A pile foundation center positioning bracket

Abstract

The present invention relates to the field of building structure construction, and specifically discloses a pile foundation center positioning bracket, including a support rod, a positioning mechanism, a base and a telescopic fine-tuning mechanism; the support rod is provided with a scale line, the positioning mechanism includes a positioning base and a locking assembly, the positioning base is slidably matched on the support rod, and the locking assembly is installed in the positioning base; a prism is provided on the base, and the telescopic fine-tuning mechanism includes an end face gear plate and a sliding assembly, and the end face gear plate is rotatably connected to the base; the sliding assembly is slidably matched on the base, and four sliding assemblies are arranged in a ring array along the central axis of the end face gear plate, the sliding assembly is meshed with the end face gear plate, and the end face gear plate synchronously drives the four sliding assemblies to move along the radial direction of the end face gear plate; each sliding assembly is connected to a support rod; and a clamping surface is provided on the side of the positioning base facing the sliding assembly. The positioning bracket has a simple structure, high pile foundation center positioning accuracy, is convenient for construction site operation, and improves construction efficiency and safety.

Description

Technical Field

[0001] The invention relates to the field of building structure construction, and in particular to a pile foundation center positioning bracket. Background Art

[0002] Pile foundation is a commonly used foundation form in industrial and civil construction projects. In order to grasp the center position of the pile foundation in time, after the layout is completed, it is necessary to excavate the bored piles and then bury the steel casing. The steel casing plays the role of positioning the bored piles and protecting the walls.

[0003] When positioning the steel casing, it is necessary to set up a wooden board or steel plate on the mouth of the steel casing, and then the surveyor stands on the wooden board or steel plate to perform the positioning work. However, this method of locating the center of the pile foundation casing has the following problems: (1) The manual positioning method has poor positioning accuracy; (2) As the pile foundation excavation work deepens, the pile foundation depth becomes deeper and deeper, and the safety risk of the pile foundation steel casing center positioning work is greatly increased. If the surveyor stands unsteadily and falls into the steel casing, it will cause serious construction accidents. In view of this, it is urgent to improve the existing method of locating the center of the pile foundation steel casing to increase the positioning accuracy and ensure the safety of the staff. Summary of the invention

[0004] In view of this, an object of the present invention is to overcome the defects in the prior art and provide a pile foundation center positioning bracket.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pile foundation center positioning bracket, comprising a support rod, a positioning mechanism, a base and a telescopic fine-tuning mechanism; the support rod is provided with a scale line, the positioning mechanism comprises a positioning base and a locking assembly, the positioning base is slidably matched on the support rod, and the central axis of the support rod is perpendicular to the central line of the length direction of the positioning base; the locking assembly is installed in the positioning base, and the locking assembly is used to lock the positioning base on the support rod;

[0007] The base is provided with a prism, the telescopic fine-tuning mechanism comprises an end face gear plate and a sliding assembly, the end face gear plate is rotatably connected to the base, and the prism is coaxially arranged with the end face gear plate;

[0008] The sliding assembly is slidably fitted on the base, and the four sliding assemblies are arranged in a ring array along the central axis of the end gear plate. The sliding assembly is meshed with the end gear plate, and the end gear plate synchronously drives the four sliding assemblies to move along the radial direction of the end gear plate; each sliding assembly is connected to a support rod, and the central axes of the four support rods are arranged in a cross shape; a clamping surface is provided on the side of the positioning base facing the sliding assembly, and the clamping surface is arranged perpendicular to the support rod.

[0009] Furthermore, the sliding assembly includes a driven gear, a fine-tuning screw, a nut and a slide; the driven gear is meshed with the end gear plate, the fine-tuning screw is rotatably connected to the base, the fine-tuning screw is coaxially connected to the driven gear, and the fine-tuning screw is arranged parallel to the support rod; the nut is threadedly engaged with the fine-tuning screw, the slide is fixed on the nut, the support rod is connected to the slide, and the slide can move on the base along the length direction of the support rod.

[0010] Furthermore, a first accommodating chamber, four second accommodating chambers and four guide slide holes are provided in the base, the end face gear plate and four driven gears are all provided in the first accommodating chamber, and each of the second accommodating chambers is rotatably connected with a fine-tuning screw; the guide slide holes are connected to the second accommodating chambers in a one-to-one correspondence, and the slide seat is slidably fitted in the guide slide holes.

[0011] Furthermore, a guide protrusion is provided on the inner wall of the guide slide hole, and the guide protrusion extends along the length direction of the guide slide hole; a slide groove is provided on the slide seat, and the guide protrusion is slidably fitted in the slide groove.

[0012] Furthermore, it also includes a sleeve, which is fixed on the circumferential side wall of the base, each guide sliding hole is connected to a sleeve, and the support rod is slidably fitted in the sleeve.

[0013] Furthermore, a hand wheel is provided on the base, the hand wheel is coaxially connected with the end face gear plate through a rotating shaft, a plurality of levers are provided on the circumferential side wall of the hand wheel, and a prism is arranged on the top of the hand wheel.

[0014] Further, the locking assembly includes an adjusting screw rod, which is connected to the positioning base in a vertically rotatable manner, and the adjusting screw rod includes an upper thread section and a lower thread section with opposite thread rotation directions from top to bottom;

[0015] The upper thread section has an upper locking column in threaded engagement with the upper thread section, and the lower thread section has a lower locking column in threaded engagement with the lower thread section; the upper locking column and the lower locking column are respectively provided with locking surfaces conforming to the outer peripheral wall of the support rod on one side facing the support rod;

[0016] It also includes a rotation-stop assembly arranged in the positioning base, and the upper locking column and the lower locking column are respectively connected to a rotation-stop assembly, and the rotation-stop assembly is used to prevent the upper locking column and the lower locking column from rotating in the positioning base.

[0017] Furthermore, the anti-rotation assembly includes a anti-rotation block and a slide groove, and the anti-rotation block is respectively provided on the upper locking column and the lower locking column; the slide groove is opened in the positioning base, the slide groove is arranged vertically, and the anti-rotation block is slidably fitted in the slide groove.

[0018] Furthermore, the positioning base is provided with a through hole and a groove, the cross sections of the through hole and the groove are both circular, the through hole is connected with the groove, the central axis of the through hole is arranged in the horizontal direction, and the central axis of the groove is arranged in the vertical direction;

[0019] The support rod is slidably matched in the through hole, the adjusting screw rod is rotationally connected in the groove, the upper locking column and the lower locking column are conformably matched in the groove, and the sliding groove is arranged on the inner wall of the groove.

[0020] The beneficial effects of the present invention are:

[0021] The invention discloses a pile foundation center positioning bracket. When positioning the pile foundation center, first loosen the locking component, adjust the position of the positioning base on the support rod, and by aligning the clamping surface with the scale line on the support rod, according to the outer diameter size of the steel casing, the four positioning bases can be quickly slid to the same scale, and then tighten the locking component to lock the positioning base on the support rod, and first determine the distance between the clamping surface and the end face gear plate.

[0022] After four support rods are supported at the horizontal pile opening, the end face gear plate is rotated so that the end face gear plate synchronously drives the four sliding components to move along the radial direction of the end face gear plate. The sliding components drive the corresponding support rods to make slight telescopic adjustments, so that the clamping surface of each positioning base is clamped on the outer wall of the steel casing, so that the center of the end face gear plate is accurately located at the center of the pile opening, and the location of the pile foundation center is intuitively reflected through the prism. The positioning bracket has a simple structure, high pile foundation center positioning accuracy, is easy to operate on the construction site, and improves construction efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0024] Figure 1 It is a structural schematic diagram of a pile foundation center positioning bracket supported on a steel casing according to the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 is a cross-sectional schematic diagram of the base;

[0027] Figure 4 is a cross-sectional schematic diagram of the bottom of the base;

[0028] Figure 5 It is a structural schematic diagram of the positioning mechanism;

[0029] Figure 6 It is a schematic diagram of the structure of the upper locking column and the lower locking column.

[0030] Reference numerals:

[0031] 1-support rod, 2-positioning mechanism, 21-positioning base, 211-clamping surface, 212-through hole, 213-groove, 22-locking assembly, 221-adjusting screw, 222-upper locking column, 223-lower locking column, 224-locking surface, 23-stop assembly, 231-stop block, 232-slide groove, 3-base, 31-first accommodating chamber, 32-second accommodating chamber, 33-guide slide hole, 34-guide protrusion, 4-telescopic fine-tuning mechanism, 41-end gear plate, 42-sliding assembly, 421-driven gear, 422-fine-tuning screw, 423-nut, 424-slide, 5-prism, 6-sleeve, 7-handwheel, 71-dial rod, 8-steel casing. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the embodiments.

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] See also Figure 1 and Figure 2 , is a pile foundation center positioning bracket of the present invention, the positioning bracket includes a support rod 1, a positioning mechanism 2, a base 3 and a telescopic fine-tuning mechanism 4; the support rod 1 is provided with a scale line, the positioning mechanism 2 includes a positioning base 21 and a locking assembly 22, the positioning base 21 is slidably matched on the support rod 1, and the central axis of the support rod 1 is perpendicular to the central line of the length direction of the positioning base 21; the locking assembly 22 is installed in the positioning base 21, and the locking assembly 22 is used to lock the positioning base 21 on the support rod 1; a prism 5 is provided on the base 3, and the telescopic fine-tuning mechanism 4 includes an end face gear plate 41 and a sliding assembly 42, the end face gear plate 41 is rotatably connected to the base 3, and the prism 5 is coaxially arranged with the end face gear plate 41; the sliding assembly 42 is slidably matched on the base 3, and the four sliding assemblies 42 are arranged in a ring array along the central axis of the end face gear plate 41, and the sliding assembly 42 is meshed with the end face gear plate 41, and the end face gear plate 41 synchronously drives the four sliding assemblies 42 to move along the radial direction of the end face gear plate 41; each sliding assembly 42 is connected to a support rod 1, and the central axes of the four support rods 1 are arranged in a cross shape; a clamping surface 211 is provided on the side of the positioning base 21 facing the sliding assembly 42, and the clamping surface 211 is perpendicular to the support rod 1.

[0035] The positioning bracket of the present invention includes four parts: a support rod 1, a positioning mechanism 2, a base 3 and a telescopic fine-adjustment mechanism 4, wherein the support rod 1 is used to be supported on the pile mouth of the pile foundation (i.e., the mouth of the steel casing 8), the positioning mechanism 2 can adjust the position on the support rod 1 according to the steel casing 8 of different sizes, and the base 3 and the telescopic fine-adjustment mechanism 4 fine-tune the moving distance of the support rod 1 in the horizontal direction.

[0036] Specifically, when locating the center of the pile foundation, first loosen the locking assembly 22, adjust the position of the positioning base 21 on the support rod 1, and by aligning the clamping surface 211 with the scale line on the support rod 1, according to the outer diameter of the steel casing 8, the four positioning bases 21 can be quickly slid to the same scale, and then tighten the locking assembly 22 to lock the positioning base 21 on the support rod 1, and first determine the spacing between the clamping surface 211 and the end gear plate 41. At this time, the scale reading may have a certain error with the radius of the outer peripheral wall of the steel casing 8, so by loosening and tightening the locking assembly 22, the position of the positioning base 21 on the support rod 1 can be quickly and roughly adjusted.

[0037] The central axis of the end face gear plate 41 is located at the center where the central axes of the four support rods 1 are connected. When the four support rods 1 are supported at the horizontal pile opening, there is a certain distance between the clamping surface 211 and the outer wall of the steel casing 8. At this time, the center of the steel casing 8 cannot be determined. By rotating the end face gear plate 41, the end face gear plate 41 synchronously drives the four sliding components 42 to move along the radial direction of the end face gear plate 41. Since each sliding component 42 is connected to a support rod 1, the sliding component 42 drives the corresponding support rod 1 to perform a slight telescopic adjustment along the radial direction of the steel casing 8. In this way, the clamping surface 211 of each positioning base 21 can be clamped on the outer wall of the steel casing 8. Since the end face gear plate 41 synchronously drives the four sliding components 42 to move the same distance, the moving distances of the four support rods 1 are also the same, so that the center of the end face gear plate 41 is accurately located at the center of the pile opening, and the location of the pile center is intuitively reflected through the prism 5. The positioning bracket has a simple structure and high pile foundation center positioning accuracy, which is convenient for operation at the construction site and improves construction efficiency and safety.

[0038] See also Figure 3 and Figure 4 In a specific embodiment, the sliding assembly 42 includes a driven gear 421, a fine-tuning screw 422, a nut 423 and a slide 424; the driven gear 421 is meshed with the end gear plate 41, the fine-tuning screw 422 is rotatably connected to the base 3, the fine-tuning screw 422 is coaxially connected to the driven gear 421, and the fine-tuning screw 422 is arranged parallel to the support rod 1; the nut 423 is threadedly engaged with the fine-tuning screw 422, the slide 424 is fixed on the nut 423, the support rod 1 is connected to the slide 424, and the slide 424 can move on the base 3 along the length direction of the support rod 1.

[0039] When the end gear plate 41 is rotated, the end gear plate 41 will simultaneously drive the four driven gears 421 to rotate, and each driven gear 421 will drive the fine adjustment screw 422 connected thereto to rotate. Since a slide 424 is fixed on the nut 423, and the slide 424 is restricted on the base 3 and can only move along the length direction of the support rod 1, the rotation of the fine adjustment screw 422 will drive the slide 424 to move away from or close to the central axis of the end gear plate 41, so that the displacement of the support rod 1 along the radial direction of the steel casing 8 can be slightly adjusted.

[0040] In a specific embodiment, a first accommodating chamber 31, four second accommodating chambers 32 and four guide slide holes 33 are provided in the base 3; the end face gear plate 41 and the four driven gears 421 are all provided in the first accommodating chamber 31; a fine-tuning screw rod 422 is rotatably connected in each second accommodating chamber 32; the guide slide holes 33 are connected to the second accommodating chambers 32 in a one-to-one correspondence, and the slide seat 424 is slidably fitted in the guide slide hole 33.

[0041] In this embodiment, the base 3 is cylindrical, the central axis of the end face gear plate 41 is coaxially arranged with the central axis of the base 3, the four second accommodating cavities 32 and the four guide slide holes 33 are arranged in a circular array along the central axis of the base 3, wherein the guide slide holes 33 are located above the corresponding second accommodating cavities 32.

[0042] In a specific embodiment, a guide protrusion 34 is provided on the inner wall of the guide slide hole 33 , and the guide protrusion 34 extends along the length direction of the guide slide hole 33 ; a slide groove 232 is provided on the slide seat 424 , and the guide protrusion 34 is slidably fitted in the slide groove 232 .

[0043] See also Figure 5 and Figure 6 In a specific embodiment, it further includes a sleeve 6, which is fixed on the circumferential side wall of the base 3, and each guide slide hole 33 is connected with a sleeve 6, and the support rod 1 is slidably fitted in the sleeve 6. The sleeve 6 is fixed on the outer peripheral wall of the base 3, and the sleeve 6 is connected to the guide slide hole 33. Since one end of the support rod 1 is connected to the slide seat 424, when the support rod 1 is supported on the horizontal pile foundation, the connection between the support rod 1 and the slide seat 424 will bear the weight of the entire base 3 and the sliding assembly 42. Therefore, by setting the sleeve 6, a certain supporting and protective effect can be played on the support rod 1, reducing the force at the connection between the support rod 1 and the slide seat 424, preventing the support rod 1 from bending, and avoiding affecting the positioning accuracy.

[0044] In a specific embodiment, a hand wheel 7 is provided on the base 3, and the hand wheel 7 is coaxially connected to the end face gear plate 41 through a rotating shaft, and a plurality of levers 71 are provided on the circumferential side wall of the hand wheel 7, and the prism 5 is provided on the top of the hand wheel 7. When the support rod 1 is supported on the horizontal pile foundation, the hand wheel 7 is rotated by the lever 71 to drive the end face gear plate 41 to rotate, thereby slightly adjusting the displacement of the support rod 1 in the radial direction of the steel casing 8, so as to facilitate the fast clamping surface 211 to be clamped on the outer wall of the steel casing 8, thereby quickly centering.

[0045] In a specific embodiment, the locking assembly 22 includes an adjusting screw rod 221, which is connected to the positioning base 21 along the vertical rotation. The adjusting screw rod 221 includes an upper threaded section and a lower threaded section with opposite thread rotation directions from top to bottom; the upper threaded section is threaded with an upper locking column 222, and the lower threaded section is threaded with a lower locking column 223; the upper locking column 222 and the lower locking column 223 are respectively provided with locking surfaces 224 that conform to the outer peripheral wall of the support rod 1 on the side facing the support rod 1; it also includes a stop rotation assembly 23 arranged in the positioning base 21, the upper locking column 222 and the lower locking column 223 are respectively connected with a stop rotation assembly 23, and the stop rotation assembly 23 is used to prevent the upper locking column 222 and the lower locking column 223 from rotating in the positioning base 21.

[0046] Since the adjusting screw rod 221 is rotatably connected in the positioning base 21, and the upper locking column 222 and the lower locking column 223 are respectively connected to a rotation-stopping assembly 23, when the adjusting screw rod 221 is rotated, the upper locking column 222 on the upper threaded section and the lower locking column 223 on the lower threaded section will move closer to or farther from each other. The upper locking column 222 and the lower locking column 223 are respectively provided with arc-shaped locking surfaces 224 that conform to the outer peripheral wall of the support rod 1 on one side facing the support rod 1. When the upper locking column 222 and the lower locking column 223 move closer to each other, the two locking surfaces 224 will be locked on the outer wall of the support rod 1, so that the positioning base 21 can be locked on the support rod 1. When the upper locking column 222 and the lower locking column 223 move away from each other, the two locking surfaces 224 will be separated from the outer wall of the support rod 1, so that the positioning base 21 can be slid on the support rod 1.

[0047] In a specific embodiment, the anti-rotation assembly 23 includes a anti-rotation block 231 and a slide groove 232. A anti-rotation block 231 is respectively provided on the upper locking column 222 and the lower locking column 223; the slide groove 232 is opened in the positioning base 21, and the slide groove 232 is arranged vertically, and the anti-rotation block 231 slides in the slide groove 232.

[0048] When the adjusting screw rod 221 is rotated, the upper locking column 222 and the lower locking column 223 may rotate driven by the adjusting screw rod 221. Therefore, by setting the stop block 231 and the slide groove 232, since the stop block 231 is restricted in the slide groove 232, the upper locking column 222 and the lower locking column 223 can only move along the length direction of the slide groove 232 (which can also be expressed as the height direction of the base), so that the upper locking column 222 on the upper threaded section and the lower locking column 223 on the lower threaded section move closer to or away from each other, so as to loosely match the positioning base 21 with the support rod 1.

[0049] In a specific embodiment, a through hole 212 and a groove 213 are provided on the positioning base 21, and the cross-sections of the through hole 212 and the groove 213 are both circular. The through hole 212 is connected to the groove 213, and the central axis of the through hole 212 is arranged in the horizontal direction, and the central axis of the groove 213 is arranged in the vertical direction; the support rod 1 is slidably fitted in the through hole 212, the adjusting screw rod 221 is rotatably connected in the groove 213, the upper locking column 222 and the lower locking column 223 are conformally fitted in the groove 213, and the slide groove 232 is arranged on the inner wall of the groove 213.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A pile foundation center positioning bracket, characterized in that: It includes a support rod, a positioning mechanism, a base and a telescopic fine-adjustment mechanism; The support rod is provided with scale lines, and the positioning mechanism includes a positioning base and a locking assembly. The positioning base is slidably fitted on the support rod, and the central axis of the support rod is perpendicular to the central line of the length direction of the positioning base; the locking assembly is installed in the positioning base, and the locking assembly is used to lock the positioning base on the support rod; The base is provided with a prism, the telescopic fine-tuning mechanism comprises an end face gear plate and a sliding assembly, the end face gear plate is rotatably connected to the base, and the prism is coaxially arranged with the end face gear plate; The sliding assembly is slidably matched on the base, and the four sliding assemblies are arranged in a ring array along the central axis of the end face gear plate. The sliding assembly is meshed with the end face gear plate, and the end face gear plate synchronously drives the four sliding assemblies to move along the radial direction of the end face gear plate; each sliding assembly is connected to a support rod, and the central axes of the four support rods are arranged in a cross shape; a clamping surface is provided on the side of the positioning base facing the sliding assembly, and the clamping surface is arranged perpendicular to the support rod; The sliding assembly includes a driven gear, a fine-tuning screw, a nut and a slide seat; the driven gear is meshed with the end face gear plate, the fine-tuning screw is rotatably connected to the base, the fine-tuning screw is coaxially connected to the driven gear, and the fine-tuning screw is arranged in parallel with the support rod; the nut is threadedly engaged with the fine-tuning screw, the slide seat is fixed on the nut, the support rod is connected to the slide seat, and the slide seat can move on the base along the length direction of the support rod; The locking assembly comprises an adjusting screw rod, which is connected to the positioning base in a vertical rotation manner, and the adjusting screw rod comprises an upper thread section and a lower thread section with opposite thread rotation directions from top to bottom; The upper thread section has an upper locking column in threaded engagement with the upper thread section, and the lower thread section has a lower locking column in threaded engagement with the lower thread section; the upper locking column and the lower locking column are respectively provided with locking surfaces conforming to the outer peripheral wall of the support rod on one side facing the support rod; It also includes a rotation-stop assembly arranged in the positioning base, the upper locking column and the lower locking column are respectively connected to a rotation-stop assembly, and the rotation-stop assembly is used to prevent the upper locking column and the lower locking column from rotating in the positioning base; The anti-rotation assembly includes an anti-rotation block and a slide groove, and the anti-rotation block is respectively provided on the upper locking column and the lower locking column; the slide groove is opened in the positioning base, the slide groove is arranged vertically, and the anti-rotation block is slidably matched in the slide groove; The base is cylindrical, and the central axis of the end face gear disc is coaxially arranged with the central axis of the base.

2. The pile foundation center positioning bracket according to claim 1, characterized in that: The base is provided with a first accommodating chamber, four second accommodating chambers and four guide slide holes. The end gear plate and four driven gears are all arranged in the first accommodating chamber. A fine-tuning screw rod is rotatably connected in each of the second accommodating chambers. The guide slide holes are connected to the second accommodating chambers in a one-to-one correspondence, and the slide seat is slidably fitted in the guide slide holes.

3. The pile foundation center positioning bracket according to claim 2, characterized in that: The inner wall of the guide sliding hole is provided with a guide protrusion, and the guide protrusion extends along the length direction of the guide sliding hole; the sliding seat is provided with a sliding groove, and the guide protrusion is slidably fitted in the sliding groove.

4. The pile foundation center positioning bracket according to claim 3, characterized in that: It also includes a sleeve, which is fixed on the circumferential side wall of the base, each guide sliding hole is connected with a sleeve, and the support rod is slidably matched in the sleeve.

5. The pile foundation center positioning bracket according to claim 4, characterized in that: A hand wheel is arranged on the base, and the hand wheel is coaxially connected with the end face gear plate through a rotating shaft. A plurality of levers are arranged on the circumferential side wall of the hand wheel, and a prism is arranged on the top of the hand wheel.

6. The pile foundation center positioning bracket according to claim 1, characterized in that: The positioning base is provided with a through hole and a groove, the cross sections of the through hole and the groove are both circular, the through hole is connected with the groove, the central axis of the through hole is arranged in the horizontal direction, and the central axis of the groove is arranged in the vertical direction; The support rod is slidably matched in the through hole, the adjusting screw rod is rotationally connected in the groove, the upper locking column and the lower locking column are conformably matched in the groove, and the sliding groove is arranged on the inner wall of the groove.

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