TWI759159B - Magnetic sensor and limit device - Google Patents

Abstract

A magnetic sensor includes a sensor body and at least one limiting device. The sensor body is suitable for detecting magnetic objects. The limiting device is detachably mounted on the sensor body, and includes a mounting seat and a limiting rotary 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 placement slot. The rod placement groove has a rod body groove part and an expansion groove part, and the width of an opening of the rod body groove part at the clamping structure is smaller than that of other parts. The limiting rotary rod includes a rod body and two clamping blocks. At least one concave section is formed on the side of the rod body, and the diameter and width of the rod body at the concave section are smaller than other parts. The limiting rotary rod can be inserted into the rod slot with the concave section aligned with the clamping structure; the limiting rotary rod is limited and cannot be separated from the mounting seat when the limiting rotary rod is located in the rod slot and the concave section is not aligned with the clamping structure. The clamping block can protrude from the through opening of the expansion groove part and be clamped against the inner wall of a groove.

Description

Magnetic sensor and limit device

The present invention relates to a magnetic sensor and a limiting device, in particular to a magnetic sensor and a limiting device suitable for being installed in a pressure cylinder.

The magnetic pressure cylinder is a pressure cylinder with magnetic objects such as magnetic rings installed on the piston. The magnetic sensor installed on the casing can detect the travel position of the piston, thereby controlling the operation state of the magnetic pressure cylinder. Generally speaking, the magnetic sensor can be fixed on the magnetic pressure cylinder by binding with a strap, or fixed on the magnetic pressure cylinder with a specific clamping structure. However, the above-mentioned fixing method has disadvantages such as inconvenience in disassembling and assembling the magnetic sensor or changing the installation position, and when the structure and specification of the magnetic pressure cylinder are different, the problem that 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 limiting device of the present invention is suitable for being mounted on an object, and can be fixed in a groove in a position-adjustable manner. The limiting device includes a mounting seat and a limiting rotary rod. The mounting base includes a bottom wall, a first vertical wall protruding from the bottom wall, a second vertical wall protruding from the bottom wall and opposite to the first vertical wall, a second vertical wall disposed on the first vertical wall and the first vertical wall. A blocking structure on the same side of the two vertical walls, and a blocking structure disposed on the other side of the first vertical wall and/or the second vertical wall and connected with the blocking structure The structure is spaced relative to the clamping structure. The bottom wall, the first vertical wall and the second vertical wall cooperate to define a rod placement slot, and the rod placement slot has a shaft groove portion and an expansion groove portion that communicates with the shaft groove portion and is adjacent to the bottom wall. The groove width of the shaft groove portion is smaller than that of 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 respectively forms a through opening on the side corresponding to the blocking structure and the clamping structure. The limiting rotary rod includes a shaft, and two clamping blocks arranged on opposite sides of the shaft in a rotationally symmetrical manner. The side surface of the shaft is concave to form at least one concave section, and the diameter and width of the shaft corresponding to the concave section are smaller than other parts. Wherein, the limiting rotary rod can be aligned with the clamping structure with the concave section, and inserted into the rod placement groove through the opening and the through port, so that the rod body is located in the rod body groove part and the clamping blocks located in the expansion groove. When the limiting rotary rod is located in the rod setting groove and the concave section is not aligned with the clamping structure, it is limited and cannot be disengaged from the mounting seat. The limiting rotary rod can be operated to rotate according to its own axis, so as to change the state of the clamping blocks in the expansion groove portion and the state of protruding from the through openings; the clamping blocks from the through openings When protruding, it can be stuck 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 latching inclined surface extending obliquely upward from an outer edge of the bottom surface and connected to the shaft. Each locking block is defined by the abutting inclined surface to form a structure with a gradual height and a gradual thickness, and can be clamped against the inner wall of the groove by the abutting inclined surfaces after the rotation of the limiting rod.

In some embodiments, each clamping block is in the shape of a thick bottom and a thin top, and has a gradual thickness in the longitudinal direction of the shaft, and has a gradual height in the clockwise circumferential direction of the bottom view of the shaft. In the longitudinal direction of the body, the parts where the thickness of each clip block is smaller have a lower height.

In some embodiments, the expansion groove portion is wide at the bottom and narrow at the top, and the expansion groove portion is The height and width are greater than those of the blocks.

In some embodiments, the through openings of the expansion groove portion are bell-shaped, and the latching inclined surfaces are arc-shaped.

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; when the limiting screw rod is located in the rod placement groove, it can slide along the concave hole It moves up and down, and can limit up and down the blocks 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 communicated with the shaft groove portion. 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 that of the shaft groove portion. The limiting rotary rod also includes a rod head disposed at the top of the rod body and having a diameter and width larger than that of the rod body, the diameter and width of the rod head being between the groove width of the head groove and the groove of the shaft groove between widths.

In some embodiments, the clamping structure has two protruding blocks opposite to each other and disposed on the first vertical wall and the second vertical wall respectively, and the width of the opening between the protruding blocks corresponds to the corresponding width of the shaft. The diameter and width of the concave section correspond.

In some embodiments, two concave sections on opposite sides are formed on the side surface of the shaft, and the concave sections and the clamping blocks do not overlap in the length direction of the shaft.

In some embodiments, an outer surface of one of the first vertical wall and the second vertical wall forms a clip slot for clipping 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 limit device as described above, the limit The device is detachably mounted on the sensor body.

In some embodiments, the sensor body includes a casing and a base disposed on the bottom side of the casing and suitable for sliding along a groove, the limiting device is installed on the base and suitable for the card fixed to the inner wall of the groove.

The present invention has at least the following effects: by virtue of the configuration of the clamping blocks of the limiting rotary rod, the clamping blocks can be easily clamped at the inner wall of the groove through the rotating operation of the limiting rotary rod , so as to facilitate the disassembly and assembly of the magnetic sensor and the change of the installation position. Due to the structural configuration of the grading height and the grading thickness of the clips, the limiting devices can be installed in grooves of different structural types, thereby improving the convenience in use.

100: Magnetic sensor

200: Pressure cylinder

201: Trench

300: Installation Tools

1: Sensor body

11: Shell

12: Base

13: Clip structure

14: Indicator light

15: Control panel

16: Wire

2: Limiting device

3: Mounting seat

31: Bottom wall

311: Recessed hole

32: The first wall

33: Second vertical wall

331: snap 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: Underside

432: Card against the inclined plane

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a perspective view illustrating the embodiment of the magnetic sensor of the present invention installed in a pressure cylinder; FIG. 2 1 is an exploded view; FIG. 3 is a perspective view illustrating an embodiment of the magnetic sensor of the present invention; FIG. 4 is an exploded view of FIG. 3 ; Embodiment; FIG. 6 is a side view illustrating the implementation of a limit rotary rod of the limiting device; FIG. 7 is a bottom view of the limit rotary rod; FIG. 8 is a perspective view illustrating the limit rotary rod. The state in which the rod is installed in a mounting seat; Fig. 9 is a side view corresponding to Fig. 8; Fig. 10 is a perspective view illustrating the state after the limiting rotary rod is completely installed in the mounting seat; Fig. 11 is a side view corresponding to Fig. 10; Fig. 12 is a front view Fig. 13 is a view similar to Fig. 12, illustrating the state that the magnetic sensor has been clamped in the groove of the pressure cylinder 14 is a partial enlarged view of FIG. 13 ; FIGS. 15 and 16 are a perspective view and an exploded perspective view, illustrating a modified embodiment of the limiting device.

Referring to FIG. 1 to FIG. 3 , it is an embodiment of the magnetic sensor 100 of the present invention. The magnetic sensor 100 is suitable for being installed on an object having a magnetic substance inside, such as a pressure cylinder 200 , and can be used for position detection of the 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 thereof, and a piston (not shown) with a magnetic ring is installed therein. In the figure, the magnetic sensor 100 is installed in one of the grooves 201 in a changeable position, so as to detect the operating position of the piston, so it can be used for 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 the present embodiment, the magnetic sensor 100 is described by setting two limiting devices 2 as an example, but the implementation is not limited to this number.

The sensor body 1 is suitable for detecting magnetic objects, and includes a casing 11, a The bottom side of the casing 11 is suitable for sliding along the groove 201 , the base 12 , the two clamping structures 13 respectively disposed on the front and rear sides of the base 12 , and the two indicator lights located on the top side of the casing 11 . 14. A control panel 15 located on the top side of the housing 11, and a wire 16 extending into the interior of the housing 11. A sensing module (not shown) for detecting magnetic substances and electrically connected to the wire 16 is disposed in the casing 11 , and the running position of the piston in the pressure cylinder 200 can be detected by the sensing module. . The latching structures 13 are implemented in the form of dovetails, for example, so as to be connected with the limiting devices 2 , but the structural forms can be arbitrarily changed as required. The indicator lights 14 can, for example, display lights of different colors, so as to display the operation status of the magnetic sensor 100 . The operation panel 15 can be used for the user to perform the operation setting and operation control of the magnetic sensor 100 . The wire 16 can be connected with an external device (not shown), so as to provide the functions of power supply and signal transmission.

Referring to FIG. 2 to FIG. 5 , the limiting devices 2 are suitable for being installed on objects such as the sensor body 1 , and can be fixed in a groove 201 in a position-adjustable manner. Each limiting device 2 includes a mounting seat 3 and a limiting rotating rod 4 . The limiting rotating rod 4 is installed in the mounting seat 3 in a removable and rotatable manner. 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 a first vertical wall 32 protruding upward from one side of the bottom wall 31 , and a bottom wall 31 from the other side of the bottom wall 31 . A second vertical wall 33 protruding sideways and opposite to the first vertical wall 32, a blocking structure 35 disposed on the same side of the first vertical wall 32 and the second vertical wall 33 (at the upper left in FIG. 5), and a clamping structure 34 disposed on the other side of the first vertical wall 32 and/or the second vertical wall 33 (at the lower right in FIG. 5 ) and opposite to the blocking structure 35 at a distance.

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 rod 4 can be inserted. The outer surface of one of the first vertical wall 32 and the second vertical wall 33 forms a clip slot 331 for clipping with the object (that is, the sensor body 1 ). In this embodiment, the clip For example, the groove 331 is formed on the side of the second vertical wall 33 away from the first vertical wall 32, and is realized in the form of a dovetail groove, so that it can be mutually locked with the latching 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 above-mentioned embodiments. In the present embodiment, the blocking structure 35 is realized by, for example, a horizontal strip-shaped structure whose two ends are respectively connected to the first vertical wall 32 and the second vertical wall 33 as shown in FIG. 4 and are spaced apart from the bottom wall 31 . When the limiting lever 4 is installed in the mounting seat 3 , the blocking structure 35 can provide a blocking effect to one side of the limiting lever 4 , so as to prevent the limiting lever 4 from escaping from a side of the blocking structure 35 . The mounting seat 3 is disengaged from the side. The clamping structure 34 has two protruding blocks 341 that are opposite to each other and are respectively disposed on the first vertical wall 32 and the second vertical wall 33 , and the space between the protruding blocks 341 can be used for specific parts ( Describing later) penetrate into the mounting seat 3 , in addition, after the limiting rotary rod 4 is installed on the mounting seat 3 , the limiting rod 4 can be restrained by the bumps 341 . However, the clamping structure 34 can also be formed with only one protrusion 341 , and a single protrusion 341 can be installed on either the first vertical wall 32 or the second vertical wall 33 , which can also achieve the above functions.

Referring to FIG. 4 , FIG. 5 , FIG. 8 and FIG. 10 , the bottom wall 31 , the first vertical wall 32 and the second vertical wall 33 cooperate to define a rod setting slot 36 for accommodating the limiting rotary rod 4 . The shaft slot 36 has a head slot 361 , a shaft slot 362 communicating with the head slot 361 , and an expansion slot 363 communicating with the shaft slot 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 from the bottom wall 31 than the shaft groove portion 362 , and has a groove width larger than that of the shaft groove portion 362 . The groove width of the shaft groove portion 362 is smaller than that of the expansion groove portion 363 , and the shaft groove portion 362 has an opening on the side corresponding to the clamping structure 34 (the opening is toward the lower right in FIG. 5 ). The opening The width at the clamping structure 34 is smaller than elsewhere. The expansion groove portion 363 is wide at the bottom and narrow at the top, and forms a through opening on the side corresponding to the blocking structure 35 and the clamping structure 34 respectively. In this embodiment, the through openings of the expansion groove portion 363 are each in the shape of a bell to correspond to the structural shape of the limiting rotary rod 4 .

Referring to FIGS. 5 to 8 and 12 , the shape of the limiting screw rod 4 is similar to a special-shaped screw without threads, which includes a shaft 41 , a top of the shaft 41 and a diameter and width larger than the shaft 41 . The rod head 42 , and two locking blocks 43 which are rotationally symmetrically arranged on opposite sides of the shaft 41 .

The diameter of the head 42 is between the groove width of the head groove 361 and the groove width of the shaft groove 362 , so it can be accommodated in the head groove 361 but cannot enter the shaft groove 362 in. In addition, the top end of the rod head 42 cooperates with the installation tool 300 , such as a hexagonal wrench, to form a hexagonal lock hole as shown in the figure, so that the installation tool 300 can be used for the rotation and clamping operation. However, the structure formed by the rod head 42 for cooperating with the installation tool 300 is not limited to the inner hexagon locking hole, and it depends on actual needs.

The side surface of the shaft 41 is concavely formed with at least one concave section 411 . In this embodiment, two concave sections 411 located on opposite sides are formed on the side surface of the shaft 41 . The diameter of the shaft 41 corresponding to the equal concave section 411 is smaller than that of other parts, and the diameter of the shaft corresponding to the equal concave section is the same as the opening of the shaft groove 362 at the convex The width of 34 between blocks 341 corresponds. In this way, only when the concave sections 411 are aligned with the positions between the protruding blocks 341, the limiting rotary rod 4 can be smoothly When inserted into the rod slot 36 , if the position between the protrusions 341 is aligned with the positions other than the concave sections 411 , the limiting rod 4 will be blocked by the protrusions 341 and cannot enter The rod slot 36 is placed. Correspondingly, when the limit lever 4 is located in the lever placement slot 36, if the concave sections 411 are not aligned with the convex blocks 341, the limit lever 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 blocks 43 are thick at the bottom and thin at the top, and respectively have a bottom surface 431 extending laterally from the shaft 41 , and a curved surface extending upward from the outer edge of the bottom surface 431 and connecting the shaft 41 . The card abuts the inclined surface 432. Each clamping block 43 is thick at the bottom and thin at the top, and is defined by the clamping inclined surface 432 to form a structure with a gradual height and a gradual thickness. Specifically, each block 43 has a gradual thickness in the longitudinal direction of the shaft 41 , and has a gradual height in the clockwise circumferential direction of the bottom view of the shaft 41 , roughly in the longitudinal direction of the shaft 41 . The parts with smaller thicknesses of the upper clamping blocks 43 have lower heights. 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 , the height of the left side (marked A) is lower than the height of the right side, and it can be seen from FIG. A) is thinner than the other side (marked B). With the structural configuration of the locking blocks 43 , the limiting devices 2 can be caused to protrude from the rod setting grooves 36 by the rotation of the limiting rotating rods 4 to be locked against the locking blocks 43 . 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 the clamping and fixing of the grooves 201 of different specifications and shapes.

Referring to Figure 5, Figure 8 to Figure 11, the limiting rod 4 can be installed at the mounting seat 3 without using a tool, and can also be removed from the mounting seat 3 without using a tool. Move out. When the limiting rod 4 needs to be installed at the mounting seat 3, the rod head 42 can be aligned with the rod head groove 361, and the concave sections 411 of the rod body 41 can be aligned with the rod head 41 respectively. The bumps 341 of the clamping structure 34 are clamped, and the The locking blocks 43 are aligned with the expansion groove 363 , so that the limiting rod 4 can smoothly pass through the opening of the shaft groove 362 and the expansion groove 363 as shown in FIGS. 8 and 9 . into the rod slot 36 . Then, as shown in FIGS. 10 and 11 , the bottom end of the shaft 41 can be inserted into the concave hole 311 of the mounting seat 3 to complete the installation of the limiting rotary rod 4 . After the installation is completed, although the height and width of the expansion groove portion 363 are larger than those of the locking blocks 43 so that the limiting rod 4 can move up and down along the concave hole 311 and can rotate in the rod setting groove 36, the limit The positioning rod 4 is limited by the top surface of the bottom wall 31 and the bottom side of the shaft groove 362 to the blocks 43 up and down, and the bottom wall 31 , the first vertical wall 32 , the second vertical wall 33. The cooperation of the clamping structure 34 and the blocking structure 35 limits the range of movement of the limiting lever 4 in the lateral direction, thereby ensuring that the limiting lever 4 is not aligned with the concave sections 411 The bump 341 cannot be disengaged from the mounting seat 3 . Correspondingly, if it is necessary to remove the limiting lever 4 from the mounting seat 3, just lift the limiting lever 4 and align the concave sections 411 with the bumps 341 (that is, the lever body). The narrowest part of the diameter and width of 41 is aligned with the narrowest part of the opening), the limiting rotary rod 4 can be moved out of the rod setting slot 36 .

Referring to FIG. 1 , FIG. 2 , and FIGS. 12 to 14 , when the magnetic sensor 100 needs to be installed on the pressure cylinder 200 , the limiting devices 2 can be installed on the The clamping structures 13 of the sensor main body 1 allow the clamping blocks 43 of the limiting rotary rod 4 to be accommodated in the expansion groove portion 363 . Subsequently, the limiting devices 2 and the base 12 of the sensor body 1 can be installed into the selected grooves 201 from above or from the front and rear sides. Since the blocking blocks 43 of the limiting rotary rod 4 are accommodated in the expansion groove portion 363 and do not protrude laterally outside the mounting seat 3 during the installation process, they can be directly accessed from above the groove 201 . Put the magnetic sensor 100 into the groove 201 , there is no need to worry that the blocks 43 will hinder the installation, and the user is not limited to perform the magnetic sensor only from the front or rear of the groove 201 installation of the detector 100. After the magnetic sensor 100 is placed in a predetermined position, the mounting tool 300 can be used to exert force on the rod head 42 of the limit lever 4, so that the limit lever 4 is operated to rotate according to its own axis, The state of the blocking blocks 43 being accommodated in the expansion groove portion 363 and the state of protruding from the through openings are changed. As shown in FIG. 14 , when the blocking blocks 43 protrude from the through openings of the expansion grooves 363 , they can be stuck against the top side of the inner wall of the groove 201 , thereby providing the effect of clamping and fixing, and the magnetic The sex sensor 100 is firmly fixed on the pressure cylinder 200 . Moreover, due to the structural configuration of the gradient height and thickness of the clips 43, they can be flexibly applied to grooves 201 of different shapes, for example, the grooves 201 are converted from a C-shaped groove in the drawing to a T-shaped groove, or When the size and shape are changed, the same limiting devices 2 can be used to fix the magnetic sensor 100 , which can improve the flexibility and convenience in use.

Referring to FIG. 15 and FIG. 16 , it is a modified embodiment of the limiting device 2 . Compared with the previous embodiment, the main difference of this modified embodiment is that the limiting rotary rod 4 only has a shaft 41 and two clamping blocks 43 , and does not form the rod 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 rod shaft groove portion 362 corresponding to the rod shaft 41 and an expansion groove portion 363 corresponding to the corresponding clamping block 43 , and does not form the groove width as described above. Large head groove portion 361. However, in this variant embodiment, the limiting lever 4 can still be installed in the mounting seat 3 in such a way that the concave sections 411 are aligned with the convex blocks 341 laterally, and can also be installed in the mounting seat 3 by The way of rotation allows the locking blocks 43 to be locked against the inner wall of the groove 201 , so as to achieve a fixing effect.

In view of the above, the magnetic sensor 100 and the limiting device 2 of the present invention can simply rotate the limiting lever 4 to make the limiting lever 4 through the disposition of the locking blocks 43 of the limiting lever 4 . The clamping block 43 is clamped at the inner wall of the groove 201, so that the disassembly and assembly of the magnetic sensor 100 and the installation position are facilitated. transform. In addition, through the structural arrangement of the grading heights and the grading thicknesses of the blocks 43 , the limiting devices 2 can be installed in the grooves 201 of different structural forms, so as to improve the flexibility and convenience in use. Therefore, the magnetic sensor 100 and the limiting device 2 of the present invention can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the scope of the application for patent of the present invention and the content of the patent specification are still within the scope of the present invention. within the scope of the invention patent.

100: Magnetic sensor

200: Pressure cylinder

201: Trench

1: Sensor body

2: Limiting device

Claims (12)

A limiting device is suitable for being installed on an object and can be clamped in a groove in a position-adjustable manner. The limiting device comprises: a mounting seat, including a bottom wall, a a first vertical wall, a second vertical wall protruding from the bottom wall and opposite to the first vertical wall, a blocking structure arranged on the same side of the first vertical wall and the second vertical wall, and a blocking structure arranged on the first vertical wall A clamping structure on the other side of a 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 slot, and the rod placement slot has a shaft groove part and an expansion groove part communicating with the shaft groove part and adjacent to the bottom wall, the groove width of the shaft groove part is smaller than that of the expansion groove part, and the shaft groove part is in a position corresponding to the clamping structure The side has an opening, the width of the opening at the clamping structure is smaller than that of other parts, the expansion groove part forms a through opening on the side corresponding to the blocking structure and the clamping structure, respectively; and a limit rotation rod, including a rod body, and two clamping blocks arranged rotationally symmetrically on opposite sides of the shaft, the side of the shaft is concave to form at least one concave section, and the diameter of the shaft at the corresponding concave section is smaller than other parts , wherein the limiting rotary rod can be aligned with the clamping structure with the concave section, and inserted into the rod placement slot from the opening and the through port, so that the shaft is located in the shaft groove and the clamping The block is located in the expansion groove part; the limit rotary rod is located in the rod placement groove and the concave section is not aligned with the clamping structure, it will be limited and cannot be separated from the mounting seat; the limit rotary rod can be operated according to The axis of itself rotates to change the state of the blocks in the expansion groove portion and the state of protruding from the through openings; the blocks can be stuck in the groove when protruding from the through openings the inner wall of the groove. The limiting device as claimed in claim 1, wherein each of the blocks has a bottom surface extending laterally from the shaft, and a bottom surface extending obliquely upward from the outer edge of the bottom surface and connected to the shaft Each clamping block is defined by the clamping inclined surface to form a structure with gradual height and gradual thickness, and can be clamped against the inner wall of the groove by the clamping inclined surfaces after the limiting rotary rod is rotated. The limiting device according to claim 2, wherein each of the clips is in the shape of a thick bottom and a thin top, and has a gradual thickness along the length direction of the shaft, and has a clockwise circumferential direction in the bottom view of the shaft. Gradient height, in the length direction of the shaft, the parts with smaller thickness of each clip have a lower height. The limiting device according to claim 3, wherein the expansion groove portion has a shape with 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 through openings of the expansion groove portion are bell-shaped, and the latching inclined surfaces are arc-shaped. The limiting device as claimed in 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 limiting rotary rod is located in the rod setting groove It can move up and down along the concave hole, and can limit up and down the blocks 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 communicated with the rod shaft groove part The rod head groove part, the rod head groove part is farther from the bottom wall than the shaft groove part, and the groove width of the rod head groove part is larger than the shaft groove part; The top of the body and the diameter and width are larger than the head of the shaft, and the diameter of the head is between the groove width of the groove part of the head and the groove width of the groove part of the shaft. The limiting device according to claim 1, wherein the clamping structure has two protruding blocks opposite to each other and disposed on the first vertical wall and the second vertical wall respectively, and the width of the opening between the protruding blocks is equal to The diameter of the shaft corresponding to the concave section corresponds to the width. The limiting device according to claim 1, wherein two concave sections on opposite sides are formed on the side surface of the shaft, and the concave sections and the blocks do not overlap in the length direction of the shaft. The limiting device according to claim 1, wherein an outer surface of one of the first vertical wall and the second vertical wall forms a clip slot for clipping with the object. A magnetic sensor, comprising: a sensor main body, suitable for detecting magnetic objects; and at least one limiting device as described in any one of claims 1 to 10, detachably installed in the sensor device body. The magnetic sensor according to claim 11, wherein the sensor body comprises a casing and a base disposed on the bottom side of the casing and suitable for sliding along a groove, and the limiting device is installed on the base and suitable for being fastened to the inner wall surface of the groove.

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