Screw box

Abstract

The invention relates to a screw box which comprises a cam mechanism and a screw assembly, the cam mechanism is fixedly arranged, and the cam mechanism is provided with a first contour surface and a second contour surface; the screw assembly comprises a rotatably arranged screw disc and a plurality of screw box bodies with upper openings; the multiple screw box bodies are all arranged on the screw disc and arranged in the circumferential direction of the screw disc at intervals. Screw box covers are hinged to openings of the plurality of screw box bodies; a connecting rod component is arranged between each screw box cover and the cam mechanism; one end of the connecting rod component is connected with the screw box cover, and when the other end of the connecting rod component is in follow-up fit with the first contour surface, the screw box cover is in an open state; when the other end of the connecting rod component is in follow-up fit with the second contour surface, the screw box cover is in a closed state; the screw box cover is in the open state only at the corresponding position, the risk that screws are taken by mistake is greatly avoided, and the locking efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of screw locking, and in particular to a screw box. Background Art

[0002] When assembling products, screws are usually used for assembly. In order to meet production needs and production efficiency, more and more industries are beginning to use screw locking machines to complete screw locking operations.

[0003] In the related art, the openings of the multiple screw box bodies on the screw locking machine are generally open, which easily leads to the risk of taking the wrong screws, resulting in low locking efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a screw box that greatly avoids the risk of taking the wrong screws and can improve the locking efficiency.

[0005] A screw box, comprising:

[0006] A cam mechanism, the cam mechanism is fixedly arranged, and the cam mechanism has a first contour surface and a second contour surface;

[0007] The screw assembly comprises a screw plate and a plurality of screw box bodies with upper openings, wherein the screw plate can be rotatably arranged; the plurality of screw box bodies are arranged on the screw plate and are arranged at intervals along the circumference of the screw plate; the openings of the plurality of screw box bodies are hinged with screw box covers; and a connecting rod member is arranged between each screw box cover and the cam mechanism;

[0008] One end of the connecting rod component is connected to the screw box cover, and the other end of the connecting rod component forms a follow-up fit with the first contour surface or the second contour surface.

[0009] In one embodiment, the screw box also includes a limit cover, which is arranged on the periphery of the cam mechanism, and a guide groove is formed between the limit cover and the first contour surface and the second contour surface, and the end of the connecting rod member away from the screw box cover is rotatably connected to the guide groove.

[0010] In one embodiment, the connecting rod assembly includes a first connecting rod, a second connecting rod, a third connecting rod and a connecting piece, the connecting piece is movably connected to the guide groove, and one end of the first connecting rod is connected to the connecting piece, the other end of the first connecting rod is hinged to one end of the second connecting rod and the third connecting rod respectively, one end of the second connecting rod away from the first connecting rod is hinged to the screw box cover, and one end of the third connecting rod away from the first connecting rod is hinged to the screw box body.

[0011] In one embodiment, a rotating portion is formed at one end of the first connecting rod close to the connecting member, and the rotating portion is movably connected in the guide groove. An arc-shaped protrusion abutting against the first contour surface, the second contour surface and the inner wall of the limiting cover is provided on the outer wall of the rotating portion.

[0012] In one embodiment, a mounting portion is provided at one end of the first connecting rod away from the connecting member, and the second connecting rod and the third connecting rod are respectively connected to two opposite ends of the mounting portion.

[0013] In one embodiment, the contact surfaces between the connecting member and the first contour surface, the second contour surface and the inner side wall of the limiting cover are arc-shaped.

[0014] In one embodiment, the first contour surface includes a first opening segment, a highest opening segment and a second opening segment; the second contour surface includes a closed base circle segment, and the closed base circle segment, the first opening segment, the highest opening segment and the second opening segment are sequentially connected along the circumference of the cam mechanism to form a circle.

[0015] In one embodiment, the center of the closed base circle segment and the center of the open highest segment are on the same straight line.

[0016] In one of the embodiments, the first opening section and the second opening section are symmetrically arranged with respect to the highest opening section.

[0017] In one embodiment, the distance between the first opening section and the axial center of the cam mechanism gradually decreases in the counterclockwise direction, and the distance between the second opening section and the axial center of the cam mechanism gradually increases in the counterclockwise direction.

[0018] In one embodiment, the cam mechanism has an opening start position and a closing start position, the opening start position is located at the intersection of the first opening segment and the closed base circle segment, and the closing start position is located at the intersection of the second opening segment and the closed base circle segment.

[0019] In one embodiment, the rotation center of the screw disk and the axial center of the cam mechanism are on the same straight line.

[0020] In one embodiment, the screw assembly further includes a driving member, which is drivingly connected to the screw disk.

[0021] In one embodiment, the screw box body is detachably connected to the screw plate.

[0022] In one embodiment, the screw box body is fan-shaped as a whole.

[0023] In the above scheme, by rotating the screw disk, the screw box body and the connecting rod member can be driven to rotate at the same time. Since the cam mechanism is fixed, when the other end of the connecting rod member moves to the first contour surface, the other end of the connecting rod member forms a follow-up fit with the first contour surface, so that the screw box cover is in an open state; when the other end of the connecting rod member moves to the second contour surface, the other end of the connecting rod member forms a follow-up fit with the second contour surface, so that the screw box cover is in a closed state; the screw box cover in the present application is only in an open state at the corresponding position, which greatly avoids the risk of taking the wrong screws and can improve the locking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the structure of a screw box shown in an embodiment of the present application.

[0027] Figure 2 This is a partial structural schematic diagram of a screw box in a closed state shown in an embodiment of the present application.

[0028] Figure 3 This is a partial structural schematic diagram of a screw box in an open state shown in an embodiment of the present application.

[0029] Figure 4 It is a cross-sectional structural diagram of a cam mechanism, a first connecting rod and a connecting member shown in an embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the structure of a rod shown in an embodiment of the present application.

[0031] Reference numerals:

[0032] 10. Screw box; 100. Cam mechanism; 110. First opening section; 120. Open highest section; 130. Second opening section; 140. Closed base circle section; 200. Screw assembly; 210. Screw box body; 211. Placement slot; 220. Screw box cover; 300. Connecting rod member; 310. First connecting rod; 311. Rotating part; 312. Mounting part; 320. Second connecting rod; 330. Third connecting rod; 340. Connecting piece; 350. Arc-shaped protrusion; 400. Limiting cover; 410. Guide slot. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] When assembling products, screws are usually used for assembly. In order to meet production needs and production efficiency, more and more industries are beginning to use screw locking machines to complete screw locking operations.

[0040] In the related art, the openings of the multiple screw box bodies on the screw locking machine are generally open, which easily leads to the risk of taking the wrong screws, resulting in low locking efficiency.

[0041] To solve the above problems, see Figure 1 , an embodiment of the present application relates to a screw box 10, which is configured on a screw machine.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4The screw box 10 includes a cam mechanism 100 and a screw assembly 200. The cam mechanism 100 is fixed. The screw assembly 200 includes a screw plate and a plurality of screw box bodies 210 with an upper opening. The screw plate can be rotatably arranged. The plurality of screw box bodies 210 are all arranged on the screw plate and are arranged at intervals along the circumference of the screw plate. The openings of the plurality of screw box bodies 210 are all hinged with screw box covers 220, and the screw box covers 220 can be flipped relative to the screw box bodies 210.

[0043] Specifically, the cam mechanism 100 is fixedly arranged on the screw machine. The screw disk can be rotatably arranged on the screw machine. It should be noted that: the present application does not limit the number of screw box bodies 210, which can be set according to actual use requirements. In this embodiment, the number of screw box bodies 210 is three. In other embodiments, the number of screw box bodies 210 is four, five or even more.

[0044] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The cam mechanism 100 has a first contour surface and a second contour surface. A connecting rod member 300 is disposed between each screw box cover 220 and the cam mechanism 100, and one end of the connecting rod member 300 is connected to the screw box cover 220. The other end of the connecting rod member 300 forms a follow-up fit with the first contour surface or the second contour surface to drive the connecting rod member 300 to move, thereby opening or closing the screw box cover 220.

[0045] When the other end of the connecting rod member 300 forms a follow-up fit with the first contour surface, the screw box cover 220 is in an open state under the action of the connecting rod member 300. When the other end of the connecting rod member 300 forms a follow-up fit with the second contour surface, the screw box cover 220 is in a closed state under the action of the connecting rod member 300.

[0046] By rotating the screw disk, the screw box body 210 and the connecting rod member 300 can be driven to rotate simultaneously. Since the cam mechanism 100 is fixedly arranged, when the other end of the connecting rod member 300 moves to the first contour surface, the other end of the connecting rod member 300 forms a follow-up match with the first contour surface, so that the screw box cover 220 is in an open state. When the other end of the connecting rod member 300 moves to the second contour surface, the other end of the connecting rod member 300 forms a follow-up match with the second contour surface, so that the screw box cover 220 is in a closed state. The screw box cover 220 in the present application is only in an open state at the corresponding position, which greatly avoids the risk of taking the wrong screw and can improve the locking efficiency.

[0047] It should be noted that: the present application does not limit the specific positions of the first contour surface and the second contour surface, which can be set according to actual use requirements. Specifically, the first contour surface can be set in the set open position.

[0048] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the screw box 10 also includes a limit cover 400, which is arranged on the periphery of the cam mechanism 100, and a guide groove 410 is formed between the limit cover 400 and the first contour surface and the second contour surface, and the end of the connecting rod member 300 away from the screw box cover 220 is rotatably connected to the guide groove 410.

[0049] Specifically, the limiting cover 400 is fixedly arranged on the screw machine. The first contour surface and the second contour surface are both formed on the outer side wall of the cam mechanism 100. The limiting cover 400 includes a top and a side wall, and the side wall of the limiting cover 400 is arranged on the outer side of the side wall of the cam mechanism 100. A guide groove 410 is formed between the inner side wall of the limiting cover 400 and the outer side wall of the cam mechanism 100.

[0050] By providing the guide groove 410 , the movement of one end of the connecting rod member 300 away from the screw box cover 220 can be limited to prevent the connecting rod member 300 from deviating during the movement, thereby ensuring the stability of the opening and closing of the screw box cover 220 .

[0051] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the connecting rod member 300 includes a first connecting rod 310, a second connecting rod 320, a third connecting rod 330 and a connecting member 340, the connecting member 340 is movably connected to the guide groove 410, and one end of the first connecting rod 310 is connected to the connecting member 340.

[0052] The other end of the first connecting rod 310 is hinged to one end of the second connecting rod 320 and the third connecting rod 330 respectively, and the second connecting rod 320 and the third connecting rod 330 are rotatable relative to the first connecting rod 310. The end of the second connecting rod 320 away from the first connecting rod 310 is hinged to the screw box cover 220, and the second connecting rod 320 is rotatable relative to the screw box cover 220. The end of the third connecting rod 330 away from the first connecting rod 310 is hinged to the screw box body 210, and the second connecting rod 320 is rotatable relative to the screw box body 210. The first connecting rod 310, the second connecting rod 320 and the third connecting rod 330 cooperate with each other to open or close the screw box cover 220.

[0053] Specifically, the contact surface between the connecting member 340 and the first contour surface, the second contour surface and the inner wall of the limiting cover 400 is arc-shaped, which can reduce the friction between the connecting member 340 and the first contour surface, the second contour surface and the inner wall of the limiting cover 400, thereby ensuring the efficient operation of the first connecting rod 310.

[0054] See also Figure 2 , Figure 3 and Figure 5 According to some embodiments of the present application, optionally, a rotating portion 311 is formed at one end of the first connecting rod 310 close to the connecting member 340, and the rotating portion 311 is movably connected to the guide groove 410. An arc-shaped protrusion 350 is provided on the outer wall of the rotating portion 311 to abut against the first contour surface, the second contour surface and the inner wall of the limiting cover 400. Specifically, the arc-shaped protrusion 350 is an arc-shaped structure.

[0055] By providing the arc-shaped protrusion 350, the friction between the rotating part 311 and the first contour surface, the second contour surface and the inner wall of the limiting cover 400 can be reduced, thereby ensuring the efficient operation of the first connecting rod 310 and further ensuring the stable operation of the screw box cover 220 during the opening and closing processes.

[0056] See also Figure 2 , Figure 3 and Figure 5 According to some embodiments of the present application, optionally, a mounting portion 312 is provided at one end of the first connecting rod 310 away from the connecting member 340, and the second connecting rod 320 and the third connecting rod 330 are respectively connected to two opposite ends of the mounting portion 312. Specifically, the second connecting rod 320 and the third connecting rod 330 are respectively hinged to two opposite ends of the mounting portion 312.

[0057] More specifically, a through hole is formed on the mounting portion 312 , a hinge shaft is passed through the through hole, and the second connecting rod 320 and the third connecting rod 330 are hinged on the hinge shaft respectively.

[0058] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the first contour surface includes a first opening segment 110, an opening highest segment 120, and a second opening segment 130. The second contour surface includes a closed base circle segment 140, and the closed base circle segment 140, the first opening segment 110, the opening highest segment 120, and the second opening segment 130 are sequentially connected along the circumference of the cam mechanism 100 to form a circle.

[0059] Specifically, the center of the closed base circle segment 140 and the center of the open highest segment 120 are on the same straight line.

[0060] When the other end of the first connecting rod 310 and the connecting member 340 move to the closed base circle section 140, the screw box cover 220 is in a closed state. When the other end of the first connecting rod 310 and the connecting member 340 move to the first opening section 110 and the second opening section 130, the screw box cover 220 is in an open state. When the other end of the first connecting rod 310 and the connecting member 340 move to the highest opening section 120, the screw box cover 220 is opened to the maximum state.

[0061] See also Figure 4 According to some embodiments of the present application, optionally, the first opening section 110 and the second opening section 130 are symmetrically arranged with respect to the highest opening section 120 .

[0062] Specifically, the distance between the first opening section 110 and the axial center of the cam mechanism 100 gradually decreases in the clockwise direction, and the distance between the second opening section 130 and the axial center of the cam mechanism 100 gradually increases in the clockwise direction.

[0063] By symmetrically arranging the first opening section 110 and the second opening section 130, and gradually reducing the distance between the first opening section 110 and the axial center of the cam mechanism 100 in the clockwise direction, and gradually increasing the distance between the second opening section 130 and the axial center of the cam mechanism 100 in the clockwise direction, the speed of the screw box cover 220 can be consistent during the opening process and the closing process.

[0064] See also Figure 4 According to some embodiments of the present application, optionally, the cam mechanism 100 has an open starting position and a closed starting position, the open starting position is located at the intersection of the first open segment 110 and the closed base circle segment 140, and the closed starting position is located at the intersection of the second open segment 130 and the closed base circle segment 140.

[0065] When the other end of the first connecting rod 310 and the connecting member 340 are located at the opening start position or the closing start position, the screw box cover 220 is in the closed state. When the other end of the first connecting rod 310 and the connecting member 340 move from the opening start position through the first opening section 110 to the opening highest section 120, the screw box cover 220 switches from the closed state to the open state. When the other end of the first connecting rod 310 and the connecting member 340 move from the opening highest section 120 through the second opening section 130 to the closing start position, the screw box cover 220 switches from the open state to the closed state.

[0066] See also Figure 1 , Figure 2 and Figure 4According to some embodiments of the present application, optionally, the rotation center of the screw disk and the axial center of the cam mechanism 100 are on the same straight line, which can ensure the stability of the rotation of the screw disk, and further ensure the rotation stability of the other end of the first connecting rod 310 and the connecting member 340 relative to the cam mechanism 100.

[0067] See also Figure 1 According to some embodiments of the present application, the screw assembly 200 may further include a driving member, which is in driving connection with the screw disk and is used to drive the screw disk to rotate. Specifically, the driving member is disposed below the screw disk, and a power output end of the driving member is in driving connection with the screw disk. More specifically, the driving member is a driving motor.

[0068] See also Figure 1 According to some embodiments of the present application, optionally, the screw box body 210 is detachably connected to the screw plate. Exemplarily, the screw box body 210 is snap-connected to the screw plate.

[0069] By detachably connecting the screw box body 210 to the screw plate, the screw box body 210 can be quickly disassembled and assembled.

[0070] See also Figure 1 and Figure 3 According to some embodiments of the present application, optionally, the screw box body 210 is fan-shaped as a whole. In other embodiments, the screw box body 210 can also be triangular, rectangular or other polygonal structures as a whole.

[0071] See also Figure 1 and Figure 3 According to some embodiments of the present application, optionally, a placement slot 211 for placing screws is provided on the screw box body 210. Specifically, the placement slots 211 on each screw box body 210 can be set to different specifications. The placement slots 211 on the same screw box body 210 have the same specifications.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A screw box, characterized in that: include: A cam mechanism, wherein the cam mechanism is fixedly arranged and has a first contour surface and a second contour surface; A screw assembly, comprising a screw disk and a plurality of screw box bodies with upper openings, wherein the screw disk is rotatably arranged; a plurality of screw box bodies are arranged on the screw disk and are arranged at intervals along the circumference of the screw disk; a screw box cover is hinged at the opening of a plurality of screw box bodies; a connecting rod member is arranged between each screw box cover and the cam mechanism; One end of the connecting rod member is connected to the screw box cover, and the other end of the connecting rod member forms a follow-up fit with the first contour surface or the second contour surface.

2. The screw box according to claim 1, characterized in that: The screw box also includes a limit cover, which is arranged on the periphery of the cam mechanism, and a guide groove is formed between the limit cover and the first contour surface and the second contour surface, and the end of the connecting rod member away from the screw box cover is rotatably connected to the guide groove.

3. The screw box according to claim 2, characterized in that: The connecting rod assembly includes a first connecting rod, a second connecting rod, a third connecting rod and a connecting piece, the connecting piece is movably connected to the guide groove, and one end of the first connecting rod is connected to the connecting piece, the other end of the first connecting rod is hinged to one end of the second connecting rod and the third connecting rod respectively, one end of the second connecting rod away from the first connecting rod is hinged to the screw box cover, and one end of the third connecting rod away from the first connecting rod is hinged to the screw box body.

4. The screw box according to claim 3, characterized in that: A rotating part is formed at one end of the first connecting rod close to the connecting member, and the rotating part is movably connected in the guide groove. An arc-shaped protrusion abutting against the first contour surface, the second contour surface and the inner side wall of the limiting cover is provided on the outer side wall of the rotating part.

5. The screw box according to claim 3, characterized in that: A mounting portion is provided at one end of the first connecting rod away from the connecting member, and the second connecting rod and the third connecting rod are respectively connected to two opposite ends of the mounting portion.

6. The screw box according to claim 3, characterized in that: The contact surfaces between the connecting member and the first contour surface, the second contour surface and the inner side wall of the limiting cover are arc-shaped.

7. The screw box according to claim 1, characterized in that: The first contour surface includes a first opening segment, a highest opening segment and a second opening segment; the second contour surface includes a closed base circle segment, and the closed base circle segment, the first opening segment, the highest opening segment and the second opening segment are sequentially connected along the circumference of the cam mechanism to form a circle.

8. The screw box according to claim 7, characterized in that: The center of the closed base circle segment and the center of the open highest segment are on the same straight line.

9. The screw box according to claim 7, characterized in that: The first opening section and the second opening section are symmetrically arranged with respect to the highest opening section.

10. The screw box according to claim 7, characterized in that: The distance between the first opening section and the axial center of the cam mechanism gradually decreases in the counterclockwise direction, and the distance between the second opening section and the axial center of the cam mechanism gradually increases in the counterclockwise direction.

11. The screw box according to claim 7, characterized in that: The cam mechanism has an opening start position and a closing start position. The opening start position is located at the intersection of the first opening segment and the closed base circle segment, and the closing start position is located at the intersection of the second opening segment and the closed base circle segment.

12. The screw box according to any one of claims 1 to 7, characterized in that: The rotation center of the screw disk and the axial center of the cam mechanism are on the same straight line.

13. The screw box according to any one of claims 1 to 7, characterized in that: The screw assembly also includes a driving member, which is drivingly connected to the screw disk.

14. The screw box according to any one of claims 1 to 7, characterized in that: The screw box body is detachably connected to the screw disk.

15. The screw box according to claim 1, characterized in that: The screw box body is fan-shaped as a whole.

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