Magnetic railing ruler reading head
By using integrated chips and editing lines in the magnetic scale reading head, the problems of complex design, cumbersome accuracy adjustment and insufficient signal output are solved, and the design cost is reduced, convenient accuracy editing and diverse signal output are achieved.
Patent Information
- Application Number
- CN202421662219.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The design of existing magnetic scale reading heads is complicated, resulting in high design costs; the accuracy adjustment is cumbersome, and users need to purchase base scales of multiple specifications; the signal output cannot meet the various usage needs.
It adopts an integrated chip, integrates signal sensing, subdividing and signal output functions, simplifies the reading head structure; realizes precision editing through editing lines, and supports multiple signal outputs (A, -A, B, -B); uses a pure aluminum shell to provide high-strength protection and magnetic isolation.
It reduces the cost of reading head design, simplifies the internal structure, improves the convenience of precision editing, meets a variety of signal output needs, and improves the reliability and convenience of use of products.
Smart Images
Figure CN222799916U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a magnetic grating scale reading head. Background Art
[0002] The magnetic scale is a widely used and very practical measuring tool in industrial production. During its working stage, the magnetic scale uses a magnetic sensor to detect the position of an object (that is, a sensor made using the principle of magnetic poles. The base scale is a uniformly magnetized steel belt, and the S pole and N pole are evenly spaced on the steel belt. The changes in the S and N poles are read by the reading head to count.); that is, during the use of the magnetic scale, the base scale is generally bonded to the equipment through the backing adhesive, and the reading head is limited to the upper end of the equipment. During the working stage, the equipment operates and the reading head moves in contact with the magnetic scale. During the movement, the magnet on the base scale is sensed by the chip in the reading head, and the generated electrical signal is output to the outside world from the signal output end of the reading head.
[0003] However, the existing reading heads generally involve the following problems in production and use: 1. The existing chip part is composed of several chips. After sensing weak electromagnetic signals, the chip with only sensing function will subdivide the signal through the chip with subdivision function, that is, after sensing, for example, 10 pulses, they will become 100 pulses after subdivision, and then the signal output will be executed through the function of the single-chip microcomputer. However, the above signal output method involves multiple chips, which makes the internal structure of the reading head relatively complicated, and the design cost of the reading head will also be high; 2. The accuracy range of common magnetic scales on the market is within 2μm or 5μm. The existing adjustment for the accuracy range (that is, the existing general inability to change the reading head) can only be made by adjusting the base scale The width of a single S pole and N pole is adjusted (i.e. 2μm accuracy - the width of the S pole and N pole is 2cm; 5μm accuracy - the width of the S pole and N pole is 5cm; that is, when a 2μm magnetic scale is used, the reading head moves 2cm on the base scale, that is, the accuracy of the reading head output is 2μm) to achieve the adjustment of the accuracy. As a result, if the user involves data requiring multiple accuracies during purchase, that is, at the purchase stage, it is necessary to purchase base scales of various specifications, which leads to the purchase and use of magnetic scales, which will be relatively cumbersome. 3. The signal output of most magnetic scales on the market is only A and B signals, but the current market demand requires the magnetic scale to output complementary A, -A, B, and -B signals, which leads to the signal output of most magnetic scales on the market. It cannot meet the use requirements. Summary of the invention
[0004] In view of the above-mentioned deficiencies, the utility model provides a magnetic scale reading head with a simple signal output process design and capable of reducing design costs.
[0005] In order to achieve the above purpose, the utility model adopts a magnetic scale reading head, including a shell, a circuit board and a wiring harness, the circuit board is limited in the shell, one end of the wiring harness is connected to the circuit board, and the other end extends outside the shell, and performs the reading head signal output to the outside, the shell includes a signal input side, the outer side of the signal input side corresponds to the external base scale, the circuit board is electrically connected to the inner side of the signal input side of the shell, and the chip mounting plate is provided with an integrated chip integrating signal sensing, subdivision and signal output in the direction of the inner side of the signal input side;
[0006] During the working stage of the magnetic scale, the integrated chip is used to form a reading head to perform sensing, segmentation processing and signal output to the outside world of the weak electromagnetic signal on the external base scale; the integrated chip is a 6620 electromagnetic encoding chip.
[0007] The beneficial effect of the above structure is that by integrating signal sensing, subdivision processing and signal output into one, that is, during the production stage of the magnetic scale reading head, the manufacturer can simply install the integrated chip on the corresponding chip mounting plate, thereby avoiding the existing situation in which, when designing the installation of the magnetic scale reading head, when designing the sensing, subdivision processing and output of electromagnetic signals, the corresponding chips need to be designed and installed separately, which leads to the high design cost of the magnetic scale reading head and the overly complicated design of the internal structure of the magnetic scale reading head.
[0008] The utility model is further configured such that the wiring harness includes an editing line for editing the accuracy of the reading head, one end of the editing line is connected to the circuit board, and the other end is led outside the shell, and through the editing line, the accuracy of the magnetic scale can be edited according to usage requirements.
[0009] Through the above settings, the user only needs to purchase a single S pole, N pole and a base scale with a width of 2cm during the purchase stage. After purchasing the required magnetic scale, the user can connect the editing line involved to the L port on the computer and edit the accuracy of the reading head as required. This also unifies the base scale part and the reading head part of the magnetic scale, and also allows the manufacturer to only need to carry out mass production, while the accuracy part will be edited by the user through the computer through the editing line. This also makes the magnetic scale easy to use, and during the purchase stage, it is necessary to purchase multiple base scales with different accuracy, thereby ensuring the editability of the user's purchase process and use.
[0010] The utility model is further configured that the circuit board includes a signal output chip for A, -A and B, -B signal outputs that are complementary to the magnetic scale signal output, and the wiring harness also includes an A signal output line, a -A signal output line, a B signal output line and a -B signal output line for A, -A, B and -B signal outputs, one end of the A, -A, B and -B signal output lines is connected to the circuit board, and the other end is led to the outside of the shell; the signal output chip is a 7272 chip.
[0011] Through the above arrangement, during the wiring stage of the reading head of the magnetic scale part, the user can connect the A and B signal output lines on the wiring harness according to the use needs (the -A and -B signal lines can be left unconnected or cut off), or connect all the A, B, -A and -B signal output lines, and at the same time, use the 7272 chip with complementary A, -A and B, -B signal outputs, so that the magnetic scale involved can meet the use needs of different users. In addition, for the manufacturer, during the design stage of the reading head and its circuit board, when the installation of complementary A, -A and B, -B signal outputs is required, it can be done by installing the 7272 chip, without the need to change the circuit when the output of A, -A, B- and B signals needs to be designed, similar to the existing situation, thereby further ensuring the convenience of the design of the magnetic scale reading head.
[0012] The utility model is further configured that brush installation positions are arranged on both sides of the shell body's exterior relative to the signal input side, and brushes are arranged on the brush installation positions, so that dust on the external base can be cleaned in a harsh environment through the brushes.
[0013] Through the above-mentioned design of the brush installation position, whether the brush is installed on the magnetic scale reading head can be determined according to the use environment. For example, when used in a harsh environment such as a lot of dust, the brush can be installed, while when used under normal circumstances, the brush can be not installed.
[0014] The utility model is further configured that the shell is a pure aluminum structure.
[0015] By setting the shell to a pure aluminum structure as described above, since pure aluminum has the characteristic of magnetic isolation, the internal structure of the magnetic scale reading head can be highly protected by the metal shell without affecting the transmission of electromagnetic signals, thereby further ensuring the reliability of the design.
[0016] The utility model is further configured that the circuit board also includes a power supply circuit, the chip mounting plate and the circuit board are connected through a pin header U4, the power supply circuit includes a coil L1, diodes D1-D3, resistors R1-R3, capacitors C1, C3, C5, and a pin header U2, one end of the coil L1, one end of the capacitor C5 and one end of the resistor R2 are connected to a power supply voltage VCC, one end of the diode D3, one end of the capacitor C3 and a pin 6 of the pin header U2 are connected to the other end of the coil L1, one end of the resistor R3, the other end of the capacitor C5, the other end of the diode D3 and the pin 2 of the pin header U2 are grounded, and the other end of the resistor R3 and the other end of the resistor R2 are connected to the pin 3 of the pin header U2;
[0017] One end of the diode D1, one end of the capacitor C1, one end of the diode D2 and one end of the resistor R1 are connected to pin 5 of the pin header U2, and pin 5 of the pin header U2 is connected to pin 16 of the 7272 chip U1, the other end of the resistor R1 is connected to pin 4 of the pin header U2, the other end of the diode D1 is connected to the power supply voltage VDD, and the other end of the capacitor C1 and the other end of the diode D2 are grounded together;
[0018] Pin 2 of pin header U4 is connected to power supply voltage VCC, pin 1 of pin header U4 is connected to pin 15 of 6620 electromagnetic encoding chip on chip mounting plate, pin 3 of pin header U4 is connected to pin 13 of 6620 electromagnetic encoding chip, pin 4 of pin header U4 is connected to pin 14 of 6620 electromagnetic encoding chip, pin 5 of pin header U4 is connected to power supply voltage VDD, pin 6 of pin header U4 is grounded, pin 7 of pin header U4 is connected to pin 2 of 7272 chip U1, pin 8 of pin header U4 is connected to pin 3 of 7272 chip U1, pin 9 of pin header U4 is connected to pin 10 of 7272 chip U1, pin 10 of pin header U4 is connected to pin 11 of 7272 chip U1, pins 8 and 12 of 7272 chip U1 are grounded respectively, and pins 5, 6, 7, 12, 13, 13, 14, 15 of 7272 chip U1 are connected to air respectively;
[0019] Pin 9 of the 7272 chip U1 is connected to pin 17 of the 6620 electromagnetic encoding chip U3, pin 1 of the 7272 chip U1 is connected to pin 18 of the 6620 electromagnetic encoding chip U3, pin 3 of the 6620 electromagnetic encoding chip U3 is connected to the power supply voltage VCC, pin 8 of the 6620 electromagnetic encoding chip U3 is grounded, and pins 1, 2, 4, 5, 6, 7, 9, 10, 11, 12, 16, 19, 20, 21, 22, 23, and 24 of the 6620 electromagnetic encoding chip U3 are respectively connected to air.
[0020] Through the above arrangement, the 6620 electromagnetic encoding chip involved in the magnetic scale reading head can be reliably arranged on the circuit board, and the 7272 chip integrating signal sensing, subdivision processing and signal output can also be reliably arranged accordingly on the chip mounting plate. At the same time, the chip mounting plate and the circuit board can perform convenient signal transmission through the function of the flat cable U4, thereby ensuring the reliability of the design of the magnetic scale reading head of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a three-dimensional schematic diagram of a magnetic scale reading head of a specific embodiment of the utility model;
[0022] Figure 2 It is an exploded schematic diagram of a magnetic scale reading head of a specific embodiment of the utility model;
[0023] Figure 3 This is a schematic diagram of the internal structure of the magnetic scale reading head of a specific embodiment of the utility model;
[0024] Figure 4 It is a circuit schematic diagram of a power supply circuit on a circuit board of a specific embodiment of the utility model;
[0025] Figure 5 It is a circuit schematic diagram of the 7272 chip U1 on the circuit board of the specific embodiment of the utility model;
[0026] Figure 6 It is a circuit schematic diagram of the wiring U4 of a specific embodiment of the utility model;
[0027] Figure 7 It is a circuit schematic diagram of the 6620 electromagnetic encoding chip U3 on the chip mounting plate of the specific embodiment of the utility model. DETAILED DESCRIPTION
[0028] like Figure 1-7 As shown, a specific embodiment of the utility model is a magnetic scale reading head, including a housing 1, a circuit board 3 and a wiring harness 2, the circuit board 3 is limited in the housing 1, one end of the wiring harness 2 is connected to the circuit board 3, and the other end extends outside the housing 1, and performs the reading head signal output to the outside, the housing 1 includes a signal input side a, the outer side of the signal input side a corresponds to the external base scale, the circuit board 3 is electrically connected to the inner side position of the signal input side a of the housing 1, and an integrated chip 41 integrating signal sensing, subdivision and signal output is arranged on the chip mounting plate 4 relative to the direction of the inner side of the signal input side a; the housing 1 is a pure aluminum structure;
[0029] During the working stage of the magnetic scale, the integrated chip 41 is used to form a reading head to perform sensing, segmentation processing and signal output to the outside world of the weak electromagnetic signal on the external base scale; the integrated chip 41 is a 6620 electromagnetic encoding chip.
[0030] The above-mentioned method integrates signal sensing, subdivision processing and signal output into one, that is, during the production stage of the magnetic scale reading head, the manufacturer can simply install the integrated chip on the corresponding chip mounting plate 4, thereby avoiding the existing situation in which, when designing the installation of the magnetic scale reading head, when designing the sensing, subdivision processing and output of the electromagnetic signal, the corresponding chips need to be designed and installed separately, thereby resulting in the high design cost of the magnetic scale reading head and the overly complicated design of the internal structure of the magnetic scale reading head.
[0031] like Figure 1-3 As shown, the wiring harness 2 includes an editing line for editing the accuracy of the reading head. One end of the editing line is connected to the circuit board, and the other end is led to the outside of the shell 1. Through the editing line, the accuracy of the magnetic scale can be edited according to usage requirements.
[0032] like Figure 1-7 As shown, the above-mentioned circuit board 3 includes a signal output chip 31 for A, -A and B, -B signal outputs for complementary magnetic scale signal outputs, and the wiring harness 2 also includes an A signal output line, a -A signal output line, a B signal output line and a -B signal output line for A, -A, B and -B signal outputs. One end of the A, -A, B and -B signal output lines is connected to the circuit board, and the other end is led to the outside of the housing 1; the signal output chip 31 is a 7272 chip.
[0033] Brush mounting positions are arranged on both sides of the outer shell 1 relative to the signal input side a, and brushes are installed on the brush mounting positions. The brushes can be used to clean dust on the external base in harsh environments.
[0034] like Figure 4-7 As shown, the circuit board 3 also includes a power supply circuit. The chip mounting plate 4 is connected to the circuit board through a pin header U4. The power supply circuit includes a coil L1, diodes D1-D3, resistors R1-R3, capacitors C1, C3, C5, and a pin header U2. One end of the coil L1, one end of the capacitor C5, and one end of the resistor R2 are connected to a power supply voltage VCC. One end of the diode D3, one end of the capacitor C3, and a pin 6 of the pin header U2 are connected to the other end of the coil L1. One end of the resistor R3, the other end of the capacitor C5, and the other end of the diode D3 are grounded together with a pin 2 of the pin header U2. The other end of the resistor R3 and the other end of the resistor R2 are connected to a pin 3 of the pin header U2.
[0035] One end of the diode D1, one end of the capacitor C1, one end of the diode D2 and one end of the resistor R1 are connected to pin 5 of the pin header U2, and pin 5 of the pin header U2 is connected to pin 16 of the 7272 chip U1. The other end of the resistor R1 is connected to pin 4 of the pin header U2. The other end of the diode D1 is connected to the power supply voltage VDD, and the other end of the capacitor C1 and the other end of the diode D2 are grounded together.
[0036] Pin 2 of pin header U4 is connected to power supply voltage VCC, pin 1 of pin header U4 is connected to pin 15 of 6620 electromagnetic encoding chip on chip mounting plate 4, pin 3 of pin header U4 is connected to pin 13 of 6620 electromagnetic encoding chip, pin 4 of pin header U4 is connected to pin 14 of 6620 electromagnetic encoding chip, pin 5 of pin header U4 is connected to power supply voltage VDD, pin 6 of pin header U4 is grounded, pin 7 of pin header U4 is connected to pin 2 of 7272 chip U1, pin 8 of pin header U4 is connected to pin 3 of 7272 chip U1, pin 9 of pin header U4 is connected to pin 10 of 7272 chip U1, pin 10 of pin header U4 is connected to pin 11 of 7272 chip U1, pins 8 and 12 of 7272 chip U1 are grounded respectively, and pins 5, 6, 7, 12, 13, 13, 14, and 15 of 7272 chip U1 are connected to air respectively;
[0037] Pin 9 of the 7272 chip U1 is connected to pin 17 of the 6620 electromagnetic encoding chip U3, pin 1 of the 7272 chip U1 is connected to pin 18 of the 6620 electromagnetic encoding chip U3, pin 3 of the 6620 electromagnetic encoding chip U3 is connected to the power supply voltage VCC, pin 8 of the 6620 electromagnetic encoding chip U3 is grounded, and pins 1, 2, 4, 5, 6, 7, 9, 10, 11, 12, 16, 19, 20, 21, 22, 23, and 24 of the 6620 electromagnetic encoding chip U3 are respectively connected to air.
Claims
1. A magnetic scale reading head, comprising a housing, a circuit board and a wiring harness, wherein the circuit board is confined in the housing, one end of the wiring harness is connected to the circuit board, and the other end extends outside the housing and performs the output of the reading head signal to the outside, characterized in that: The housing includes a signal input side, the outer side of the signal input side corresponds to the external base scale, the circuit board is electrically connected to a chip mounting plate at an inner side relative to the signal input side of the housing, and an integrated chip integrating signal sensing, subdivision and signal output is arranged on the chip mounting plate in a direction relative to the inner side of the signal input side; During the working stage of the magnetic scale, the integrated chip is used to form a reading head to perform sensing, segmentation processing and signal output to the outside world of the weak electromagnetic signal on the external base scale.
2. The magnetic scale reading head according to claim 1, characterized in that: The wiring harness comprises an editing line used for precision editing of the reading head. One end of the editing line is connected to the circuit board, and the other end is led outside the shell.
3. The magnetic scale reading head according to claim 1 or 2, characterized in that: The circuit board includes a signal output chip for A, -A and B, -B signal outputs that complement the magnetic scale signal outputs. The wiring harness also includes an A signal output line, a -A signal output line, a B signal output line and a -B signal output line for A, -A, B and -B signal outputs. One end of the A, -A, B and -B signal output lines is connected to the circuit board, and the other end is led outside the shell.
4. The magnetic scale reading head according to claim 1 or 2, characterized in that: Brush installation positions are arranged on both sides of the shell body outside relative to the signal input side, and brushes are installed on the brush installation positions.
5. The magnetic scale reading head according to claim 3, characterized in that: The integrated chip is a 6620 electromagnetic encoding chip, and the signal output chip is a 7272 chip.
6. The magnetic scale reading head according to claim 5, characterized in that: The shell is a pure aluminum structure.
7. The magnetic scale reading head according to claim 5, characterized in that: The circuit board also includes a power supply circuit. The chip mounting plate is connected to the circuit board through a pin header U4. The power supply circuit includes a coil L1, diodes D1-D3, resistors R1-R3, capacitors C1, C3, C5, and a pin header U2. One end of the coil L1, one end of the capacitor C5, and one end of the resistor R2 are connected to a power supply voltage VCC. One end of the diode D3, one end of the capacitor C3, and a pin 6 of the pin header U2 are connected to the other end of the coil L1. One end of the resistor R3, the other end of the capacitor C5, and the other end of the diode D3 are grounded together with a pin 2 of the pin header U2. The other end of the resistor R3 and the other end of the resistor R2 are connected to a pin 3 of the pin header U2. One end of the diode D1, one end of the capacitor C1, one end of the diode D2 and one end of the resistor R1 are connected to pin 5 of the pin header U2, and pin 5 of the pin header U2 is connected to pin 16 of the 7272 chip U1, the other end of the resistor R1 is connected to pin 4 of the pin header U2, the other end of the diode D1 is connected to the power supply voltage VDD, and the other end of the capacitor C1 and the other end of the diode D2 are grounded together; Pin 2 of pin header U4 is connected to power supply voltage VCC, pin 1 of pin header U4 is connected to pin 15 of 6620 electromagnetic encoding chip on chip mounting plate, pin 3 of pin header U4 is connected to pin 13 of 6620 electromagnetic encoding chip, pin 4 of pin header U4 is connected to pin 14 of 6620 electromagnetic encoding chip, pin 5 of pin header U4 is connected to power supply voltage VDD, pin 6 of pin header U4 is grounded, pin 7 of pin header U4 is connected to pin 2 of 7272 chip U1, pin 8 of pin header U4 is connected to pin 3 of 7272 chip U1, pin 9 of pin header U4 is connected to pin 10 of 7272 chip U1, pin 10 of pin header U4 is connected to pin 11 of 7272 chip U1, pins 8 and 12 of 7272 chip U1 are grounded respectively, and pins 5, 6, 7, 12, 13, 13, 14, 15 of 7272 chip U1 are connected to air respectively; Pin 9 of the 7272 chip U1 is connected to pin 17 of the 6620 electromagnetic encoding chip U3, pin 1 of the 7272 chip U1 is connected to pin 18 of the 6620 electromagnetic encoding chip U3, pin 3 of the 6620 electromagnetic encoding chip U3 is connected to the power supply voltage VCC, pin 8 of the 6620 electromagnetic encoding chip U3 is grounded, and pins 1, 2, 4, 5, 6, 7, 9, 10, 11, 12, 16, 19, 20, 21, 22, 23, and 24 of the 6620 electromagnetic encoding chip U3 are respectively connected to air.