Hall position sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a Hall position sensor which comprises a sensor shell, a shielding cover, a circuit board, a sensor cover body and a rotor assembly, and a plurality of connecting terminals are fixed in the sensor shell; the shielding cover is mounted in the sensor shell, and a hollow hole is formed in the shielding cover; the circuit board is mounted in the shielding case, a plurality of crimping holes are formed in the circuit board, and the connecting terminals are in interference fit with the crimping holes through crimping after penetrating through the hollow holes; the sensor cover body is connected with the sensor shell in a buckling manner, and a sealing piece is arranged between the sensor cover body and the sensor shell; the rotor assembly comprises a rotor body, a rotor seat, a magnet and a rotor end cover, a first end of the rotor body is provided with a magnet groove, and the magnet is fixed in the magnet groove; and the second end of the rotor body penetrates out of the rotor seat and the rotor end cover. According to the utility model, the anti-electromagnetic interference capability of the Hall position sensor is improved, the problem that the welding spots of the connecting terminals are easy to crack is avoided, the structure is compact, and the size is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a Hall position sensor. Background Art

[0002] As one of the signals collected by automotive electronic control systems, automotive position sensors are a key component of these systems. They are widely used in systems such as position detection and acceleration modules (electronic accelerator pedals). The basic principle of Hall-effect position sensors is that when a magnet and a Hall element undergo relative displacement, the Hall element detects the change in magnetic field strength. This change is converted into a voltage signal by internal circuitry and output to the vehicle's ECU or VCU, thereby controlling vehicle speed.

[0003] Existing Hall effect position sensors have the following problems: the sensor's connection terminals are usually connected by welding, which can easily cause the solder joints to crack when encountering vibration conditions, affecting the normal use of the sensor; the sensor has poor magnetic isolation and suffers from electromagnetic interference, which affects the sensor's output effect; and the internal structure layout of existing sensors is not compact enough, resulting in the sensor being too large and unable to meet the needs of miniaturized applications.

[0004] Therefore, a Hall position sensor is urgently needed to solve the above technical problems. Utility Model Content

[0005] Based on the above, the purpose of the present invention is to provide a Hall position sensor to solve the problems of Hall position sensors in related technologies such as easy cracking of solder joints, poor electromagnetic interference resistance, and large size.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A Hall position sensor, comprising:

[0008] A sensor housing, wherein a first accommodating cavity is provided on one side of the sensor housing, and a plurality of connecting terminals are fixed in the first accommodating cavity;

[0009] A shielding cover is installed in the first accommodating cavity, and a hollow hole is opened on the shielding cover for the connecting terminal to pass through;

[0010] A circuit board is installed in the shielding case, and a plurality of crimping holes are provided on the circuit board. After each of the connecting terminals passes through the hollow holes, they are press-fitted with the crimping holes through interference fit; a Hall element is provided on the circuit board;

[0011] The sensor cover is fixed to the sensor housing by a snap connection, and a seal is provided between the sensor cover and the sensor housing; a second accommodating cavity is provided on a side of the sensor cover facing away from the sensor housing;

[0012] The rotor assembly includes a rotor body, a rotor seat, a magnet and a rotor end cover. The first end of the rotor body is rotatably mounted in the second accommodating cavity. The first end of the rotor body is provided with a magnet slot, and the magnet is fixed in the magnet slot; the second end of the rotor body is rotatably mounted on the rotor seat, and the rotor seat is fixed to the sensor cover by a snap connection; the rotor end cover is fixed to the side of the rotor seat away from the sensor cover by a snap connection, and the second end of the rotor body passes through the rotor end cover.

[0013] In some possible implementations, the sealing member is a rubber sealing ring.

[0014] In some possible implementations, the connecting terminals are arranged along an arc-shaped trajectory in the first accommodating cavity, and the hollow holes on the shielding cover are arranged in an arc shape.

[0015] In some possible embodiments, the number of the connecting terminals is six; the shielding cover is provided with three hollow holes, namely a first hollow hole, a second hollow hole and a third hollow hole, and the second hollow hole and the third hollow hole are respectively located at both ends of the first hollow hole; among the six connecting terminals, the four connecting terminals located in the middle pass through the first hollow hole, and the two connecting terminals located on both sides pass through the second hollow hole and the third hollow hole respectively.

[0016] In some possible implementations, each of the connecting terminals is fixed in the sensor housing by being pre-embedded.

[0017] In some possible implementations, the connection terminal has a fisheye shape.

[0018] In some possible implementations, the magnet is polygonal in shape, the magnet slot matches the shape of the magnet, and the magnet is interference fitted in the magnet slot.

[0019] In some possible implementations, the rotor end cover is made of soft plastic or rubber to facilitate snap-fit ​​connection with the rotor base.

[0020] In some possible embodiments, the sensor cover is circumferentially provided with a plurality of first clips, and the sensor housing is circumferentially provided with a plurality of first slots on a side facing the sensor cover, and the first clips are connected to the first slots in a one-to-one corresponding manner.

[0021] In some possible implementations, the rotor seat is circumferentially provided with a plurality of second clips, and the sensor cover is circumferentially provided with a plurality of second slots on a side facing the rotor seat, and the second clips are connected to the second slots in a one-to-one corresponding manner.

[0022] In some possible embodiments, the assembly consisting of the sensor housing, the shielding cover, the circuit board, the seal and the sensor cover can be used independently of the rotor assembly, and the assembly consisting of the sensor housing, the shielding cover, the circuit board, the seal and the sensor cover can be installed on other components as an element for outputting voltage signals.

[0023] Beneficial effects of the utility model:

[0024] The Hall position sensor provided by the utility model can effectively isolate the electromagnetic interference of the external environment on the internal components of the sensor by providing a shielding cover and installing the circuit board in the shielding cover, thereby improving the sensor's anti-electromagnetic interference ability and further improving the accuracy of the sensor's output voltage; at the same time, a hollow hole is provided on the shielding cover, and a crimping hole is provided on the circuit board. After each connecting terminal passes through the hollow hole, it is interference-fitted with the corresponding crimping hole on the circuit board by crimping. The connection is reliable, the assembly is simple, the operation is convenient, and it can be better applied to vibration working conditions, avoiding the problem that the solder joints are easily cracked when the connecting terminals are connected by welding; and the first end of the rotor body is provided with a The magnet slot is fixed in the magnet slot. When the rotor body rotates, the magnet can rotate with the rotor body. This arrangement has a compact structure and is firmly fixed, which simplifies the design of the transmission mechanism, helps save space, and reduces the volume of the sensor. In addition, the sensor cover and the sensor housing are connected by a snap buckle, and the rotor seat and the sensor cover are connected by a snap buckle, which facilitates the disassembly and maintenance of the sensor. A seal is set between the sensor cover and the sensor housing to achieve good sealing, effectively preventing dust, oil, water vapor, etc. from entering the sensor and causing corrosion or pollution to the circuit board, thereby improving the applicable environmental range of the sensor and extending the service life of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an exploded view of a Hall position sensor provided by an embodiment of the present utility model;

[0026] Figure 2 It is a structural schematic diagram of the sensor housing involved in an embodiment of the present utility model;

[0027] Figure 3 It is a partial cross-sectional view of the sensor housing involved in the embodiment of the present utility model;

[0028] Figure 4 It is a schematic structural diagram of a shielding cover according to an embodiment of the present utility model;

[0029] Figure 5 This is a schematic structural diagram of a circuit board according to an embodiment of the present utility model;

[0030] Figure 6 This is a schematic structural diagram of a sensor cover and a sealing ring according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic structural diagram of a sensor cover according to an embodiment of the present invention;

[0032] Figure 8 It is a structural schematic diagram of a rotor assembly involved in an embodiment of the present utility model.

[0033] In the picture:

[0034] 1. Sensor housing; 101. First accommodating cavity; 102. Connecting terminal; 103. First card slot; 2. Shielding cover; 201. Hollow hole; 3. Circuit board; 301. Crimp hole; 4. Seal; 5. Sensor cover; 501. First buckle; 502. Second card slot; 503. Second accommodating cavity; 6. Magnet; 7. Rotor body; 701. Magnet slot; 8. Rotor seat; 801. First through hole; 802. Second buckle; 9. Rotor end cover; 901. Second through hole. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this utility model, the terms "upper," "lower," "left," and "right," etc., regarding orientations or positions, are based on the orientations or positions shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] like Figures 1 to 8As shown, this embodiment provides a Hall effect position sensor comprising a sensor housing 1, a shielding cover 2, a circuit board 3, a sensor cover 5, and a rotor assembly. The sensor housing 1 is the main mounting structure of the Hall effect position sensor. A first accommodating cavity 101 is provided on one side of the sensor housing. Several connecting terminals 102 are fixed within the first accommodating cavity 101, each of which is used to connect to an external circuit. The shielding cover 2 is mounted within the first accommodating cavity 101. The shielding cover 2 comprises a base plate and an annular side plate. The base plate is provided with a hollow hole 201 through which each connecting terminal 102 passes. The circuit board 3 is mounted within the shielding cover 2, shielding it from external electromagnetic interference. The circuit board 3 integrates a Hall effect element and electronic components, with the Hall effect element located on the side of the circuit board 3 closest to the sensor cover 5. The circuit board 3 is provided with several crimping holes 301. After each connecting terminal 102 passes through the hollow hole 201, it is crimped into the corresponding crimping hole 301 to achieve an interference fit, thereby physically and electrically connecting the connecting terminal 102 to the circuit board 3. The sensor cover 5 is secured to the sensor housing 1 via a snap-fit ​​connection, enclosing the shield 2 and circuit board 3 within the first accommodating cavity 101. A second accommodating cavity 503 is provided on the side of the sensor cover 5 facing away from the sensor housing 1 for mounting the rotor assembly. The rotor assembly comprises a rotor body 7, a rotor base 8, a magnet 6, and a rotor end cap 9. The rotor body 7 is shaped like a stepped shaft, with the end closest to the sensor cover 5 as the first end and the end further away from the sensor cover 5 as the second end. The outer diameter of the first end is larger than that of the second end. The first end of the rotor body 7 is rotatably mounted within the second accommodating cavity 503. A magnet slot 701 is provided on the end surface of the first end of the rotor body 7. The magnet 6 is secured within the magnet slot 701, and the position of the magnet 6 corresponds to the Hall element on the circuit board 3. The second end of the rotor body 7 is rotatably mounted within the rotor base 8, which is secured to the sensor cover 5 via a snap-fit ​​connection. The rotor end cap 9 is also secured to the side of the rotor base 8 facing away from the sensor cover 5 via a snap-fit ​​connection. In this embodiment, a first through hole 801 is formed on the rotor seat 8, a second through hole 901 is formed on the rotor end cover 9, and the second end of the rotor body 7 passes through the first through hole 801 and the second through hole 901 in sequence to connect with the external component to be detected.

[0040] When the Hall position sensor of this embodiment is in use, the rotor body 7 rotates, driving the magnet 6 fixed to one end of the rotor body 7 to rotate. When the magnet 6 rotates, its magnetic field changes. The Hall element senses the change in magnetic field strength and outputs a Hall voltage to the circuit board 3. The circuit board 3 outputs voltage signals of different sizes according to the changes in the received magnetic field signal, and transmits the voltage signal to the external circuit through the connection terminal 102 and the wiring harness to provide a voltage signal that meets the requirements.

[0041] The Hall position sensor provided in this embodiment can effectively isolate the electromagnetic interference of the external environment on the internal components of the sensor by providing a shielding cover 2 and installing the circuit board 3 in the shielding cover 2, thereby improving the sensor's anti-electromagnetic interference capability and further improving the accuracy of the sensor's output voltage; at the same time, a hollow hole 201 is provided on the shielding cover 2, and a crimping hole 301 is provided on the circuit board 3. After each connecting terminal 102 passes through the hollow hole 201, it is interference-fitted with the corresponding crimping hole 301 on the circuit board 3 by crimping. The connection is reliable, the assembly is simple, the operation is convenient, and it can be better applied In vibration working conditions, the problem of easy cracking of the solder joint when the connecting terminal 102 is connected by welding is avoided; moreover, a magnet groove 701 is provided at the first end of the rotor body 7, and the magnet 6 is fixed in the magnet groove 701. When the rotor body 7 rotates, the magnet 6 can rotate with the rotor body 7. Such an arrangement has a compact structure and is firmly fixed, simplifies the design of the transmission mechanism, is conducive to saving space, and reduces the volume of the sensor; in addition, the sensor cover 5 is connected to the sensor housing 1 by a snap buckle, and the rotor base 8 is connected to the sensor cover 5 by a snap buckle, which facilitates the disassembly and maintenance of the sensor.

[0042] In the prior art, the Hall position sensor still has the problem of poor sealing and poor waterproof and dustproof ability. To solve this problem, a seal 4 is provided between the sensor cover 5 and the sensor housing 1 of the present embodiment. The seal 4 achieves a good seal between the sensor cover 5 and the sensor housing 1, effectively preventing dust, oil, water vapor, etc. from entering the interior of the sensor and causing corrosion or pollution to the circuit board 3, thereby improving the applicable environmental range of the sensor and extending the service life of the sensor. Optionally, the seal 4 of the present embodiment is a rubber sealing ring, which has a simple structure, is easy to manufacture and install, has good sealing performance, and has a long service life. Specifically, in the present embodiment, a boss is provided on the side of the sensor cover 5 facing the sensor housing 1, and the rubber sealing ring is tightly fitted on the boss.

[0043] Optionally, in this embodiment, each connecting terminal 102 is arranged along an arc-shaped trajectory in the first accommodating cavity 101, and the hollow holes 201 on the shielding cover 2 are also arranged in an arc shape, and the position of the hollow holes 201 corresponds to the position of the connecting terminals 102. The arc-shaped arrangement is structurally reasonable and compact, which reduces the space occupied by the connecting terminals 102 as a whole, is conducive to reducing the volume of the sensor, and adapts to the design requirements of miniaturization. It should be noted that in this embodiment, the number of hollow holes 201 on the shielding cover 2 can be the same as the number of connecting terminals 102, and the two are arranged in a one-to-one correspondence; or the number of hollow holes 201 on the shielding cover 2 can also be less than the number of connecting terminals 102. In this case, two or more connecting terminals 102 can pass through one hollow hole 201, which can simplify the processing of the hollow holes 201 and make it more convenient and quick to install and align with the connecting terminals 102. Exemplarily, the number of connecting terminals 102 in this embodiment is six; the number of hollow holes 201 on the shielding cover 2 is three, namely the first hollow hole, the second hollow hole and the third hollow hole, and the second hollow hole and the third hollow hole are respectively located at the two ends of the first hollow hole; among the six connecting terminals 102, the four connecting terminals 102 located in the middle pass through the first hollow hole, and the two connecting terminals 102 located on both sides pass through the second hollow hole and the third hollow hole respectively; at the same time, the number of crimping holes 301 on the circuit board 3 is also six, and the six connecting terminals 102 are crimped and matched with the six crimping holes 301 one by one.

[0044] Optionally, in this embodiment, each connection terminal 102 is fixed in the sensor housing 1 by pre-embedding, and the connection method is stable and reliable. Furthermore, the connection terminal 102 is shaped like a fisheye. During assembly, the elastic portions on both sides of the fisheye-shaped connection terminal 102 are squeezed and elastically contracted, allowing the connection terminal 102 to be smoothly inserted into the crimping hole 301 of the circuit board 3, thereby achieving electrical connection between the connection terminal 102 and the circuit board 3. This embodiment uses a fisheye-shaped connection terminal 102, which increases the contact area with the circuit board 3, reduces the contact resistance between the connection terminal 102 and the circuit board 3, and thus reduces heat generation, making it suitable for high current applications. At the same time, the interaction force between the fisheye-shaped connection terminal 102 and the circuit board 3 is increased, making the connection more secure.

[0045] Optionally, in this embodiment, the shape of the magnet 6 is polygonal, the magnet slot 701 is the same shape as the magnet 6, and the magnet 6 is interference-fitted into the magnet slot 701, thereby preventing the magnet 6 from rotating in the magnet slot 701. For example, in this embodiment, the shape of the magnet 6 is square, and the shape of the magnet slot 701 is also square, and the magnet 6 is pressed and installed in the magnet slot 701 to achieve fixation of the two. Furthermore, the inner side wall of the magnet slot 701 is also provided with a plurality of reinforcing ribs to increase the firmness of the interference fit between the magnet 6 and the magnet slot 701, thereby preventing the magnet 6 from falling out of the magnet slot 701.

[0046] In some embodiments, the sensor cover 5 is provided with a plurality of first latches 501 along the circumference, and the sensor housing 1 is provided with a plurality of first latch grooves 103 along the circumference on the side facing the sensor cover 5. Each first latch 501 is connected to each first latch groove 103 in a one-to-one snap-fit ​​connection. This improves the convenience of connecting the sensor cover 5 and the sensor housing 1, eliminates the need for screw assembly, saves time and effort during assembly and disassembly, and helps reduce the size of the sensor. In addition, when the sensor cover 5 and the sensor housing 1 are engaged with each other, the sealing ring 4 can be pressed tightly between the sensor cover 5 and the sensor housing 1, achieving a good seal of the sensor. For example, the sensor cover 5 is provided with four first latches 501 at intervals along the circumference, and the sensor housing 1 is provided with four first latch grooves 103 at intervals along the circumference on the side facing the sensor cover 5, and the connection is stable and reliable. Of course, in other embodiments, the sensor cover 5 can also be provided with a latch groove and the sensor housing 1 can also be provided with a latch, which can also achieve a snap-fit ​​connection between the sensor cover 5 and the sensor housing 1.

[0047] In some embodiments, the rotor base 8 is provided with a plurality of second clips 802 along the circumferential direction, and the sensor cover 5 is provided with a plurality of second slots 502 along the circumferential direction on the side facing the rotor base 8. Each second clip 802 is connected to each second slot 502 in a one-to-one corresponding snap connection. This improves the convenience of connection between the rotor base 8 and the sensor cover 5, and eliminates the need for screw assembly, saving time and effort in assembly and disassembly. For example, the rotor base 8 is evenly provided with four second clips 802 along the circumferential direction, and the sensor cover 5 is evenly provided with four second slots 502 along the circumferential direction on the side facing the rotor base 8, and the connection is stable and reliable. Of course, in other embodiments, clips can also be provided on the sensor cover 5 and slots can be provided on the rotor base 8, which can also achieve a snap connection between the rotor base 8 and the sensor cover 5.

[0048] Furthermore, the rotor end cap 9 is secured to the side of the rotor base 8 facing away from the sensor cover 5 via a snap-fit ​​connection. This snap-fit ​​connection improves the connection convenience between the rotor end cap 9 and the rotor base 8, eliminates the need for screw assembly, and saves time and effort during assembly and disassembly. Optionally, the rotor end cap 9 of this embodiment is made of soft plastic or rubber, which is easy to process and assemble, facilitating a snap-fit ​​connection with the rotor base 8.

[0049] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A Hall position sensor, characterized in that: include: A sensor housing (1), wherein a first accommodating cavity (101) is provided on one side of the sensor housing (1), and a plurality of connecting terminals (102) are fixed in the first accommodating cavity (101); A shielding cover (2) is installed in the first accommodating cavity (101), and a hollow hole (201) is provided on the shielding cover (2) for the connecting terminal (102) to pass through; A circuit board (3) is installed in the shielding cover (2); a plurality of crimping holes (301) are provided on the circuit board (3); each of the connecting terminals (102) passes through the hollow hole (201) and is interference-fitted with the crimping hole (301) by crimping; and a Hall element is provided on the circuit board (3); A sensor cover (5) is fixed to the sensor housing (1) via a snap connection, and a sealing member (4) is provided between the sensor cover (5) and the sensor housing (1); a second accommodating cavity (503) is provided on a side of the sensor cover (5) facing away from the sensor housing (1); A rotor assembly comprises a rotor body (7), a rotor seat (8), a magnet (6) and a rotor end cover (9), wherein the first end of the rotor body (7) is rotatably mounted in the second accommodating cavity (503), the first end of the rotor body (7) is provided with a magnet slot (701), and the magnet (6) is fixed in the magnet slot (701); the second end of the rotor body (7) is rotatably mounted on the rotor seat (8), and the rotor seat (8) is fixed to the sensor cover (5) through a snap connection; the rotor end cover (9) is fixed to the side of the rotor seat (8) facing away from the sensor cover (5) through a snap connection, and the second end of the rotor body (7) passes through the rotor end cover (9).

2. The Hall position sensor according to claim 1, characterized in that: The sealing member (4) is a rubber sealing ring.

3. The Hall position sensor according to claim 1, wherein: Each of the connecting terminals (102) is arranged along an arc-shaped track in the first accommodating cavity (101), and the hollow hole (201) on the shielding cover (2) is arranged in an arc shape.

4. The Hall position sensor according to claim 3, characterized in that: The number of the connecting terminals (102) is six; the shielding cover (2) is provided with three hollow holes (201), namely a first hollow hole, a second hollow hole and a third hollow hole, and the second hollow hole and the third hollow hole are respectively located at the two ends of the first hollow hole; among the six connecting terminals (102), the four connecting terminals (102) located in the middle pass through the first hollow hole, and the two connecting terminals (102) located on both sides pass through the second hollow hole and the third hollow hole respectively.

5. The Hall position sensor according to claim 1, wherein: Each of the connecting terminals (102) is fixed in the sensor housing (1) by pre-embedding.

6. The Hall position sensor according to claim 1, characterized in that: The connecting terminal (102) is in a fisheye shape.

7. The Hall position sensor according to claim 1, wherein: The magnet (6) is polygonal in shape, the magnet slot (701) matches the shape of the magnet (6), and the magnet (6) is interference-fitted into the magnet slot (701).

8. The Hall position sensor according to claim 1, wherein: The material of the rotor end cover (9) is soft plastic or rubber.

9. The Hall position sensor according to any one of claims 1 to 8, characterized in that: The sensor cover (5) is provided with a plurality of first snap fasteners (501) along the circumferential direction, and the sensor housing (1) is provided with a plurality of first slots (103) along the circumferential direction on a side facing the sensor cover (5), and the first snap fasteners (501) are snap-connected with the first slots (103) in a one-to-one corresponding manner.

10. The Hall position sensor according to any one of claims 1 to 8, characterized in that: The rotor seat (8) is provided with a plurality of second snap fasteners (802) along the circumferential direction, and the sensor cover (5) is provided with a plurality of second slots (502) along the circumferential direction on one side facing the rotor seat (8), and the second snap fasteners (802) are snap-connected with the second slots (502) in a one-to-one corresponding manner.

Images