Split type photoelectric angle encoder and matched tool

Abstract

The invention relates to the technical field of split type encoders, in particular to a split type photoelectric angle encoder and a matched tool, the reading head of the encoder and the end face of a grating disc are each provided with at least two positioning pin holes, and a photoelectric module in the reading head is mechanically limited through a groove; the cable is combined and fixed through the positioning ball and the wire harness binding belt, so that the use of a structural adhesive in the production process is reduced, the production cost is reduced, and the production efficiency and the maintainability and interchangeability of the product are improved. In the debugging process before leaving the field, the positions of the reading head and the grating disc are relatively fixed by using a matched tool, so that the problem that the positions of the reading head and the grating disc need to be subjected to secondary adjustment during use by a customer is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of split encoders, and in particular relates to a split photoelectric angle encoder and a matching tooling. Background Art

[0002] Photoelectric encoders, as sensors that convert mechanical geometric displacement into pulses or digital quantities, are mainly divided into two types according to their structural form: integral and split. The integral photoelectric encoder has an independent shaft system and bearings, and can be used alone without relying on the support of the product shaft system, which makes its system complete and the installation and adjustment work less repetitive. However, the disadvantage of the integral photoelectric encoder is that it is large in size and is not suitable for applications with limited space. The split photoelectric encoder has no bearings inside, has a simple structure, and is small in size, but its function needs to rely on the product shaft system, resulting in a lot of repetitive and difficult installation and adjustment work.

[0003] The installation process of traditional split encoders is relatively complicated. During installation, special positioning tooling is required to achieve precise positioning of the encoder reading head and the grating code disk. The internal structure of the reading head relies on structural adhesive bonding, which has high production costs, poor product maintainability and interchangeability, and bonding relies on manual adjustment. The assembly standard consistency is poor and the qualified rate is low, especially the cable part of the reading head, which relies on bonding for fixation, and the cable fixation is unreliable. The above problems greatly limit the reliability of split encoders and the performance of the device in high-precision applications.

[0004] In addition, when using the split encoder, there are extremely high requirements for the relative position of the reading head and the grating disk. After the traditional split encoder is debugged before leaving the factory, the reading head and the grating disk of the split encoder are two independent components with no connection at all, so the reading head and the grating disk are usually transported to the customer's factory in a separated form. When the customer uses it, the reading head and the grating disk need to be installed to the work station first, and the installation position of the reading head and the grating disk needs to be adjusted twice. Sometimes, the encoder manufacturer even needs to send professional technicians to the customer's factory for adjustment. The adjustment process is time-consuming and labor-intensive, and the customer's adjustment accuracy is difficult to achieve the accuracy of the pre-factory debugging. Therefore, the split encoder output signal quality is poor. Summary of the invention

[0005] In view of this, the present invention aims to provide a split photoelectric angle encoder and supporting tooling, which adopts the method of positioning ball extrusion to fix the cable, and the photoelectric module adopts grooves for mechanical limiting, thereby avoiding the problem that the internal components of the reading head are difficult to disassemble due to the traditional bonding process. A supporting tooling is also proposed, which realizes precise positioning before delivery through the positioning module and the positioning pins, and maintains the positional relationship between the reading head and the grating disk through the positioning module and the positioning pins, thereby solving the problem of needing to perform secondary debugging of the reading head and the grating disk when installing them to the work station.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows: The invention provides a split photoelectric angle encoder, comprising: a reading head and a grating disk, wherein at least two positioning pin holes are provided on the end surfaces of the reading head and the grating disk; The reading head comprises: a shell, a photoelectric module, a cable, a positioning ball and a concave-end top screw, wherein a groove matching the photoelectric module is opened in the shell, and the photoelectric module is installed in the groove to realize mechanical positioning; a through hole is opened on the shell for inserting the cable, and at least one radial screw hole is opened on the side wall of the through hole; a positioning ball is installed in each radial screw hole, and a concave-end top screw is engaged with the thread, and the front end of the concave-end top screw abuts against the positioning ball, and the abutment positioning or disassembly of the positioning ball and the cable is realized by twisting the concave-end top screw.

[0007] Preferably, the reading head further comprises: a cover plate connected to the opening surface of the shell by screws.

[0008] Preferably, the optoelectronic module and the cable are connected in a socket and plug manner.

[0009] Preferably, the reading head also includes a wire tie, which is fixed in the shell, and the wire tie is used to connect the cables and pre-fix the cables.

[0010] Preferably, a window is opened on the cover plate, the position of the window corresponds to the photoelectric module, and the indicator light of the photoelectric module can be observed through the window.

[0011] Preferably, the positioning pin holes on the grating disk are evenly distributed on the annular end surface of the grating disk.

[0012] Another aspect of the invention provides a matching tooling for a split photoelectric angle encoder, comprising: a positioning module and a positioning pin, wherein the positioning module is provided with: a positioning hole matched with the positioning pin hole of the reading head, and a positioning hole matched with the positioning pin hole of the grating disk; The positioning pin passes through the positioning pin hole and the positioning hole to form a detachable positioning connection between the reading head and the positioning module, and a detachable positioning connection between the grating disk and the positioning module; When installing the encoder at the work station, the positioning pin is used to pass through the positioning pin hole and the positioning hole to form a detachable positioning connection between the reading head and the positioning module, as well as a detachable positioning connection between the grating disk and the positioning module, thereby realizing the positioning installation of the reading head and the grating disk.

[0013] Preferably, the positioning module comprises a ring piece, a positioning cylinder and an ear piece, the ear piece is connected to the edge of the ring piece, and the ear piece and the ring piece are coplanar, and the positioning holes matched with the positioning pin holes of the reading head are distributed on the ear piece; The bottom surface of the positioning cylinder is concentrically connected to the ring piece. The outer diameter of the positioning cylinder is equal to the inner diameter of the grating disk. The positioning cylinder penetrates into the inner diameter of the grating disk to realize the pre-positioning of the positioning module and the grating disk. The positioning holes matched with the positioning pin holes of the grating disk are distributed on the ring piece.

[0014] Preferably, the positioning module is an "I"-shaped structure, and the positioning holes matched with the positioning pin holes of the reading head are distributed at both ends of the upper cross bar of the "I"-shaped structure, and the positioning holes matched with the positioning pin holes of the grating disk are distributed at both ends of the lower cross bar of the "I"-shaped structure.

[0015] Compared with the prior art, the invention can achieve the following beneficial effects:

[0016] The photoelectric module of the encoder proposed in the present invention uses grooves for mechanical limiting, which avoids the problem that the internal components of the reading head are difficult to disassemble, replace and repair due to the traditional bonding process, and also reduces the use of structural adhesives in the production process, greatly shortens the process time caused by colloid curing, reduces production costs, and improves production efficiency. At the same time, the mechanical positioning installation method improves the maintainability and interchangeability of the product.

[0017] The cable of the encoder proposed in the present invention adopts a combined fixing method of wire harness binding and positioning ball extrusion, thereby realizing the combined axial and radial fixation of the cable. The positioning ball extrusion method can effectively prevent the insulating protective sheath of the outer layer of the cable from being subjected to large local stress, thereby avoiding damage to the insulating protective sheath. Moreover, without damaging the outer protective sheath on the cable surface, the fixed cable can withstand a tensile force of 100 Newtons, thereby greatly improving the stability of the cable.

[0018] The encoder proposed in the present invention is provided with positioning pin holes on the reading head and the grating disk, and a matching tooling is designed. During the debugging process before delivery, the positioning module and the positioning pins are used to relatively fix the positions of the reading head and the grating disk, so as to achieve accurate positioning of the encoder reading head and the grating disk. When the customer uses and installs it, the positional relationship between the reading head and the grating disk is maintained by the positioning module and the positioning pins, so as to avoid the customer from performing secondary adjustment of the positions of the reading head and the grating disk, reduce the difficulty of debugging the equipment for the production staff, improve the installation efficiency, and avoid the low installation accuracy caused by improper human operation, which affects the quality of the reading signal. In addition, after the installation of the reading head and the grating disk is completed, the matching tooling can be removed, and the matching tooling can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 is a structural diagram of a split-type photoelectric angle encoder provided according to an embodiment of the present invention; Figure 2 is an exploded view of a reading head provided according to an embodiment of the present invention; Figure 3 is a structural diagram of a reading head housing provided according to an embodiment of the present invention; Figure 4 is a structural diagram of a first type of matching tooling provided according to an embodiment of the present invention; Figure 5 It is a structural diagram of a second supporting tooling provided according to an embodiment of the present invention.

[0020] Reference numerals include: Reading head 1, grating disk 2, positioning module 3, positioning pin hole 4, positioning hole 5; Shell 11, cover plate 12, photoelectric module 13, cable 14, positioning ball 15, concave end top screw 16, wire harness tie 17; Ring piece 31, positioning cylinder 32, ear piece 33; An upper crossbar 34 and a lower crossbar 35; Positioning block 111 , positioning surface 112 , positioning protrusion 113 . DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and do not constitute a limitation to the invention. Similar components in different embodiments use associated similar component numbers. In the following embodiments, many detailed descriptions are to enable the invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other components, materials, and methods. In some cases, some operations related to the invention are not shown or described in the specification, in order to avoid the core part of the invention being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0023] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0024] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] See also Figure 1 In one embodiment of the present invention, a split photoelectric angle encoder is provided, which mainly includes a reading head 1 and a grating disk 2. The reading head 1 and the grating disk 2 are two-part core components of a split type, wherein the reading head 1 integrates a photoelectric sensing function and a signal processing circuit for obtaining the rotation angle information of the grating disk 2. The grating disk 2 carries an annular code disk with a specific coding structure, and the grating disk 2 is a metal reflective code disk with reading lines engraved thereon. During use, the grating disk 2 is usually installed on the output shaft of the motor and rotates with the motor. The reading head 1 is installed on a non-rotating part to record the photoelectric signal generated by the rotation of the grating disk 2 to achieve coding counting.

[0027] See also Figure 2 The reading head 1 mainly includes a shell 11, a cover plate 12, a photoelectric module 13, and a cable 14, wherein the internal components of a conventional reading head are all bonded, and a large amount of structural adhesives are required during the production process, and the curing time of the structural adhesives will affect the production efficiency of the reading head 1. Therefore, the embodiment of the present invention adopts a mechanical limit installation, by opening a groove in the shell 11, and mechanically limiting the photoelectric module 13 through the groove. In addition, in order to ensure the reliability of the installation of the cable 14, a positioning ball 15, a concave end top screw 16, and a wire harness tie 17 are added to realize the axial and radial combined fixation of the cable 14. For details, please refer to Figure 3The inside of the housing 11 is processed according to the size, shape and opening position of the photoelectric module 13, and a groove is designed to be formed, and a positioning block 111, a positioning surface 112 and a positioning protrusion 113 are formed inside the groove, wherein the positioning block 111 is designed according to the shape of the photoelectric module 13 to ensure that the photoelectric module 13 can be accurately installed in the housing 11; the positioning surface 112 is used to support the photoelectric module 13; the design of the positioning protrusion 113 avoids the problem of reverse installation of the photoelectric module 13, has an assembly foolproof effect, and reduces manual operation errors. The cover plate 12 is installed on the opening surface of the housing 11 with screws. In addition, it should be noted that a window is provided on the cover plate 12, and the window can be a transparent plate or a through hole can be directly opened on the cover plate 12. The design position of the window corresponds to the indicator light on the photoelectric module 13. The indicator light on the photoelectric module 13 can be observed through the window. By observing the light language, the encoder fault can be eliminated, the equipment efficiency can be improved, and the accuracy of the angle encoder system can be guaranteed.

[0028] See also Figure 2 A through hole for inserting the cable 14 is opened on the shell 11. The diameter of the through hole is slightly larger than the diameter of the cable 14, and the through hole is connected to the groove for installing the optoelectronic module 13. The optoelectronic module 13 and the cable 14 can be connected through the through hole. The electrical module 13 and the cable 14 are connected by a socket plug. In order to ensure the installation stability of the cable 14, a wire harness tie 17 is fixed in the shell 11. The wire harness tie 17 can bundle and pre-fix the cable 14 to prevent the cable 14 from moving axially along the through hole. In addition, at least one radial screw hole is vertically opened on the side wall of the through hole, and each radial screw hole is connected to the through hole. After the optoelectronic module 13 and the cable 14 are connected, a positioning ball 15 is installed in each radial screw hole. The positioning ball 15 is a stainless steel bead. A threaded concave top screw 16 is screwed into the radial screw hole, and the front end of the concave top screw 16 abuts against the positioning ball 15. The positioning ball 15 and the cable 14 are abutted and positioned by twisting the concave top screw 16 to prevent the cable 14 from rotating radially. When disassembly and maintenance are required, the concave top screw 16 can be unscrewed to achieve disassembly. The reading head 1 designed in the embodiment of the present invention adopts mechanical positioning installation, avoiding the traditional bonding process, and can repair and replace components without damaging the core components, greatly improving the maintainability and parts interchangeability of the product. In addition, the embodiment of the present invention adopts the design of the abutment of the positioning ball 15 to improve the installation reliability of the cable 14. According to tests, the cable 14 can withstand a tensile force of 100 Newtons (N) without damaging the insulating outer protective skin on the surface of the cable 14.

[0029] Also, see Figure 1In order to facilitate accurate positioning of the reading head 1 and the grating disk 2 during debugging, testing and use, at least two positioning pin holes 4 are provided on the end faces of the reading head 1 and the grating disk 2. The positioning pin holes 4 on the reading head 1 are provided on the end face of the positioning block 111. The positioning pin holes 4 on the grating disk 2 are evenly distributed on the annular end face of the grating disk 2, that is, the positioning pin holes 4 on the grating disk 2 are distributed on each vertex of the inscribed regular polygon of the grating disk 2.

[0030] Based on the above split photoelectric angle encoder, the embodiment of the present invention also provides its supporting tooling, please refer to Figure 4 The first type of split photoelectric angle encoder supporting tooling includes: a positioning module 3 and a positioning pin, the positioning module 3 includes a ring piece 31, a positioning cylinder 32 and an ear piece 33, wherein the ear piece 33 is connected to the edge of the ring piece 31, and the ear piece 33 is connected to the ring piece 31 in the same plane, the ear piece 33 and the ring piece 31 are usually made in one piece, and a positioning hole 5 is respectively provided at the left and right ends of the ear piece 33, and the two positioning holes 5 are respectively made to correspond to the two positioning pin holes 4 on the housing 11 of the reading head 1, and the positioning pin passes through the positioning pin hole 4 and the positioning hole 5 in sequence, so that the reading head 1 and the positioning module 3 can be detachably positioned and connected, and the relative position of the reading head 1 and the positioning module 3 can be fixed. The positioning cylinder 32 is arranged perpendicular to the ring piece 31, the bottom surface of the positioning cylinder 32 is concentrically connected to the ring piece 31, and the bottom surface diameter of the positioning cylinder 32 is equal to the inner ring diameter of the ring piece 31, and the outer diameter of the positioning cylinder 32 is equal to or slightly smaller than the inner diameter of the grating disk 2. Two positioning holes 5 are arranged on the end surface of the ring plate 31, and the two positioning holes 5 are respectively matched with the two positioning pin holes 4 on the grating disk 2. During the debugging process before delivery, the positioning cylinder 32 is inserted into the inner diameter of the grating disk 2 to realize the pre-positioning of the positioning module 3 and the grating disk 2, and the grating disk 2 is rotated so that the positioning pin holes 4 on the grating disk 2 are aligned with the positioning holes 5 on the ring plate 31. By passing the positioning pin through the positioning pin hole 4 and the positioning hole 5 in turn, the grating disk 2 and the positioning module 3 can be detachably positioned and connected, and the relative position of the grating disk 2 and the positioning module 3 can be fixed, thereby realizing the precise positioning of the reading head 1 and the grating disk 2.

[0031] Before leaving the factory, the reading head 1 and grating disk 2 of the split photoelectric angle encoder are accurately positioned by matching tooling and transported to the customer's factory. The customer can directly fix the grating disk 2 on the motor output shaft and fix the reading head 1. When the reading head 1 and grating disk 2 are installed, the positioning pin and positioning module 3 can be removed to start the encoder. Before the split photoelectric angle encoder is installed in the customer's factory, the position is constrained by the positioning pin and positioning module 3, which can effectively avoid the customer's secondary adjustment during the installation process, saving time and effort, and the installation accuracy is high, which solves the problem of the traditional split encoder requiring the reading head 1 and grating disk 2 to be re-positioned and debugged when the customer uses it.

[0032] As a possible example, see Figure 5 A second split photoelectric angle encoder supporting tooling is also provided, which also includes a positioning module 3 and a positioning pin, and Figure 4 The difference between the matching tooling shown is that the structure and shape of the positioning module 3 are slightly different. The positioning module 3 adopts an "I"-shaped structure. A positioning hole 5 is respectively provided at both ends of the upper crossbar 34 of the "I"-shaped structure. The two positioning holes 5 are respectively matched with the positioning pin holes 4 on the housing 11 of the reading head 1. By passing the positioning pin through the positioning pin hole 4 and the positioning hole 5 in sequence, the detachable positioning connection between the reading head 1 and the positioning module 3 can be achieved, and the relative position of the reading head 1 and the positioning module 3 can be fixed. A positioning hole 5 is respectively provided at both ends of the lower crossbar 35 of the "I"-shaped structure. The two positioning holes 5 are respectively matched with the two positioning pin holes 4 on the grating disk 2. By passing the positioning pin through the positioning pin hole 4 and the positioning hole 5 in sequence, the detachable positioning connection between the grating disk 2 and the positioning module 3 can be achieved, and the relative position of the grating disk 2 and the positioning module 3 can be fixed, thereby achieving precise positioning of the reading head 1 and the grating disk 2. This matching tooling does not have a pre-positioning design for the positioning module 3 and the grating disk 2. Before factory debugging, the debugging process is not as convenient as the first matching tooling, but the structure is simpler, and during use in the customer's factory, the effects of the two toolings are exactly the same.

[0033] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0034] The systems, devices, modules or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0035] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0036] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0037] The above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A split photoelectric angle encoder, characterized in that: include: A reading head and a grating disk, each of the reading head and the grating disk having at least two positioning pin holes on its end surface; The reading head comprises: a shell, a photoelectric module, a cable, a positioning ball and a concave-end top screw, wherein a groove matching the photoelectric module is opened in the shell, and the photoelectric module is installed in the groove to realize mechanical positioning; a through hole is opened on the shell for inserting the cable, and at least one radial screw hole is opened on the side wall of the through hole; a positioning ball is installed in each radial screw hole, and a concave-end top screw is engaged with the thread, and the front end of the concave-end top screw abuts against the positioning ball, and the abutment positioning or disassembly of the positioning ball and the cable is realized by twisting the concave-end top screw.

2. The split photoelectric angle encoder according to claim 1, characterized in that: The reading head also includes: a cover plate connected to the opening surface of the shell through screws.

3. The split type photoelectric angle encoder according to claim 1, characterized in that: The optoelectronic module and the cable are connected by means of a socket and a plug.

4. The split type photoelectric angle encoder according to claim 1, characterized in that: The reading head also includes a wire harness tie, which is fixed in the shell and is used to connect the cables and pre-fix the cables.

5. The split type photoelectric angle encoder according to claim 5, characterized in that: A window is opened on the cover plate, the position of the window corresponds to the photoelectric module, and the indicator light of the photoelectric module can be observed through the window.

6. The split type photoelectric angle encoder according to claim 1, characterized in that: The positioning pin holes on the grating disk are evenly distributed on the annular end surface of the grating disk.

7. A matching tooling for the split-type photoelectric angle encoder according to any one of claims 1 to 6, characterized in that: include: A positioning module and a positioning pin, wherein the positioning module is provided with: a positioning hole matched with the positioning pin hole of the reading head, and a positioning hole matched with the positioning pin hole of the grating disk; The positioning pin passes through the positioning pin hole and the positioning hole to form a detachable positioning connection between the reading head and the positioning module, and a detachable positioning connection between the grating disk and the positioning module; When installing the encoder, the positioning pin is used to pass through the positioning pin hole and the positioning hole to form a detachable positioning connection between the reading head and the positioning module, and a detachable positioning connection between the grating disk and the positioning module, thereby realizing the positioning installation of the reading head and the grating disk.

8. The split type photoelectric angle encoder according to claim 7, characterized in that: The positioning module includes a ring piece, a positioning cylinder and an ear piece, the ear piece is connected to the edge of the ring piece, and the ear piece and the ring piece are in the same plane, and the positioning holes matched with the positioning pin holes of the reading head are distributed on the ear piece; The bottom surface of the positioning cylinder is concentrically connected to the ring sheet, the outer diameter of the positioning cylinder is equal to the inner diameter of the grating disk, and the positioning cylinder penetrates into the inner diameter of the grating disk to realize the pre-positioning of the positioning module and the grating disk, and the positioning holes matched with the positioning pin holes of the grating disk are distributed on the ring sheet.

9. The split type photoelectric angle encoder according to claim 7, characterized in that: The positioning module is an "I"-shaped structure, and the positioning holes matched with the positioning pin holes of the reading head are distributed at both ends of the upper crossbar of the "I"-shaped structure, and the positioning holes matched with the positioning pin holes of the grating disk are distributed at both ends of the lower crossbar of the "I"-shaped structure.

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