the adjusting bolt, and a second inclined surface is formed at the end far from the adjusting bolt. The adjusting bolt consists of a screw rod and a knob part fixed outside the screw rod. A first beveled angle part for sliding cooperation with the first inclined surface is formed in a circle at one end of the knob part facing the slide bar. A receiving through groove for accommodating the slide bar is formed on the guiding bolt, and a second beveled angle part for cooperating with the second inclined surface is formed in the receiving through groove. When the adjusting bolt approaches the connecting platform, the two slide bars move away from each other, and the two guiding bolts move away from the connecting platform. A sealing plate for preventing the slide bar from falling off outward is fixedly arranged on the outer side of each slide bar. A cylindrical counterbore for accommodating the knob part is formed on the side wall of the connecting platform. The third threaded hole is located at the center of the bottom of the cylindrical counterbore.

[0019] Further, connection ears are formed at both ends of the L-shaped adapter block. Two screw holes corresponding to the positions of the connection ears are provided on the side wall of the connecting platform. A smooth shaft bolt is screwed into each screw hole. The smooth shaft bolt passes through the corresponding connection ear. A return spring is sleeved on each smooth shaft bolt. The two ends of the return spring respectively abut against the connection ear and the cap end of the smooth shaft bolt.

[0020] Further, the bridging fastener consists of a rectangular bottom plate, a strip-shaped convex column, and an upper pressing plate. The upper pressing plate and the rectangular bottom plate are respectively attached to the protective cover plate from the upper and lower directions. Positioning notch grooves matching half of the shape of the strip-shaped convex column are formed at both ends of the protective cover plate. A plurality of fastening holes are formed on the rectangular bottom plate. Positioning holes matching the corresponding fastening holes are formed at the end of the protective cover plate. A beveled angle pouring part is milled at the upper edge of the positioning notch groove.

[0021] Further, a detachable straight bar is arranged on one side of the stator base. The grating scale is attached to the outer side of the straight bar. The length of the straight bar is equal to the length of the stator base. A convex block protruding outward is formed at the bottom of one end of the straight bar, and a right-angle groove with the same shape as the convex block is formed at the other end. The length of the convex block is equal to the thickness of the end plate. The convex block and the right-angle groove are fixedly connected by a countersunk head bolt.

[0022] The beneficial effects of the present invention compared with the prior art are as follows:

[0023] First, the high-precision modular splicing breaks through the length limit. The length of traditional linear motors is fixed, and the splicing accuracy is poor, resulting in unstable movement of the mover and low operating accuracy of the equipment. In the present invention, the stator base and the protective cover plate are spliced through a positioning and tensioning mechanism and a bridging fastener respectively, realizing quick tool-free splicing and ensuring accuracy. The installation of the permanent magnet module ensures continuous magnetic field and uniform electromagnetic force, and can be flexibly spliced into different lengths as required, improving the operating stability and accuracy;

[0024] Second, the flexible adjustment of the detection distance improves the adaptability. The distance between the reading head and the grating ruler of the existing linear motor is fixed, making it difficult to adjust when matching different brand components, and relying on plastic shims that are easily lost. The gap adjustment mechanism of the present invention can flexibly adjust the detection distance in the range of 0 - 5 mm, without the need for specific shims, solving the problem of component adaptation and reducing the use and maintenance costs;

[0025] Third, the convenient installation and maintenance reduce costs and time. The installation of traditional linear motors is complex and the maintenance is difficult, requiring a large number of tools and disassembly operations. The positioning and tensioning mechanism and the bridging fastener of the present invention simplify the installation, and each module is easy to disassemble. When a fault occurs, it can be quickly located and replaced, reducing the maintenance scope and time and improving the equipment availability. Description of the Drawings

[0026] Figure 1 is a schematic three-dimensional structure of the present invention Figure 1 ;

[0027] Figure 2 is a schematic three-dimensional structure of the present invention Figure 2 ;

[0028] Figure 3 is a schematic three-dimensional view of a partial structure of the present invention;

[0029] Figure 4 is Figure 3 a schematic exploded three-dimensional structure of

[0030] Figure 5 is a schematic three-dimensional structure of the end of the stator base of the present invention;

[0031] Figure 6 is a schematic three-dimensional structure of the positioning and tensioning mechanism of the present invention;

[0032] Figure 7 is a schematic exploded three-dimensional structure of the tensioning and positioning mechanism of the present invention;

[0033] Figure 8 is a schematic plan sectional view of the tensioning and positioning mechanism of the present invention;

[0034] Figure 9 is a schematic exploded three-dimensional structure of the short connecting rail of the present invention;

[0035] Figure 10 is a plan sectional view of the straight bar splicing part of the grating ruler of the present invention;

[0036] Figure 11 is a three-dimensional structural schematic diagram of the connecting table and the spacing adjusting mechanism of the present invention;

[0037] Figure 12 is Figure 11 an enlarged schematic view of the structure at position A in

[0038] Figure 13 is a plan sectional view of the spacing adjusting mechanism of the present invention in the maximum clearance state;

[0039] Figure 14 is a plan sectional view of the spacing adjusting mechanism of the present invention in the minimum clearance state;

[0040] Figure 15 is a three-dimensional structural schematic diagram of the splicing part of the protective cover plate of the present invention;

[0041] Figure 16 is a three-dimensional structural schematic diagram of the bridging fastener of the present invention;

[0042] The reference numerals in the figure are: 1 - stator base; 2 - permanent magnet module; 3 - end plate; 4 - connecting table; 5 - linear slide rail; 6 - rotor iron core module; 7 - protective cover plate; 8 - grating ruler; 9 - reading head; 10 - bridging fastener; 11 - positioning and tensioning mechanism; 12 - first bolt hole; 13 - mounting hole; 14 - straight bar; 15 - toothed plate; 16 - screw sleeve; 17 - threaded tail bolt; 18 - insert block; 19 - locking bolt; 20 - rack structure; 21 - strip-shaped avoidance notch; 22 - profile hole; 23 - positioning shaft; 24 - tensile hole; 25 - central avoidance through hole; 26 - rectangular through hole; 27 - inclined surface part; 28 - round gasket; 29 - strip-shaped deformation through hole; 30 - shaft groove; 31 - pin shaft; 32 - PC cover plate; 33 - avoidance opening; 34 - bent handle; 35 - reinforcing rib; 36 - handle card slot; 37 - second threaded hole; 38 - short connection rail; 39 - insertion opening; 40 - lower pressing plate; 41 - straight plate pin; 42 - lengthening bolt; 43 - L-shaped adapter block; 44 - slide bar; 45 - guiding bolt; 46 - third threaded hole; 47 - guiding through hole; 48 - cylindrical sink; 49 - strip-shaped sliding groove; 50 - first inclined surface; 51 - second inclined surface; 52 - screw; 53 - knob part; 54 - first beveled part; 55 - accommodating through groove; 56 - second beveled part; 57 - sealing plate; 58 - connecting ear; 59 - optical axis bolt; 60 - return spring; 61 - rectangular bottom plate; 62 - strip-shaped convex column; 63 - upper pressing plate; 64 - positioning notch; 65 - fastening hole; 66 - positioning hole; 67 - beveled pouring part; 68 - straight bar; 69 - convex block; 70 - central opening; 71 - countersunk head bolt. Detailed implementation mode

[0043] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Refer to Figures 1 to 16 As shown, a modular linear motor includes a stator base 1, a plurality of groups of permanent magnet modules 2 fixedly arranged in a linear arrangement on the stator base 1, 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 fixedly arranged on the stator base 1 for slidably connecting both sides of the connecting platform 4, a mover iron core module 6 fixedly arranged at 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 grating ruler 8 fixedly arranged on one side of the stator base 1, and a reading head 9 fixedly connected to one side of the connecting platform 4 and cooperating with the grating ruler 8. The number of the stator base 1 and the protective cover plate 7 is at least one and they are equal. Each two adjacent stator bases 1 are spliced and connected through a positioning and tensioning mechanism 11, and each two adjacent protective cover plates 7 are spliced and connected through a bridging fastener 10. A gap adjustment mechanism for adjusting the distance between the reading head 9 and the grating ruler 8 is arranged on one side of the connecting platform 4. Each permanent magnet module 2 is fixedly connected to the stator base 1 through N groups of first bolt holes 12, N is an even number, M groups of mounting holes 13 for cooperating with 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 left at both ends of each stator base 1.

[0045] 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 a part of the M (M = N + 1) groups of mounting holes 13 on the stator base 1 through an even number of N groups of first bolt holes 12, and N / 2 groups of idle mounting holes 13 are left at both ends of each stator base 1. When multiple stator bases 1 are spliced, these idle mounting holes 13 can be used to install a permanent magnet module 2 to connect the left and right rows of permanent magnet modules 2 into one body. The end plates 3 are fixed at both ends of the stator base 1 to play a role in protection and limitation. The connecting platform 4 is slidably connected to the linear slide rails 5 fixed on the stator base 1 through both sides and can perform linear motion on the stator base 1. The mover iron core module 6 is fixed at the bottom of the connecting platform 4. When a current is passed through the windings on the stator base 1 (not detailed in the claims but a common component of a linear motor), the generated magnetic field interacts with the magnetic field of the permanent magnet module 2 to drive the mover iron core module 6 to drive the connecting platform 4 to move along the linear slide rails 5.

[0046] The protective cover plate 7 is fixed above the stator base 1 and covers the middle part of the connecting platform 4, playing a protective role. Multiple stator bases 1 are spliced and connected through the positioning and tensioning mechanism 11, and multiple protective cover plates 7 are spliced and connected through the bridging fasteners 10 to achieve the modular splicing of the linear motor. The grating ruler 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 grating ruler 8 to be used for detecting the position of the connecting platform 4 in real time and feeding it back to the control system to achieve the 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 grating ruler 8 to adapt to the detection distance requirements of different brands of grating rulers 8 and reading heads 9.

[0047] Achieving the purpose or effect: realizing the modular splicing of the linear motor, which can be flexibly combined into linear motors of different lengths according to actual needs, improving the applicability and flexibility of the motor. Ensuring the structural strength and stability after splicing, enabling the spliced permanent magnet modules 2 to form a whole, improving the motor performance, and at the same time being able to adapt to the detection distance requirements of different brands of grating rulers 8 and reading heads 9.

[0048] The number of positioning and tensioning mechanisms 11 between every two adjacent stator bases 1 is two. Each positioning and tensioning mechanism 11 includes a straight pin strip 14, a toothed plate 15, a screw sleeve 16, a threaded end bolt 17, an insert block 18, and a locking bolt 19. Half of the straight pin strip 14 is a rack structure 20. A strip-shaped avoidance notch 21 for the screw sleeve 16 to move is formed in the middle of the rack structure 20. Half of the straight pin strip 14 is inserted into the profile hole 22 of one stator base 1, and the rack structure 20 is inserted into the profile hole 22 of the other stator base 1. The threaded end bolt 17 passes through the stator base 1 from outside to inside and locks one end of the straight pin strip 14 in the corresponding profile hole 22. A first threaded hole for cooperating with the threaded end bolt 17 is formed at the end of the straight pin strip 14. A positioning shaft 23 is formed at one end of the threaded bolt passing through the first threaded hole. A tensile hole 24 for the positioning shaft 23 to insert is formed on the top wall of the profile hole 22. An insert groove for the insert block 18 to be embedded is formed on the outer side of the corresponding end of the stator base 1. A central avoidance through hole 25 for the screw sleeve 16 and the locking bolt 19 to move is formed in the middle of the insert block 18. The toothed plate 15 meshes with the rack structure 20. One end of the screw sleeve 16 is axially connected to the center of the toothed plate 15. A rectangular through hole 26 for the screw sleeve 16 to rotate freely is formed at the center of the toothed plate 15. An inclined surface 27 is formed on one side of the insert block 18 away from the threaded end bolt 17. The locking bolt 19 passes through the central avoidance through hole 25 from the side of the inclined surface 27 and is screwed with the screw sleeve 16. A round gasket 28 for the locking bolt 19 to pass through and abut is attached to the inclined surface 27. The outer diameter of the round gasket 28 is larger than the groove width of the central avoidance through hole 25 and smaller than the width of the insert block 18. A strip-shaped deformation through hole 29 parallel to the inclined surface 27 is formed on the insert block 18 to provide a reaction force for the round gasket 28.

[0049] The positioning and tensioning mechanism 11 is used to connect adjacent stator bases 1. For the straight pin strip 14 in each positioning and tensioning mechanism 11, half of it is a rack structure 20, half is inserted into the profile hole 22 of one stator base 1, and the rack structure 20 is inserted into the profile hole 22 of the other stator base 1. And chamfer features are processed at both ends of the straight pin strip 14 to facilitate quick alignment and insertion into the profile hole 22. The threaded end bolt 17 passes through the stator base 1 from outside to inside and locks one end of the straight pin strip 14 in the corresponding profile hole 22. The first threaded hole at the end of the straight pin strip 14 cooperates with the threaded end bolt 17. The positioning shaft 23 at one end of the threaded bolt passing through the first threaded hole is inserted into the tensile hole 24 on the top wall of the profile hole 22, avoiding the inclination of the straight pin strip 14 due to the lack of support at the upper end of the threaded bolt after being tightened, resulting in looseness between the two stator bases 1.

[0050] The insert block 18 on the outer side of the corresponding end of the stator base 1 is fitted into the slot, and the central avoidance through hole 25 in the middle of the insert block 18 allows the screw sleeve 16 and the locking bolt 19 to move. The toothed plate 15 meshes with the rack structure 20. One end of the screw sleeve 16 is axially connected to the center of the toothed plate 15. By rotating the locking bolt 19, the locking bolt 19 passes through the round gasket 28 on the inclined surface part 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. The screw sleeve 16 pushes the toothed plate 15 to move along the rack structure 20. Due to the meshing effect between the toothed plate 15 and the rack structure 20, the two stator bases 1 are mutually tightened. The strip-shaped deformation through hole 29 parallel to the inclined surface part 27 on the insert block 18 provides a reaction force for the round gasket 28 to ensure the stability of the tightening.

[0051] Purpose or effect achieved: It realizes the tool-free and quick splicing of adjacent stator bases 1, making the two stator bases 1 always have a tendency to be mutually tightened, ensuring the connection accuracy and stability between the spliced stator bases 1, and improving the overall performance and reliability of the linear motor.

[0052] A shaft groove 30 passing through the rectangular through hole 26 is formed at the top of the toothed plate 15. A pin shaft 31 for axially connecting the tail of the screw sleeve 16 is arranged in the shaft groove 30. A PC cover plate 32 is fixedly connected and covered on the top of the toothed plate 15. A central opening 70 for avoiding the tail of the screw sleeve 16 and an avoidance opening 33 for the pin shaft 31 to leak out are formed on the PC cover plate 32. The width of the avoidance opening 33 is smaller than the shaft diameter of the pin shaft 31.

[0053] The pin shaft 31 is arranged in the shaft groove 30 at the top of the toothed plate 15, and the tail of the screw sleeve 16 is axially connected to the pin shaft 31. The PC cover plate covers the top of the toothed plate 15. The central opening 70 on it avoids the tail of the screw sleeve 16, and the avoidance opening 33 allows the pin shaft 31 to leak out, and the width of the avoidance opening 33 is smaller than the shaft diameter of the pin shaft 31. During assembly, first axially connect the tail of the screw sleeve 16 to the toothed plate 15 through the pin shaft 31, and then cover the PC cover plate. The PC cover plate fixes the pin shaft 31, making the toothed plate 15 and the screw sleeve 16 into a single part module, which is convenient for subsequent installation and use and at the same time prevents the pin shaft 31 from falling off outward.

[0054] Purpose or effect achieved: It is convenient for the assembly and use of the toothed plate 15 and the screw sleeve 16, and ensures the structural stability and reliability of the positioning and tightening mechanism 11.

[0055] A bent handle 34 capable of driving its rotation is axially connected to the tail of the locking bolt 19. A reinforcing rib 35 is formed on the inner side of the bent part of the bent handle 34. A handle card slot 36 for the bent handle 34 to enter is formed at one end of the insert block 18 away from the inclined surface part 27.

[0056] The tail of the locking bolt 19 is axially connected to the bent handle 34. There is a reinforcing rib 35 on the inner side of the bent part of the bent handle 34. A handle clamping groove 36 is formed at one end of the insert block 18 away from the inclined surface part 27. The operator rotates the bent handle 34 to drive the locking bolt 19 to rotate, thereby realizing the tensioning operation of the positioning and tensioning mechanism 11. Utilizing the elastic deformation space provided by the strip-shaped deformation through hole 29, the bent handle 34 is inserted into the handle clamping groove 36, similar to the quick-release structure of the front wheel axle of a bicycle. The reinforcing rib 35 enhances the strength of the bent handle 34, ensuring that the bent handle 34 will not be damaged during the operation process.

[0057] Achieved purpose or effect: It is convenient for the operator to operate the positioning and tensioning mechanism 11, improves the efficiency of splicing and disassembly, and at the same time ensures the reliability of the operation.

[0058] The length of the linear slide rail 5 is less than the length of the stator base 1. Second threaded holes 37 for installing rubber buffer columns are provided at both ends of the stator base 1. Each linear slide rail 5 is located between two corresponding second threaded holes 37. Two adjacent linear slide rails 5 are spliced by a short connection rail 38. Embedding mouths 39 are formed at both ends of the linear slide rail 5 and the short connection rail 38. Lower pressing plates 40 capable of entering the embedding mouths 39 of the adjacent linear slide rails 5 are formed at the tops of both ends of the short connection rail 38. Straight plate pins 41 are provided between the short connection rail 38 and the adjacent linear slide rails 5. The two halves of the straight plate pin 41 are respectively embedded in the embedding mouths 39 on both sides. The lower pressing plate 40 is attached to the top of the straight plate pin 41. Positioning through holes corresponding to the second threaded holes 37 are provided at both ends of the short connection rail 38. Extended bolts 42 for screwing downward into the second threaded holes 37 are provided in the positioning through holes.

[0059] The length of the linear slide rail 5 is less than the length 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 table 4 moves to both ends of the stator base 1. Adjacent linear slide rails 5 are spliced by a short connection rail 38. The lower pressing plates 40 at both ends of the short connection rail 38 can enter the embedding mouths 39 of the adjacent linear slide rails 5. The two halves of the straight plate pin 41 are respectively embedded in the embedding mouths 39 on both sides, and a bevel feature is processed at the lower edge of the straight plate pin 41 to facilitate smooth downward embedding into the embedding mouth 39. The lower pressing plate 40 is attached to the top of the straight plate pin 41. The positioning through holes at both ends of the short connection rail 38 correspond to the second threaded holes 37. By gradually tightening the extended bolts 42 in the positioning through holes, the lower pressing plate 40 gradually presses the straight plate pin 41 completely downward to realize the splicing of the adjacent linear slide rails 5.

[0060] Achieved purpose or effect: It ensures the accuracy and stability of the spliced linear slide rail 5, enables the connecting table 4 to slide smoothly on the linear slide rail 5, and at the same time, the setting of the rubber buffer columns extends the service life of the linear motor and reduces equipment damage.

[0061] 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 guiding bolt 45. The two guiding bolts 45 are press-fitted into both ends of the L-shaped adapter block 43 respectively. A circular hole for the adjusting bolt to pass through is formed at the center of the L-shaped adapter block 43. A third threaded hole 46 for the adjusting bolt to be screwed into and two guiding through holes 47 located on both sides of the third threaded hole 46 are arranged on the side wall of the connecting table 4. The two guiding bolts 45 are respectively inserted into the corresponding guiding through holes 47 movably. Strip-shaped sliding grooves 49 extending to the corresponding guiding through holes 47 are formed on both sides of the circular hole. The two slide bars 44 are respectively arranged in the corresponding strip-shaped sliding grooves 49. A first inclined surface 50 is formed at one end of each slide bar 44 close to the adjusting bolt, and a second inclined surface 51 is formed at the end far from the adjusting bolt. The adjusting bolt consists of a screw rod 52 and a knob part 53 fixed outside the screw rod 52. A first beveled part 54 for sliding cooperation with the first inclined surface 50 is formed at one end of the knob part 53 facing the slide bar 44. A receiving through groove 55 for accommodating the slide bar 44 is formed on the guiding bolt 45, and a second beveled part 56 for cooperating with the second inclined surface 51 is formed in the receiving through groove 55. When the adjusting bolt approaches the connecting table 4, the two slide bars 44 move away from each other, and the two guiding bolts 45 move in the direction away from the connecting table 4. A sealing plate 57 for preventing the slide bar 44 from falling off outward is fixedly arranged on the outer side of each slide bar 44. A cylindrical counterbore 48 for accommodating the knob part 53 is formed on the side wall of the connecting table 4. The third threaded hole 46 is located at the center of the bottom of the cylindrical counterbore 48.

[0062] The L-shaped adapter block of the gap adjustment mechanism is movably connected to the guiding through holes 47 on the side wall of the connecting table 4 through the guiding bolts 45 press-fitted into both ends. The adjusting bolt passes through the circular hole at the center of the L-shaped adapter block and is screwed into the third threaded hole 46 on the side wall of the connecting table 4. The slide bar 44 is arranged in the strip-shaped sliding groove 49, and a first inclined surface 50 and a second inclined surface 51 are formed at both ends respectively. The knob part 53 of the adjusting bolt has a first beveled part 54, and the guiding bolt 45 has a receiving through groove 55 for accommodating the slide bar 44 and a second beveled part 56. When the knob part 53 of the adjusting bolt is rotated to make the adjusting bolt approach the connecting table 4, the first beveled part 54 of the knob part 53 slides in cooperation with the first inclined surface 50 of the slide bar 44, causing the two slide bars 44 to move away from each other. The second inclined surface 51 of the slide bar 44 cooperates with the second beveled part 56 of the guiding bolt 45 to push the guiding bolt 45 to move in the direction away from the connecting table 4, thereby adjusting the distance between the reading head 9 and the grating scale 8. The adjustment range is 0 - 5 mm, almost covering the detection gap specifications of reading heads 9 of all brands.

[0063] Achieved purpose or effect: The detection distance between the reading head 9 and the grating scale 8 can be flexibly adjusted to adapt to the detection gap requirements of grating scales 8 and reading heads 9 of different brands, improving the versatility and applicability of the linear motor.

[0064] Both ends of the L-shaped adapter block 43 are formed with connecting ears 58. Two screw holes corresponding to the positions of the connecting ears 58 are provided on the side wall of the connecting platform 4. A smooth shaft bolt 59 is screwed into each screw hole. The smooth shaft bolt 59 passes through the corresponding connecting ear 58. A return spring 60 is sleeved on each smooth shaft bolt 59. The two ends of the return spring 60 respectively abut against the connecting ear 58 and the cap end of the smooth shaft bolt 59.

[0065] The connecting ears 58 at both ends of the L-shaped adapter block are connected to the side wall of the connecting platform 4 through smooth shaft bolts 59. A return spring 60 is sleeved on the smooth shaft bolts 59. The two ends of the spring respectively abut against the connecting ear 58 and the cap end of the smooth shaft bolt 59. When the adjusting bolt is adjusted to move the guiding bolt 45, the return spring 60 will generate elastic force. When the adjusting bolt is rotated in the reverse direction, the elastic force of the return spring 60 can reset the L-shaped adapter block and the guiding bolt 45, ensuring the stability and repeatability of the adjustment process.

[0066] Achieved purpose or effect: Ensured the adjustment accuracy and stability of the gap adjustment mechanism, making the distance adjustment between the reading head 9 and the grating scale 8 more accurate and reliable. At the same time, it facilitated the reset operation of the adjustment mechanism.

[0067] The bridging fastener 10 is composed of a rectangular bottom plate 61, a strip-shaped convex column 62 and an upper pressure plate 63. The upper pressure plate 63 and the rectangular bottom plate 61 respectively fit the protective cover plate 7 from the up and down directions. Positioning notch openings 64 that match the half shape of the strip-shaped convex column 62 are formed at both ends of the protective cover plate 7. A number of fastening holes 65 are formed on the rectangular bottom plate 61. Positioning holes 66 that cooperate with the corresponding fastening holes 65 are formed at the end of the protective cover plate 7. A beveled pouring portion 67 is milled at the upper edge of the positioning notch opening 64.

[0068] The rectangular bottom plate 61 and the upper pressure plate 63 of the bridging fastener 10 respectively fit the protective cover plate 7 from the up and down directions. The strip-shaped convex column 62 matches the positioning notch opening 64 at the end of the protective cover plate 7, and there is a beveled pouring portion 67 at the upper edge of the positioning notch opening 64, facilitating the smooth insertion of the edge of the protective cover plate 7. The fastening holes 65 on the rectangular bottom plate 61 cooperate with the positioning holes 66 at the end of the protective cover plate 7. The bridging fastener 10 is fixed to the protective cover plate 7 by bolts passing through the fastening holes 65 and the positioning holes 66, making the adjacent protective cover plates 7 stably connected.

[0069] Achieved purpose or effect: Ensured the stability after the splicing of adjacent protective cover plates 7, prevented the protective cover plate 7 from sinking, made the structural strength after connection close to that of an integral structure, and improved the protection effect of the protective cover plate 7 and the stability of the overall structure.

[0070] One side of the stator base 1 is provided with a detachable straight bar 68, the grating ruler 8 is attached to 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 bump 69 is formed at the bottom of one end of the straight bar 68, and a right-angle groove with the same shape as the bump 69 is formed at the other end. The length of the bump 69 is equal to the thickness of the end plate 3, and the bump 69 and the right-angle groove are fixedly connected by a countersunk head bolt 71.

[0071] The straight bar 68 on one side of the stator base 1 is detachable, the grating ruler 8 is attached to the outer side of the straight bar 68, a bump 69 is formed at the bottom of one end of the straight bar 68, and a right-angle groove is formed at the other end. The bump 69 and the right-angle groove are fixedly connected by a countersunk head bolt 71. During installation, the straight bar 68 is installed on one side of the stator base 1. Through the cooperation of the bump 69 and the right-angle groove and the fixation of the countersunk head bolt 71, the straight bar 68 is tightly connected to the stator base 1, ensuring the relative position accuracy between the grating ruler 8 and the stator base 1, and facilitating the installation and disassembly of the grating ruler 8.

[0072] Achieved purpose or effect: Facilitate the installation and maintenance of the grating ruler 8, while ensuring the relative position accuracy between the grating ruler 8 and the stator base 1, and improving the accuracy of the detection position of the reading head 9.

[0073] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended 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; 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 into a profile hole of one stator base, and the rack structure is inserted into 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 tail 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, 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, 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 free rotation of the screw sleeve, the side of the embedding block away from the threaded tail bolt is formed with an inclined portion, the locking bolt passes through the central avoidance through hole from one side of the inclined portion and is screwed to the screw sleeve, 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 embedding block, and 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.

2. A modular linear motor according to claim 1, 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.

3. A modular linear motor according to claim 1, 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.

4. 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.

5. 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.

6. A modular linear motor according to claim 5, 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.

7. 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.

8. 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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