Self-recovery type rotating arm structure and instrument tray

Abstract

The utility model belongs to the technical field of dental medical apparatuses and instruments, and relates to a self-recovery type spiral arm structure which comprises a fixed arm, a spiral arm and at least one torsion spring. An integrally formed torsion spring seat is arranged at the end part of the fixed arm; the torsion spring seat is sleeved with the rotating arm, the rotating arm can rotate relative to the fixed arm, and a clamping groove is formed in the rotating arm; the torsion spring is arranged on the torsion spring seat, and a pin of the torsion spring penetrates through the torsion spring seat to extend towards one side of the rotating arm and then is fixed on the clamping groove. The utility model further relates to an instrument tray. According to the technical scheme, the internal structure arrangement of the instrument tray can be simplified, the effect of reducing the overall size and occupied space of the instrument tray is achieved, and the use experience of doctors is improved.

Description

Technical Field

[0001] The present application relates to the technical field of dental medical instruments, and more specifically, to a self-restoring rotary arm structure and an instrument tray. Background Art

[0002] The doctor unit of the dental comprehensive treatment machine is a common device used by dentists to place and use medical instruments. When performing dental surgery, the doctor pulls the mobile phone placed on the instrument tray into the patient's mouth and around the mouth for treatment.

[0003] There are two main ways to place the phone in a conventional doctor unit, namely, the bottom hanging type and the top hanging type. When the top hanging doctor unit is in use, the doctor needs to pull the rotating arm to stretch the operating phone and other medical devices to the vicinity of the patient's mouth, so that the doctor can perform surgery; the traditional top hanging doctor unit mostly uses a rear fixed form. When the phone tube is pulled, the rotating arm rotates up from the bottom of the instrument tray, thereby realizing the extension and retraction of the phone tube; when the phone tube is released, it uses a tension spring to realize the resetting of the rotating arm. Therefore, when installing the rotating arm of the existing doctor unit, it is necessary to open an avoidance hole on the instrument tray so that the rotating arm can rotate up from the bottom of the instrument tray, and install a support rotatably connected to the rotating arm and internal components such as a tension spring inside the instrument tray so that the rotating arm can rebound and reset, resulting in the overall structure of the existing instrument tray being complex and large in size, and the instrument tray occupying a large space. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the internal structure of the existing instrument tray is complicated, and the space and volume occupied are large, and the rotating arm needs to be rotated from the side away from the doctor to the top of the instrument tray, which is inconvenient for the doctor to use.

[0005] In order to solve the above technical problems, the utility model provides a self-restoring swing arm structure, which adopts the following technical solutions:

[0006] A self-restoring swing arm structure comprises a fixed arm, a swing arm and at least one torsion spring;

[0007] An integrally formed torsion spring seat is provided at the end of the fixed arm;

[0008] The swing arm is sleeved on the torsion spring seat, and the swing arm can rotate relative to the fixed arm, and a clamping groove is provided on the swing arm;

[0009] The torsion spring is installed on the torsion spring seat, and the pin of the torsion spring passes through the torsion spring seat and extends to one side of the rotary arm and is fixed on the clamping slot.

[0010] Furthermore, the self-restoring swing arm structure also includes a rotating shaft, which passes through the swing arm and the torsion spring seat, so that the swing arm is rotatably mounted on the fixed arm around the rotating shaft.

[0011] Furthermore, the outer circumferential surface of the rotating shaft is provided with knurling.

[0012] Furthermore, receiving grooves are provided on both sides of the torsion spring seat, and the torsion spring is a parallel double torsion spring;

[0013] The parallel double torsion spring includes a first spring body and a second spring body, which are respectively installed in the accommodating groove, wherein the pin of the first spring body is connected with the pin of the second spring body to form a U-shaped connecting part, and the U-shaped connecting part is fixedly installed on the card slot.

[0014] Furthermore, the self-restoring swing arm structure also includes a push rod switch assembly, and the push rod switch assembly includes a push rod and a base;

[0015] A guide groove is provided in the fixed arm with two ends passing through, and the push rod is movably installed in the guide groove, and one end of the push rod is exposed from the fixed arm;

[0016] The base is arranged at one end of the fixed arm away from the rotary arm, and a control switch is arranged on the base, and the control switch is located at one end of the guide groove away from the rotary arm;

[0017] At the pressure control section position of the moving track of the push rod, one end of the push rod is touched by the rotary arm, and the other end of the push rod presses the control switch.

[0018] Furthermore, the top rod switch assembly also includes an elastic reset member, which is installed between the top rod and the base;

[0019] At the reset section position of the movable track of the push rod, one end of the push rod extends out of the guide groove, and the other end of the push rod is pushed by the elastic reset member and moves away from the control switch.

[0020] Furthermore, the fixing arm is provided with a first through hole and a second through hole at both ends of the guide groove, and the apertures of the first through hole and the second through hole are both smaller than the groove diameter of the guide groove;

[0021] A first guide block and a second guide block with the same structure are respectively provided at both ends of the push rod. The first guide block and the second guide block both include a guide portion and a contact portion. The guide portion cooperates with the guide groove. The contact portion of the first guide block cooperates with the first through hole, and the contact portion of the second guide block cooperates with the second through hole.

[0022] Furthermore, the self-restoring swing arm structure also includes a roller, which is rotatably mounted on one end of the swing arm away from the fixed arm, and a groove is provided on the roller.

[0023] Furthermore, at least one reinforcing rib is provided between the fixed arm and the torsion spring seat, one end of the reinforcing rib is fixed to the fixed arm, and the other end is fixed to the torsion spring seat.

[0024] In order to solve the above technical problems, the utility model also provides an instrument tray, which adopts the following technical solution:

[0025] An instrument tray comprises a housing and at least one self-restoring rotary arm structure as described above;

[0026] At least one mounting groove is arranged on the shell, and the self-restoring swing arm structure is detachably mounted on the mounting groove.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The self-restoring swing arm structure provided by the utility model decomposes the swing arm of the traditional straight rod structure into a fixed arm and a swing arm which are rotatably connected, so that the swing arm structure assembled on the instrument tray itself has the function of swing arm rotation, so as to simplify the internal structure setting of the instrument tray, thereby achieving the effect of reducing the overall volume and occupied space of the instrument tray; at the same time, since the swing arm is rotatably arranged around the fixed arm, there is no need to set an avoidance hole on the instrument tray, and the swing arm structure can be installed in a position close to the doctor, thereby further reducing the space occupied by the instrument tray and facilitating the doctor's use; in addition, by setting a torsion spring between the fixed arm and the swing arm, when the doctor releases the mobile phone, the swing arm can have a self-restoring ability, thereby improving the doctor's user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the scheme of the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of the self-restoring swing arm structure of the utility model (without a base);

[0031] Figure 2 It is a structural explosion diagram of the self-restoring swing arm structure of the utility model;

[0032] Figure 3 It is a structural schematic diagram of the torsion spring of the utility model;

[0033] Figure 4 It is a structural schematic diagram of the instrument tray of the utility model in a first state;

[0034] Figure 5 About Figure 4 A schematic diagram of the structure at A;

[0035] Figure 6 It is a structural schematic diagram of the instrument tray of the utility model in the second state;

[0036] Figure 7 About Figure 6 Schematic diagram of the enlarged structure at B.

[0037] Reference numerals:

[0038] 10. Self-restoring swing arm structure; 20. Housing;

[0039] 1. Fixed arm; 11. Torsion spring seat; 111. First rotating shaft hole; 112. Accommodating groove; 12. Guide groove; 13. Reinforcing rib; 2. Swing arm; 21. Slot; 22. Clamping part; 221. Second rotating shaft hole; 3. Torsion spring; 31. First spring body; 32. Second spring body; 33. U-shaped connecting part; 4. Rotating shaft; 5. Push rod switch assembly; 51. Push rod; 511. First guide block; 512. Second guide block; 52. Base; 521. Control switch; 53. Elastic reset member; 6. Roller; 61. Connecting shaft. DETAILED DESCRIPTION

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present utility model; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] See also Figure 1 , Figure 2 As shown, an embodiment of the utility model provides a self-restoring swing arm structure 10, comprising: a fixed arm 1, a swing arm 2 and at least one torsion spring 3.

[0043] In some embodiments, an integrally formed torsion spring seat 11 is provided at the end of the fixed arm 1, the swing arm 2 is mounted on the torsion spring seat 11, and the swing arm 2 can rotate relative to the fixed arm 1, a slot 21 is provided on the swing arm 2, and the torsion spring 3 is installed on the torsion spring seat 11, and the pin of the torsion spring 3 passes through the torsion spring seat 11 and extends to one side of the swing arm 2 and is then fixed on the slot 21.

[0044] In this embodiment, a clamping portion 22 is provided at the end of the swing arm 2, and the clamping portion 22 is mounted on the torsion spring seat 11, so that the swing arm 2 can be rotatably mounted on the fixed arm 1;

[0045] The torsion spring 3 is installed on the torsion spring seat 11, and after the torsion spring 3 is twisted to a set angle, the pin of the torsion spring 3 is fixed on the slot, so that the torsion spring 3 has a certain pre-tightening force. In the absence of external force, the swing arm 2 rotates relative to the fixed arm 1 under the elastic reset action of the torsion spring 3, and a set angle is formed between the fixed arm 1 and the swing arm 2, thereby driving the mobile phone hose to retract.

[0046] In this embodiment, the included angle is set to 90° to 150°.

[0047] The self-restoring swing arm structure provided by the utility model decomposes the swing arm of the traditional straight rod structure into a fixed arm 1 and a swing arm 2 which are rotatably connected, so that the swing arm structure assembled on the instrument tray itself has the function of swing arm rotation, so as to simplify the internal structure setting of the instrument tray, thereby achieving the effect of reducing the overall volume and occupied space of the instrument tray; at the same time, since the swing arm 2 is rotatably arranged around the fixed arm 1, there is no need to set an avoidance hole on the instrument tray, and the swing arm structure can be installed at a position close to the doctor, thereby further reducing the space occupied by the instrument tray and facilitating the doctor's use; in addition, by setting a torsion spring 3 between the fixed arm 1 and the swing arm 2, when the doctor releases the mobile phone, the swing arm 2 can have a self-restoring ability, thereby improving the doctor's user experience.

[0048] See also Figure 2 As shown, in some embodiments, the self-restoring swing arm structure 10 further includes a rotating shaft 4 , which passes through the fixed arm 1 and the torsion spring seat 11 , so that the fixed arm 1 is rotatably mounted on the swing arm 2 around the rotating shaft 4 .

[0049] In this embodiment, a first shaft hole 111 is formed on the torsion spring seat 11, and a second shaft hole 221 is formed at a position corresponding to the first shaft hole 111 of the clamping portion 22. The shaft 4 passes through the second shaft hole 221 and the first shaft hole 111, so that the swing arm 2 is rotatably mounted on the fixed arm 1 around the shaft 4.

[0050] Furthermore, the outer circumferential surface of the rotating shaft 4 is provided with knurling. Specifically, the knurling is arranged on the outer circumferential surface where the rotating shaft 4 contacts the swing arm 2, that is, the surface of the rotating shaft 4 corresponding to the position of the second rotating shaft hole 221 is provided with knurling to increase the contact friction between the rotating shaft 4 and the swing arm 2, so as to prevent the swing arm 2 from slipping when rotating relative to the fixed arm 1.

[0051] Please continue reading Figure 2 As shown, in some embodiments, accommodating grooves 112 are respectively provided on both sides of the torsion spring seat 11, and the torsion spring 3 is a parallel double torsion spring.

[0052] See also Figure 3 As shown, the parallel double torsion spring includes a first spring body 31 and a second spring body 32, and the first spring body 31 and the second spring body 32 are respectively installed in the accommodating groove 112, wherein the pin of the first spring body 31 is connected with the pin of the second spring body 32 to form a U-shaped connecting part 33, and the U-shaped connecting part 33 is fixedly installed on the card slot 21.

[0053] The utility model adopts parallel double torsion springs as elastic members between the fixed arm 1 and the rotary arm 2 to increase the pre-tightening force during assembly, so that the rotary arm 2 can automatically rebound to achieve the retraction of the mobile phone hose.

[0054] See also Figure 2 As shown, in some embodiments, the self-restoring swing arm structure 10 further includes a top rod switch assembly 5 , and the top rod switch assembly 5 includes a top rod 51 and a base 52 .

[0055] See also Figures 4 to 7 As shown, in some embodiments, a guide groove 12 with two ends passing through is provided in the fixed arm 1, a push rod 51 is movably installed in the guide groove 12, and one end of the push rod 51 is exposed from the fixed arm 1; a base 52 is arranged at the end of the fixed arm 1 away from the rotating arm 2, and a control switch 521 is provided on the base 52, and the control switch 521 is located at the end of the guide groove 12 away from the rotating arm 2.

[0056] In this embodiment, the push rod 51 is used to contact the control switch 521, so that the control switch 521 is in a triggered state. In this embodiment, the triggered state is under software control, and the water and gas path of the corresponding mobile phone is closed.

[0057] When the doctor releases the mobile phone tube, under the torsion of the torsion spring 3, the swing arm 2 automatically rebounds until the swing arm 2 and the fixed arm 1 form a straight line, the end of the swing arm 2 is connected with the end of the fixed arm 1 and squeezes the push rod 51, and the end of the swing arm 2 pushes the push rod 51 along the guide groove 12 to approach the base 52. At this time, the activity trajectory of the push rod 51 is in the position of the pressure control section, one end of the push rod 51 is touched by the swing arm 2, and the other end of the push rod 51 presses the control switch 521. The control switch 521 is in a triggered state. The trigger state is controlled by the software, and the corresponding water and gas path of the mobile phone is closed. Figure 4 , Figure 5 shown.

[0058] In this embodiment, the fixed arm 1 is provided with a first through hole (not shown in the figure) and a second through hole (not shown in the figure) at both ends of the guide slot 12, and the apertures of the first through hole and the second through hole are both smaller than the slot diameter of the guide slot 12;

[0059] A first guide block 511 and a second guide block 512 with the same structure are respectively provided at both ends of the push rod 51. The first guide block 511 and the second guide block 512 both include a guide portion and a contact portion. The guide portion cooperates with the guide groove. The contact portion of the first guide block 511 cooperates with the first through hole, and the contact portion of the second guide block 512 cooperates with the second through hole.

[0060] The utility model provides a first guide block 511 and a second guide block 512 at both ends of the push rod 51, and utilizes the cooperation between the guide portion and the guide groove 12 to enable the push rod 51 to accurately move along the guide groove 12; at the same time, since the size of the guide portion is larger than the size of the first through hole or the second through hole, the push rod 51 is prevented from passing through the guide groove 12 from the first through hole or the second through hole; in addition, by providing a contact portion on the guide portion, one end of the push rod 51 can extend out of the guide groove 12 through the first through hole or the second through hole, thereby achieving contact with the control switch 521 or abutting against the end of the swing arm 2.

[0061] In some embodiments, the top rod switch assembly 5 also includes an elastic reset member 53, which is installed between the top rod 51 and the base 52. The elastic reset member is used to push the top rod away from the base along the guide groove to put the control switch in a non-triggered state. In this embodiment, the non-triggered state is under software control, and the corresponding water and gas path of the mobile phone is open.

[0062] When the doctor pulls the mobile phone tube and drives the swing arm 2 to rotate around the fixed arm 1, the end of the swing arm 2 is separated from the end of the fixed arm 1. At this time, the movable trajectory of the push rod is in the position of the reset section, and the elastic reset member 53 pushes the push rod 51 along the guide groove 12 away from the base 52. One end of the push rod 51 passes through the first through hole and extends out of the guide groove 12. The other end of the push rod 51 is pushed by the elastic reset member 53 and away from the control switch 521, so that the push rod 51 is separated from the control switch 521. The control switch 521 is in a non-triggered state. The non-triggered state is controlled by the software, and the corresponding water and gas path of the mobile phone is open. Figure 6 , Figure 7 shown.

[0063] In the embodiment of the utility model, the elastic reset member 53 cooperates with the push rod 51 and the swing arm 2 cooperates with the push rod 51, so that at least one end of the push rod 51 extends out of the guide groove 12, thereby realizing the contact and separation between the push rod 51 and the control switch 521, thereby controlling the control switch 521 to switch between the trigger state and the disconnected state, thereby controlling the opening and closing of the water and gas path of the corresponding mobile phone.

[0064] See also Figure 1 , Figure 2As shown, in some embodiments, the self-restoring swing arm structure 10 also includes a roller 6, which is rotatably mounted on the end of the swing arm 2 away from the fixed arm 1. In this embodiment, the roller 6 is rotatably mounted on the swing arm 2 through a connecting shaft 61, and a groove is provided on the roller 6.

[0065] The embodiment of the utility model arranges a roller 6 on the swing arm 2 to reduce the friction resistance of the mobile phone hose when it is extended and retracted. At the same time, a groove is arranged on the roller 6 so that the mobile phone hose can only be extended and retracted in the groove to limit the left and right swing of the mobile phone hose.

[0066] Please continue reading Figure 1 , Figure 2 As shown, in some embodiments, at least one reinforcing rib 13 is provided between the fixed arm 1 and the torsion spring seat 11 .

[0067] In the embodiment of the utility model, a plurality of reinforcing ribs 13 are provided to connect the fixed arm 1 and the torsion spring seat 11 , thereby increasing the structural strength of the fixed arm 1 and improving the structural reliability of the self-restoring swing arm structure 10 .

[0068] See also Figure 4 , Figure 6 As shown, based on the above self-restoring rotary arm structure 10, an embodiment of the utility model further provides an instrument tray, which includes a housing 20 and at least one self-restoring rotary arm structure 10 as above.

[0069] In some embodiments, at least one mounting slot is disposed on the housing 20 , and the self-restoring swing arm structure 10 is detachably mounted on the mounting slot.

[0070] The embodiment of the utility model decomposes the rotating arm of the traditional straight rod structure into a fixed arm 1 and a rotating arm 2 which are rotatably connected, so that the rotating arm structure installed on the installation groove itself has the function of rotating the rotating arm, and there is no need to provide a rotating structure and an avoidance hole on the instrument tray, thereby simplifying the structure of the instrument tray and reducing the overall volume of the instrument tray; since the rotating arm structure itself has the function of rotating the rotating arm, it can also simplify the rotation stroke and improve the doctor's flexibility in performing the rotation operation; at the same time, since the rotation stroke is optimized, the installation groove on the instrument tray can be set at a position close to the doctor, thereby further reducing the space occupied by the instrument tray and facilitating the doctor's use.

[0071] In this embodiment, the self-restoring swing arm structure 10 includes a fixed arm 1, a swing arm 2, a parallel double torsion spring connected between the fixed arm 1 and the swing arm 2, and a push rod switch assembly 5, wherein the push rod switch assembly 5 includes a push rod 51, an elastic return member 53 and a base 52, and the base 52 includes a control switch 521.

[0072] In this embodiment, the base 52 is rigidly connected to the bottom surface of the mounting groove through a fixing element. The fixed arm 1, the swing arm 2 and the parallel double torsion springs are assembled to form a self-restoring swing arm structure 10, which is then installed on the base 52 through the mounting groove. A guide groove 12 with two ends passing through is provided in the fixed arm 1, wherein the end of the guide groove 12 close to the swing arm 2 is connected to the outside through a first through hole, and the end of the guide groove close to the base 52 is connected to the outside through a second through hole.

[0073] In some embodiments, the push rod 51 is movably installed in the guide groove 12 of the fixed arm 1. In this embodiment, a first guide block 511 is provided at one end of the push rod 51 close to the swing arm 2, and a second guide block 512 is provided at one end of the push rod close to the base 52. The first guide block 511 and the second guide block 512 have the same structure, both including a guide portion and a contact portion, wherein the guide portion cooperates with the guide groove, the contact portion of the first guide block 511 cooperates with the first through hole, and the contact portion of the second guide block 512 cooperates with the second through hole.

[0074] When the push rod 51 moves along the guide groove 12 toward the swing arm 2, the contact portion of the first guide block 511 at least partially passes through the first through hole and is exposed to the fixed arm 1; when the push rod 51 moves along the guide groove 12 toward the base 52, the contact portion of the second guide block 512 at least partially passes through the second through hole and is exposed to the fixed arm 1, and contacts with the control switch 521, so that the control switch 521 is in a triggered state.

[0075] In some embodiments, the elastic reset member sleeve 53 is installed on the contact portion of the second guide block 512. In this embodiment, a baffle is also provided between the contact portion and the guide portion of the second guide block 512. One end of the elastic reset member 53 is connected to the baffle, and the other end is connected to the base 52.

[0076] The working principle of the instrument tray is as follows:

[0077] When the doctor releases the mobile phone tube, under the torsion of the torsion spring 3, the swing arm 2 automatically rebounds until the swing arm 2 and the fixed arm 1 form a straight line, and the end of the swing arm 2 is connected with the end of the fixed arm 1 and squeezes the push rod 51, and the end of the swing arm 2 pushes the push rod 51 along the guide groove 12 to approach the base 52. At this time, at the pressure control section position of the movable trajectory of the push rod 51, one end of the push rod 51 is touched by the swing arm 2, and the other end of the push rod 51 passes through the second through hole and presses the control switch 521. The control switch 521 is in a triggered state. The trigger state is controlled by the software, and the corresponding water and gas path of the mobile phone is closed. Figure 4 , Figure 5 shown.

[0078] When the doctor pulls the mobile phone tube and drives the swing arm 2 to rotate around the fixed arm 1, the end of the swing arm 2 is separated from the end of the fixed arm 1. At this time, the movable trajectory of the push rod is in the position of the reset section, and the elastic reset member 53 pushes the push rod 51 along the guide groove 12 away from the base 52. One end of the push rod 51 passes through the first through hole and extends out of the guide groove 12. The other end of the push rod 51 is pushed by the elastic reset member 53 and away from the control switch 521, so that the push rod 51 is separated from the control switch 521. The control switch 521 is in a non-triggered state. The non-triggered state is controlled by the software, and the corresponding water and gas path of the mobile phone is open. Figure 6 , Figure 7 shown.

[0079] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A self-restoring swing arm structure, characterized in that: It includes a fixed arm, a rotary arm and at least one torsion spring; An integrally formed torsion spring seat is provided at the end of the fixed arm; The swing arm is sleeved on the torsion spring seat, and the swing arm can rotate relative to the fixed arm, and a slot is provided on the swing arm; The torsion spring is mounted on the torsion spring seat, and the pin of the torsion spring passes through the torsion spring seat and extends toward one side of the swing arm, and is then fixed on the clamping slot.

2. The self-restoring swing arm structure according to claim 1, characterized in that: The self-restoring swing arm structure also includes a rotating shaft, which passes through the swing arm and the torsion spring seat, so that the swing arm is rotatably mounted on the fixed arm around the rotating shaft.

3. The self-restoring swing arm structure according to claim 2, characterized in that: The outer circumferential surface of the rotating shaft is provided with knurling.

4. The self-restoring swing arm structure according to claim 1, characterized in that: The torsion spring seat is provided with accommodating grooves on both sides, and the torsion spring is a parallel double torsion spring; The parallel double torsion spring includes a first spring body and a second spring body, and the first spring body and the second spring body are respectively installed in the accommodating groove, wherein the pin of the first spring body is connected with the pin of the second spring body to form a U-shaped connecting part, and the U-shaped connecting part is fixedly installed on the card slot.

5. The self-restoring swing arm structure according to claim 1, characterized in that: The self-restoring swing arm structure further comprises a push rod switch assembly, wherein the push rod switch assembly comprises a push rod and a base; The fixed arm is provided with a guide groove with two ends passing through, the push rod is movably installed in the guide groove, and one end of the push rod is exposed from the fixed arm; The base is arranged at one end of the fixed arm away from the rotary arm, and a control switch is arranged on the base, and the control switch is located at one end of the guide groove away from the rotary arm; At the pressure control section position of the moving track of the push rod, one end of the push rod is touched by the rotary arm, and the other end of the push rod presses the control switch.

6. The self-restoring swing arm structure according to claim 5, characterized in that: The top rod switch assembly further comprises an elastic reset member, which is installed between the top rod and the base; At the reset section position of the movable track of the push rod, one end of the push rod extends out of the guide groove, and the other end of the push rod is pushed by the elastic reset member and moves away from the control switch.

7. The self-restoring swing arm structure according to claim 5, characterized in that: The fixing arm is provided with a first through hole and a second through hole at both ends of the guide slot, respectively, and the apertures of the first through hole and the second through hole are both smaller than the slot diameter of the guide slot; The two ends of the push rod are respectively provided with a first guide block and a second guide block with the same structure, the first guide block and the second guide block both include a guide portion and a contact portion, the guide portion cooperates with the guide groove, the contact portion of the first guide block cooperates with the first through hole, and the contact portion of the second guide block cooperates with the second through hole.

8. The self-restoring swing arm structure according to claim 1, characterized in that: The self-restoring swing arm structure also includes a roller, which is rotatably mounted on one end of the swing arm away from the fixed arm, and a groove is provided on the roller.

9. The self-restoring swing arm structure according to claim 1, characterized in that: At least one reinforcing rib is provided between the fixed arm and the torsion spring seat, one end of the reinforcing rib is fixed to the fixed arm, and the other end is fixed to the torsion spring seat.

10. An instrument tray, characterized in that: It comprises a housing and at least one self-restoring swing arm structure according to any one of claims 1 to 9; The housing is provided with at least one mounting slot, and the self-restoring swing arm structure is detachably mounted on the mounting slot.

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