TWM614097U - Magnetic sensor and position limiting device - Google Patents

Abstract

A magnetic sensor includes a sensor main body and at least one limiting device. The sensor body is suitable for detecting magnetic objects. The limit device is detachably installed on the sensor main body, and includes a mounting seat and a limit rotating rod. The mounting seat includes a bottom wall, a first vertical wall, a second vertical wall, a blocking structure and a clamping structure, and has a rod-holding groove. The rod placement groove has a shaft groove portion and an expansion groove portion, and the width of an opening of the shaft groove portion at the clamping structure is smaller than other parts. The limit rotating rod includes a shaft and two clamping blocks. At least one concave section is formed on the side of the shaft, and the diameter of the shaft at the concave section is smaller than other parts. The limit rotating rod can be placed in the rod groove with the concave section aligned with the clamping structure; the limit rotating rod is located in the rod groove and the concave section is not aligned with the clamp structure, it is restricted and cannot be separated from the mounting seat. The blocking block can protrude from the through opening of the expansion groove and clamp against the inner wall of a groove.

Description

Magnetic sensor and limit device

The new model relates to a magnetic sensor and a limit device, in particular to a magnetic sensor and a limit device suitable for being installed in a pressure cylinder.

The magnetic pressure cylinder is a pressure cylinder with a magnetic ring and other magnetic objects installed on the piston. The magnetic sensor installed on the casing can detect the travel position of the piston to control the operating state of the magnetic pressure cylinder. Generally speaking, the magnetic sensor can be fixed on the magnetic pressure cylinder by means of a band, or can be fixed on the magnetic pressure cylinder with a specific fixing structure. However, the above-mentioned fixing method has disadvantages such as inconvenient disassembly and assembly of the magnetic sensor or replacement of the installation position, and when the structure and specifications of the magnetic pressure cylinder are different, the problem of the magnetic sensor cannot be installed smoothly may occur.

Therefore, one of the objectives of the present invention is to provide a limiting device that can solve the aforementioned problems.

Therefore, in some embodiments, the novel position-limiting device is suitable for being installed on an object, and can be clamped in a groove in an adjustable position. The limiting device includes a mounting seat and a limiting rotating rod. The mounting seat includes a bottom wall, a first vertical wall protruding from the bottom wall, a second vertical wall protruding from the bottom wall and spaced apart from the first vertical wall, and a second vertical wall disposed on the first vertical wall and the first vertical wall. The blocking structure on the same side of the two vertical walls, and a clamping structure arranged on the other side of the first vertical wall and/or the second vertical wall and opposite to the blocking structure. The bottom wall, the first vertical wall and the second vertical wall cooperate to define a rod placement groove, and the rod placement groove has a shaft groove portion and an expansion groove portion connected to the shaft groove portion and adjacent to the bottom wall. The groove width of the shaft groove is smaller than the expansion groove, and the shaft groove has an opening on the side corresponding to the clamping structure. The width of the opening at the clamping structure is smaller than other parts, and the expansion groove portion respectively forms a through opening on the side corresponding to the blocking structure and the clamping structure. The limit rotating rod includes a shaft and two clamping blocks which are rotationally symmetrically arranged on the opposite sides of the shaft. The side surface of the shaft is recessed to form at least one concave section, and the diameter of the shaft corresponding to the concave section is smaller than other parts. Wherein, the limiting rotating rod can be aligned with the clamping structure with the recessed portion, and inserted into the rod placement groove from the opening and the through opening, so that the shaft is located in the shaft groove and the clamping blocks Located in the expansion groove. When the limiting rotating rod is located in the rod placement groove and the concave section is not aligned with the clamping structure, it is restricted and cannot be separated from the mounting seat. The limit rotary rod can be operated to rotate according to its own axis, so that the state of the blocks received in the expansion groove and the state of protruding from the openings are changed; the blocks are changed from the openings When protruding, it can be pressed against the inner wall of the groove.

In some embodiments, each of the clamping blocks has a bottom surface extending laterally from the shaft, and a blocking inclined surface extending upwardly from the outer edge of the bottom surface and connecting the shaft. Each clamping block is defined by the clamping inclined surface to have a structure with a gradual height and a gradual thickness, and can be clamped against the inner wall of the groove by the clamping inclined surfaces after the limiting rotary rod rotates.

In some embodiments, each block has a bottom thickness and a thin top, and has a gradually changing thickness in the length direction of the shaft, and has a gradually changing height in the circumferential direction of the shaft. The lower part of the upper block has a lower height.

In some embodiments, the expansion groove has a wide bottom and a narrow top, and the height and width of the expansion groove are larger than the blocks.

In some embodiments, the openings of the expansion groove portion are bell-shaped, and the engaging inclined surfaces are arcuate.

In some embodiments, the bottom wall of the mounting seat forms a concave hole on the top surface into which the bottom end of the shaft can be inserted; It moves up and down, and can limit the clamping blocks up and down by the top surface of the bottom wall and the top side of the expansion groove.

In some embodiments, the rod placement groove further has a head groove portion exposed on the top side of the first vertical wall, the second vertical wall, the blocking structure and the clamping structure and connected to the shaft groove portion. The head groove part is farther away from the bottom wall than the shaft groove part, and the groove width of the head groove part is larger than the shaft groove part. The limit spin rod also includes a club head which is arranged at the top of the shaft and has a larger diameter than the shaft. The diameter and width of the head is between the groove width of the groove of the head and the groove of the groove of the shaft. Wide between.

In some embodiments, the clamping structure has two oppositely spaced protrusions respectively disposed on the first vertical wall and the second vertical wall, and the width of the opening between the protrusions corresponds to that of the shaft The diameter of the concave section corresponds to the width.

In some embodiments, the side surface of the shaft forms two recessed portions located on opposite sides, and the recessed portions and the blocking blocks do not overlap in the length direction of the shaft.

In some embodiments, the outer surface of one of the first vertical wall and the second vertical wall forms a clamping groove for clamping with the object.

Another object of the present invention is to provide a magnetic sensor. The magnetic sensor includes a sensor body suitable for detecting magnetic objects, and at least one limiting device as described above, and the limiting device is detachably mounted on the sensor body.

In some embodiments, the sensor main body includes a housing and a base disposed on the bottom side of the housing and suitable for sliding along a groove, and the limiting device is installed on the base and suitable for clamping. Fixed on the inner wall of the groove.

The present invention has at least the following functions: by the arrangement of the locking blocks of the limiting rotary rod, the locking blocks can be fixed at the inner wall of the groove simply by rotating the limiting rotary rod. Therefore, it is convenient to disassemble and install the magnetic sensor and change the installation position. With the gradual height and gradual thickness of the blocks, the position-limiting devices can be installed in grooves of different structural types, which improves the convenience of use.

Refer to FIGS. 1 to 3, which are an embodiment of the new magnetic sensor 100. The magnetic sensor 100 is suitable for being installed on an object with a magnetic substance inside, such as a pressure cylinder 200, and can be used to detect the position of a magnetic substance. In this embodiment, the pressure cylinder 200 is a magnetic pressure cylinder. A plurality of grooves 201 in the form of C-shaped grooves are formed on the surface and a piston (not shown) equipped with a magnetic ring is installed inside. In the figure, the magnetic sensor 100 is installed at one of the grooves 201 in a position-changing manner, so as to detect the operating position of the piston, so that it can be applied to the operation control of the pressure cylinder 200.

Referring to FIGS. 1 to 4, the magnetic sensor 100 includes a sensor body 1 and at least one limiting device 2 detachably mounted on the sensor body 1. In this embodiment, the magnetic sensor 100 is illustrated with two limiting devices 2 as an example, but the number is not limited in implementation.

The sensor main body 1 is suitable for detecting magnetic objects, and includes a housing 11, a base 12 arranged on the bottom side of the housing 11 and suitable for sliding along the groove 201, and two bases 12 respectively arranged on the base 12 The clamping structure 13 on the front and rear sides of the housing 11, two indicator lights 14 on the top side of the housing 11, a control panel 15 on the top side of the housing 11, and a wire 16 extending into the inside of the housing 11. The housing 11 is provided with a sensing module (not shown) for detecting magnetic substances and electrically connected to the wire 16, and the operating position of the piston in the pressure cylinder 200 can be detected by the sensing module . The clamping structures 13 are implemented in the form of a dovetail, for example, to facilitate the connection with the limiting devices 2, but the structural form can be changed as needed. The indicator lights 14 can display lights of different colors, for example, to show the operating status of the magnetic sensor 100. The control panel 15 allows the user to perform the operation setting and operation control of the magnetic sensor 100. The wire 16 can be connected to an external device (not shown) to provide power supply and signal transmission functions.

Referring to FIGS. 2 to 5, the position-limiting devices 2 are suitable for being installed on objects such as the sensor main body 1, and can be fixed in a groove 201 in an adjustable position. Each limiting device 2 includes a mounting seat 3 and a limiting rotating rod 4, and the limiting rotating rod 4 is removable and rotatably installed in the mounting seat 3. The specific implementation is described as follows.

4, 5, 8 and 9, the mounting seat 3 includes a bottom wall 31, a first vertical wall 32 protruding upward from one side of the bottom wall 31, and another A second vertical wall 33 protruding from the side and spaced opposite to the first vertical wall 32, a blocking structure 35 provided on the same side of the first vertical wall 32 and the second vertical wall 33 (located at the upper left in FIG. 5), And a clamping structure 34 arranged on the other side of the first vertical wall 32 and/or the second vertical wall 33 (located at the lower right in FIG. 5) and spaced apart from the blocking structure 35.

The bottom wall 31 of the mounting seat 3 forms a concave hole 311 on the top surface into which the bottom end of the limiting rotating rod 4 can be inserted. The outer surface of one of the first vertical wall 32 and the second vertical wall 33 forms a clamping groove 331 for clamping with the object (that is, the sensor body 1). In this embodiment, the clamping groove 331 is The groove 331 is, for example, formed on the side of the second vertical wall 33 away from the first vertical wall 32, and is realized in the form of, for example, a dovetail groove, so that it can be locked with the clamping structure 13 in the form of a dovetail, but it depends on the actual situation. As required, the structural forms of the engaging groove 331 and the engaging structure 13 can be adjusted, and are not limited to the foregoing embodiment. In this embodiment, the blocking structure 35 is realized by, for example, a horizontal strip structure that connects the first vertical wall 32 and the second vertical wall 33 and is spaced from the bottom wall 31 at both ends as shown in FIG. 4, when the When the limit rotating rod 4 is installed in the mounting seat 3, the stop structure 35 can provide a blocking effect to one side of the limit rotating rod 4, so as to prevent the limit rotating rod 4 from falling from one side of the blocking structure 35. Side out of the mounting seat 3. The clamping structure 34 has two oppositely spaced protrusions 341 respectively disposed on the first vertical wall 32 and the second vertical wall 33. The space between the protrusions 341 can be used for a specific position of the limiting rotating rod 4 ( (Description later) penetrate into the mounting base 3, in addition, after the limiting rotating rod 4 is installed on the mounting base 3, the protrusions 341 can cause a limiting effect on the limiting rotating rod 4. However, the clamping structure 34 may also only form a bump 341, and a single bump 341 may be installed on any one of the first vertical wall 32 and the second vertical wall 33, which can also achieve the above-mentioned functions.

Referring to FIGS. 4, 5, 8 and 10, the bottom wall 31, the first vertical wall 32 and the second vertical wall 33 cooperate to define a rod placement groove 36 for accommodating the limiting rotating rod 4. The rod placement groove 36 has a head groove portion 361, a shaft groove portion 362 connected to the head groove portion 361, and an expansion groove portion 363 connected to the shaft groove portion 362 and adjacent to the bottom wall 31. The head groove portion 361 is exposed on the top side of the first vertical wall 32, the second vertical wall 33, the blocking structure 35 and the clamping structure 34, and is farther away from the bottom wall 31 than the shaft groove portion 362, and has It is larger than the groove width of the shaft groove 362. The groove width of the shaft groove portion 362 is smaller than the expansion groove portion 363, and the shaft groove portion 362 has an opening on the side corresponding to the clamping structure 34 (in FIG. 5, the opening faces the lower right). The width of the clamping structure 34 is smaller than other parts. The expansion groove 363 has a wide bottom and a narrow top, and a through opening is formed on the side corresponding to the blocking structure 35 and the clamping structure 34. In this embodiment, the openings of the expansion groove portion 363 are each bell-shaped to correspond to the structure of the limiting rotating rod 4.

Referring to Figures 5 to 8 and Figure 12, the shape of the limit screw 4 is similar to a special-shaped screw without thread, which includes a shaft 41, a shaft 41 arranged at the top of the shaft 41 and a diameter wider than the shaft 41 The head 42 and two locking blocks 43 are rotationally symmetrically arranged on the opposite side of the shaft 41.

The diameter of the head 42 is between the groove width of the head groove portion 361 and the groove width of the shaft groove portion 362, so it can be accommodated in the head groove portion 361 but cannot enter the shaft groove portion 362 in. In addition, the top end of the rod head 42 cooperates with the installation tool 300 such as an internal hexagon wrench to form an internal hexagon key hole as shown in the figure, so that the installation tool 300 can be used for rotating and clamping operations. However, the structure formed by the rod head 42 used in conjunction with the installation tool 300 is not limited to the hexagon socket key hole, and it depends on actual needs.

The side surface of the shaft 41 is concavely formed with at least one recessed portion 411. In this embodiment, the side surface of the shaft 41 is implemented by forming two recessed portions 411 on opposite sides. The diameter width of the shaft 41 at the corresponding recessed portions 411 is smaller than other parts, and the diameter width of the shaft corresponding to the recessed portions is the same as the opening of the shaft groove portion 362 in the convex The 34 widths between the blocks 341 correspond to each other. In this way, the limit rotating rod 4 can be smoothly inserted into the rod-setting groove 36 only when the positions of the concave sections 411 are aligned with the positions between the protrusions 341. The position of the section 411 is aligned with the position between the protrusions 341, and the limit rotating rod 4 is blocked by the protrusions 341 and cannot enter the rod placement groove 36. Correspondingly, when the limit rotating rod 4 is located in the rod setting groove 36, if the concave sections 411 are not aligned with the protrusions 341, the limit rotating rod 4 will be limited, so that the limit The rotating rod 4 cannot be separated from the mounting seat, so as to achieve a fixed function.

The clamping blocks 43 have a thick bottom and a thin top, and respectively have a bottom surface 431 extending laterally from the shaft 41, and a bottom surface 431 that extends upwardly from the outer edge of the bottom surface 431 and is connected to the shaft 41 to form a curved surface. The card reaches the slope 432. Each clamping block 43 has a thick bottom and a thin top, and the engaging inclined surface 432 defines a structure with a gradual height and a gradual thickness. Specifically, each block 43 has a gradual thickness in the length direction of the shaft 41, and has a gradual height in the circumferential direction of the shaft 41. Generally speaking, each block 43 has a gradual thickness in the length direction of the shaft 41. 43 The part with the smaller thickness has the lower height. For example, take the block 43 located on the right side in FIG. 6 as an example. The block 43 is located on the upper right side in FIG. 7 and the height of its left side (marked A) is lower than that of the right side, and it can be seen from FIG. 7 that this side (marked The thickness of A) is smaller than that of the other side (marked B). With the structure and configuration of the locking blocks 43, the limiting devices 2 can be caused to protrude from the rod slot 36 by the rotation of the limiting rotating rods 4 to be stuck in The top side of the inner wall of the groove 201 has a structure configuration with a gradual height and a gradual thickness, which is suitable for clamping and fixing grooves 201 of different specifications and shapes.

Referring to Figure 5, Figure 8 to Figure 11, the limit rotation rod 4 can be installed at the mounting base 3 without using tools, and similarly, it can also be installed from the mounting base 3 without using tools. Move out. When the limit rotating rod 4 needs to be installed at the mounting seat 3, the head 42 can be aligned with the head groove portion 361, and the recessed portions 411 of the shaft 41 can be aligned with the Clamp the protrusions 341 of the clamping structure 34, and align the clamping blocks 43 with the expansion groove portion 363, so that the limit rotating rod 4 can be smoothly moved from the shaft groove portion as shown in FIG. 8 and FIG. The opening of 362 and the opening of the expansion groove 363 are inserted into the rod placement groove 36. Subsequently, as shown in FIGS. 10 and 11, the bottom end of the shaft 41 can be inserted into the recessed hole 311 of the mounting base 3 to complete the installation of the limit rotating rod 4. After the installation is completed, although the height and width of the expansion groove portion 363 are larger than the clamping blocks 43 so that the limit rotating rod 4 can move up and down along the recessed hole 311 and can rotate in the rod placing groove 36, the limit The position rotation rod 4 is limited by the top surface of the bottom wall 31 and the bottom side of the shaft groove portion 362 to the blocking blocks 43 up and down, and is limited by the bottom wall 31, the first vertical wall 32, and the second vertical wall. 33. The cooperation of the clamping structure 34 and the stopping structure 35 restricts the lateral movement range of the limiting rotating rod 4, thereby ensuring that the limiting rotating rod 4 is not aligned with the recessed portions 411 The bump 341 cannot be separated from the mounting base 3. Correspondingly, if it is necessary to remove the limit rotation rod 4 from the mounting seat 3, just lift the limit rotation rod 4 and align the concave sections 411 with the equal protrusions 341 (that is, the shaft The narrowest part of the diameter and width of 41 is aligned with the narrowest part of the opening), and then the limiting rotating rod 4 can be moved out of the rod-setting groove 36.

Referring to Figure 1, Figure 2, Figure 12 to Figure 14, when the magnetic sensor 100 needs to be installed in the pressure cylinder 200, the limiting devices 2 can be installed in the clamping grooves 331 first. The clamping structures 13 of the sensor main body 1 and the clamping blocks 43 of the limiting rotating rod 4 are accommodated in the expansion groove 363. Subsequently, the limiting device 2 and the base 12 of the sensor main body 1 can be fitted into the selected groove 201 from above or from the front and rear sides. During the installation process, the locking blocks 43 of the limiting rotating rod 4 are accommodated in the expansion groove portion 363 without laterally protruding out of the mounting seat 3, so they can be directly from above the groove 201 Putting the magnetic sensor 100 into the groove 201 does not have to worry that the clips 43 will hinder the installation, and the user is not limited to performing the magnetic sensor only from the front or rear part of the groove 201. The installation of the detector 100. After the magnetic sensor 100 is placed in a predetermined position, the mounting tool 300 can be used to apply force to the head 42 of the limit lever 4 so that the limit lever 4 is operated to rotate according to its own axis. As a result, the state of the blocks 43 received in the expansion groove portion 363 and the state of protruding from the through openings are changed. As shown in FIG. 14, the locking blocks 43 can be pressed against the top side of the inner wall of the groove 201 when protruding from the through openings of the expansion groove portions 363, so that the locking and fixing effect can be provided, and the magnetic The sensory sensor 100 is firmly fixed on the pressure cylinder 200. Moreover, due to the structure configuration of the gradual height and gradual thickness of the blocks 43, they can be flexibly applied to grooves 201 of different shapes. For example, the groove 201 is transformed from a C-shaped groove to a T-shaped groove in the drawing, or When the size and shape are changed, the magnetic sensor 100 can be fixed by the same limiting devices 2 so as to improve the flexibility and convenience in use.

Refer to FIG. 15 and FIG. 16 for a modified implementation aspect of the limiting device 2. Compared with the foregoing embodiment, the main difference of this modified embodiment is that the limit rotation rod 4 only has a shaft 41 and two clamping blocks 43, and does not form a club head 42 with a larger diameter and width as described above. Correspondingly, the rod placement groove 36 of the mounting seat 3 only has a shaft groove portion 362 corresponding to the shaft 41 and an expansion groove portion 363 corresponding to the clamping blocks 43, instead of forming the groove width as described above. Large head groove 361. However, in this modified implementation aspect, the limit rotation rod 4 can still be installed in the mounting seat 3 in such a manner that the concave sections 411 are aligned laterally with the protrusions 341, and can also be installed by The way of rotation allows the blocks 43 to be pressed against the inner wall of the groove 201 to achieve a fixing effect.

Based on the above, the magnetic sensor 100 and the limiting device 2 of the present invention can be arranged by the locking blocks 43 of the limiting rotating rod 4, and simply by rotating the limiting rotating rod 4 to make the The clamping block 43 is clamped to the inner wall of the groove 201, which facilitates the disassembly and assembly of the magnetic sensor 100 and the change of the installation position. In addition, the gradual height and the gradual thickness of the blocks 43 are configured so that the limiting devices 2 can be installed in the grooves 201 of different structures, which improves the flexibility and convenience in use. Therefore, the magnetic sensor 100 and the limiting device 2 of the present invention can indeed achieve the new purpose.

However, the above are only examples of the present model, and should not be used to limit the scope of implementation of the present model, all simple equivalent changes and modifications made in accordance with the patent scope of the present model application and the contents of the patent specification still belong to This new patent covers the scope.

100: Magnetic sensor 200: pressure cylinder 201: groove 300: installation tools 1: Sensor body 11: shell 12: Base 13: Card connection structure 14: indicator light 15: Control panel 16: wire 2: Limiting device 3: Mounting seat 31: bottom wall 311: concave hole 32: The first wall 33: The second vertical wall 331: card slot 34: Clamping structure 341: bump 35: stop structure 36: Rod slot 361: Head Groove 362: Shaft groove 363: Expansion Groove 4: Limit rotary rod 41: Shaft 411: Concave section 42: club head 43: card block 431: Bottom 432: Card to the inclined plane

The other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, among which: Figure 1 is a perspective view illustrating the implementation of the new magnetic sensor installed in a pressure cylinder; Figure 2 is an exploded view of Figure 1; Figure 3 is a perspective view illustrating an embodiment of the new magnetic sensor; Figure 4 is an exploded view of Figure 3; Figure 5 is a three-dimensional exploded view illustrating an embodiment of the new type of limiting device; Figure 6 is a side view illustrating an implementation aspect of a limit rotating rod of the limit device; Figure 7 is a bottom view of the limit rotating rod; Figure 8 is a three-dimensional view illustrating the state of installing the limit rotation rod into a mounting seat; Figure 9 is a side view corresponding to Figure 8; Figure 10 is a three-dimensional view illustrating the state after the limit rotary rod is completely installed in the mounting seat; Figure 11 is a side view corresponding to Figure 10; Figure 12 is a front view illustrating the state where the magnetic sensor is placed in the groove of the pressure cylinder but not yet fixed; Figure 13 is a view similar to Figure 12, illustrating the state that the magnetic sensor has been clamped to the groove of the pressure cylinder; Figure 14 is a partial enlarged view of Figure 13; Figures 15 and 16 are a perspective view and a perspective exploded view illustrating a modified embodiment of the limiting device.

100: Magnetic sensor

200: pressure cylinder

201: groove

1: Sensor body

2: Limiting device

Claims (12)

A limit device is suitable for being installed on an object and can be fixed in a groove in an adjustable position. The limit device includes: A mounting seat includes a bottom wall, a first vertical wall protruding from the bottom wall, a second vertical wall protruding from the bottom wall and spaced apart from the first vertical wall, and a second vertical wall disposed on the first vertical wall and the first vertical wall. The blocking structure on the same side of the second vertical wall, and a clamping structure disposed on the other side of the first vertical wall and/or the second vertical wall and spaced apart from the blocking structure, the bottom wall and the first vertical wall And the second vertical wall cooperate to define a rod placement groove, the rod placement groove has a shaft groove portion and an expansion groove portion communicating with the shaft groove portion and adjacent to the bottom wall, the groove width of the shaft groove portion is smaller than the Expansion groove portion, and the shaft groove portion has an opening on the side corresponding to the clamping structure, the width of the opening at the clamping structure is smaller than other parts, and the expansion groove portion corresponds to the blocking structure and the clamping structure A through opening is formed on the sides; and A limit spinner includes a shaft and two clamping blocks rotationally symmetrically arranged on opposite sides of the shaft. The side surface of the shaft is concavely formed with at least one concave section, and the shaft is corresponding to the concave The diameter at the section is smaller than other parts, Wherein, the limiting rotating rod can be aligned with the clamping structure with the recessed portion, and inserted into the rod placement groove from the opening and the through opening, so that the shaft is located in the shaft groove and the clamping blocks Located in the expansion groove portion; the limit rotation rod is located in the rod placement groove and the concave section is not aligned with the clamping structure, it will be restricted and cannot be separated from the mounting seat; the limit rotation rod can be operated depending on itself The axis rotates to change the state of the blocks received in the expansion groove and the state of protruding from the openings; when the blocks protrude from the openings, they can be clamped against the groove The inner wall. The limiting device according to claim 1, wherein each of the clamping blocks has a bottom surface extending laterally from the shaft, and a blocking inclined surface extending upwardly from the outer edge of the bottom surface and connecting the shaft, Each clamping block is defined by the clamping inclined surface to have a structure with a gradual height and a gradual thickness, and can be clamped against the inner wall of the groove by the clamping inclined surfaces after the limiting rotary rod rotates. The limit device according to claim 2, wherein each block has a thick bottom and a thin top, and has a gradual thickness in the length direction of the shaft, and has a gradual height in the circumferential direction of the shaft, and In the length direction of the shaft, the parts where the thickness of each block is smaller have a lower height. The limiting device according to claim 3, wherein the expansion groove portion has a wide bottom and a narrow top, and the height and width of the expansion groove portion are larger than those of the blocks. The limiting device according to claim 4, wherein the openings of the expansion groove portion are bell-shaped, and the engaging inclined surfaces are arcuate. The limit device according to claim 4, wherein the bottom wall of the mounting seat forms a concave hole on the top surface into which the bottom end of the shaft can be inserted; the limit rotation rod is located in the rod slot It can move up and down along the concave hole, and can limit the clamp blocks up and down by the top surface of the bottom wall and the top side of the expansion groove. The limiting device according to claim 1, wherein the rod placement groove further has a top side exposed on the first vertical wall, the second vertical wall, the blocking structure, and the clamping structure and communicates with the shaft groove portion The head groove portion of the shaft, the head groove portion is farther from the bottom wall than the shaft groove portion, and the groove width of the head groove portion is larger than the shaft groove portion; the limit rotation rod further includes a shaft provided on the shaft The tip of the shaft has a larger diameter than the head of the shaft, and the diameter of the head is between the groove width of the groove portion of the shaft and the groove width of the groove portion of the shaft. The limiting device according to claim 1, wherein the clamping structure has two oppositely spaced protrusions respectively disposed on the first vertical wall and the second vertical wall, and the width of the opening between the protrusions is equal to The shaft corresponds to the diameter and width of the concave section. The limiting device according to claim 1, wherein the side surface of the shaft forms two recessed portions located on opposite sides, and the recessed portions and the locking blocks do not overlap in the length direction of the shaft. The limiting device according to claim 1, wherein the outer surface of one of the first vertical wall and the second vertical wall forms a clamping groove for clamping with the object. A magnetic sensor, including: A sensor body, suitable for detecting magnetic objects; and At least one limiting device according to any one of claims 1 to 10 is detachably installed on the sensor body. The magnetic sensor according to claim 11, wherein the sensor main body includes a housing and a base arranged on the bottom side of the housing and suitable for sliding along a groove, and the limiting device is installed It is on the base and is suitable for clamping on the inner wall surface of the groove.

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