Travel switch and medical actuating mechanism

Abstract

A limit switch includes a support structure (10), a pressure-bearing structure (20), and a trigger assembly (30). The pressure-bearing structure is movably disposed on the support structure along the pressing direction (P) and the opposite direction of the pressing direction. The trigger assembly includes a trigger element (31), an elastic element (32), and a first switching unit (33). The trigger element is movably disposed on the pressure-bearing structure along the pressing direction and the opposite direction of the pressing direction. The elastic element acts on the trigger element and the pressure-bearing structure and can apply an elastic restoring force along the pressing direction to the trigger element. The first switching unit is disposed on the support structure and located in front of the trigger element along the pressing direction. During the movement of the pressure-bearing structure, the trigger element can gradually squeeze the elastic element after contacting the first switching unit, and under the action of the elastic element, press against the first switching unit to close it. This limit switch has stable closure and a long service life. This utility model also provides a medical operating mechanism including the above-mentioned limit switch.

Description

Technical Field

[0001] This utility model relates to the field of medical control mechanisms, and more particularly to a limit switch and a medical control mechanism including the same. Background Technology

[0002] Medical exposure systems, such as X-ray machines, have an exposure brake, a key device for controlling X-ray exposure. This brake includes a limit switch. Existing limit switches use a spring-loaded trigger to close a microswitch, causing the spring to elastically deform. Under the continuous action of the spring's elastic restoring force, the microswitch remains closed.

[0003] However, in this type of limit switch structure, the spring is prone to fatigue damage after repeated use, which causes its deformation to not fully recover. As a result, the elastic restoring force of the spring is insufficient to squeeze the trigger to close the micro switch, or insufficient to continuously squeeze the trigger, causing the limit switch to fail to close or to close unstablely, thus affecting normal medical procedures. Utility Model Content

[0004] The purpose of this invention is to provide a limit switch that has stable closure and a long service life.

[0005] Another objective of this invention is to provide a medical operating mechanism including the aforementioned limit switch, which has stable performance and a long service life.

[0006] The limit switch provided by this utility model includes a support structure, a pressure-bearing structure, and a triggering assembly. The pressure-bearing structure is movably disposed on the support structure along the pressing direction and the opposite direction of the pressing direction. The triggering assembly includes a trigger element, an elastic element, and a first switching unit. The trigger element is movably disposed on the pressure-bearing structure along the pressing direction and the opposite direction of the pressing direction. The elastic element acts on the trigger element and the pressure-bearing structure and can apply an elastic restoring force along the pressing direction to the trigger element. The first switching unit is disposed on the support structure and located in front of the trigger element along the pressing direction. During the movement of the pressure-bearing structure along the pressing direction, the trigger element can gradually squeeze the elastic element after contacting the first switching unit, and under the action of the elastic element, press against the first switching unit to close the first switching unit.

[0007] By arranging the pressure-bearing structure, trigger, and first switching unit along the pressing direction, the pressure-bearing structure transmits the pressing force to the trigger through the elastic element, enabling the first switching unit to close stably and effectively. The elastic element can also absorb the impact force during the pressing process, preventing the trigger from causing rigid impact to the first switching unit, reducing the mechanical wear of the first switching unit, and extending its service life.

[0008] In another illustrative embodiment of the limit switch, the limit switch includes several triggering components. The limit switch is configured to close different first switching units when the pressure-bearing structure moves to different travel positions. This allows different first switching units to be closed at different travel positions respectively.

[0009] In another illustrative embodiment of the limit switch, the pressure-bearing structure has a first receiving cavity. A connecting post extending in the pressing direction protrudes from the rear end wall of the first receiving cavity along the pressing direction. The trigger element is sleeve-shaped and has a cylindrical groove. The trigger element is sleeved onto the connecting post through the cylindrical groove. The elastic element is a compression spring and is sleeved onto the connecting post. One end of the elastic element abuts against the rear end wall of the first receiving cavity along the pressing direction, and the other end abuts against the front end wall of the cylindrical groove along the pressing direction. This structure is simple, stable, and space-saving.

[0010] In another illustrative embodiment of the limit switch, a first hook is formed on the outer surface of the trigger element, and a retaining plate protrudes from the wall of the first receiving cavity. The first hook can engage with the retaining plate in the pressing direction to prevent the trigger element from detaching from the pressure-bearing structure in the pressing direction. This structure is simple and easy to install.

[0011] In another illustrative embodiment of the limit switch, the pressure-bearing structure has a guide groove extending in the pressing direction. The trigger has a guide portion protruding in a direction perpendicular to the pressing direction. The guide portion is slidably inserted into the guide groove in both the pressing direction and the opposite direction of the pressing direction. This facilitates stable movement of the trigger in the pressing direction, and the structure is simple and easy to install.

[0012] In another illustrative embodiment of the limit switch, each first switch unit includes a switch body with a switch button and a pad disposed on the rear side of the switch button along the pressing direction. The switch body is a tactile switch, and the trigger element can indirectly press the switch button by pressing the pad under the action of the elastic element, thereby closing the switch body. The pads of several first switch units have different heights along the pressing direction. In this way, the limit switch can close different switch bodies when the pressure-bearing structure is at different travel positions.

[0013] In another illustrative embodiment of the limit switch, the limit switch further includes a second switch disposed on the support structure. The second switch is an optocoupler switch. The pressure-bearing structure also includes a light-shielding member. During the movement of the pressure-bearing structure along the pressing direction, the light-shielding member can move from a position blocking the optocoupler optical path of the second switch to a position avoiding the optocoupler optical path, thereby closing the second switch. This allows for the installation of various switches, facilitating adaptation to various application scenarios.

[0014] In another illustrative embodiment of the limit switch, the limit switch includes two second switches arranged along the pressing direction, and the two second switches are electrically connected in parallel. The light-shielding member includes two light-shielding parts arranged along the pressing direction, and the two light-shielding parts are respectively used to block the optical paths of the optocouplers of the two second switches. This helps to improve the reliability and safety of the signal transmission circuit of the limit switch.

[0015] In another illustrative embodiment of the limit switch, the limit switch includes two second switches arranged perpendicular to the pressing direction, and the two second switches are electrically connected in parallel. The pressure-bearing structure includes two light-shielding members, which are used to block the optical paths of the optocouplers of the two second switches respectively. This helps to improve the reliability and safety of the signal transmission circuit of the limit switch. This structure can effectively compress the space along the pressing direction, which helps to save space.

[0016] In another illustrative embodiment of the limit switch, the limit switch further includes a third switch disposed on the support structure, the third switch being a quick-acting switch. The pressure-bearing structure also includes a trigger rod, which, during the movement of the pressure-bearing structure in the pressing direction, presses the trigger of the third switch in the pressing direction, causing the third switch to close. This allows for the installation of various switches, facilitating adaptation to diverse application scenarios.

[0017] In another illustrative embodiment of the limit switch, a pressing mechanism and a spring are further included. The pressing mechanism is movably disposed on the support structure along the pressing direction and the opposite direction of the pressing direction, and is located on the rear side of the pressure-bearing structure along the pressing direction. The spring abuts against the pressing mechanism and the support structure, and can drive the pressing mechanism to reset in the opposite direction of the pressing direction by an elastic restoring force. This facilitates pressing the pressure-bearing structure.

[0018] In another illustrative embodiment of the limit switch, the support structure includes a support. The support has a second receiving cavity and a second through hole arranged sequentially and communicating with each other along the pressing direction. The pressing structure includes a pressing part and an insertion part arranged sequentially along the pressing direction. The insertion part is movably inserted into the second through hole along the pressing direction and the opposite direction of the pressing direction, and the pressing part is located in the second receiving cavity. A spring is disposed between the bottom walls of the pressing part and the second receiving cavity. The front end of the insertion part along the pressing direction is provided with a flange, and the end of the support can abut against the flange to prevent the pressing structure from disengaging from the support when reset in the opposite direction of the pressing direction. This structure can reset the pressing structure and prevent the pressing structure from disengaging from the support during reset.

[0019] In another illustrative embodiment of the limit switch, the support structure includes a support frame. A pressure-bearing structure is movably disposed within the support frame in both the pressing direction and the opposite direction. The pressure-bearing structure also includes a second latch, and the side wall of the support frame has an elongated hole parallel to the pressing direction. The second latch is movably engaged in the elongated hole in both the pressing direction and the opposite direction to prevent the pressure-bearing structure from disengaging from the support frame when resetting in the opposite direction of the pressing direction. This structure is simple and easy to install.

[0020] In another illustrative embodiment of the limit switch, a support plate is also included. A support frame is detachably mounted on the support plate. The support plate is a printed circuit board, and the first switching unit is mounted on and electrically connected to the support plate. This structure easily saves wiring space.

[0021] This invention also provides a medical operating mechanism, which includes the aforementioned limit switch. This medical operating mechanism offers stable performance and a long service life. Attached Figure Description

[0022] The following figures are for illustrative purposes only and do not limit the scope of the present invention.

[0023] Figure 1 This is a cross-sectional schematic diagram illustrating one embodiment of a limit switch.

[0024] Figure 2 and Figure 3 For illustrative purposes Figure 1 The connection relationship between the pressure-bearing structure, the triggering element, and the elastic element is shown.

[0025] Figure 4 This is a structural diagram illustrating three other schematic embodiments of the limit switch.

[0026] Figure 5 Used to illustrate the connection Figure 4 The DMG signal transmitting circuit of the second switch shown in Figure a.

[0027] Figure 6 This is a cross-sectional schematic diagram illustrating another illustrative embodiment of a limit switch.

[0028] Figures 7 to 9 for Figure 6 The diagram shows a cross-sectional view of the limit switch at different travel points.

[0029] Label Explanation

[0030] 10 Support Structure

[0031] 11 supports

[0032] 111 Second Receiving Chamber

[0033] 112 Second Through Hole

[0034] 13 Supporting Frames

[0035] 131 long holes

[0036] 132 Third Hook

[0037] 15 support plates

[0038] 151 First Through Hole

[0039] 20 Pressure-bearing structure

[0040] 21 First Receiving Chamber

[0041] 211 card platform

[0042] 212 guide groove

[0043] 22 connecting columns

[0044] 23 light shields

[0045] 231 shading part

[0046] 24 trigger levers

[0047] 25 Second hook

[0048] 30 trigger components

[0049] 31 triggers

[0050] 311 cylindrical groove

[0051] 312 First Hook

[0052] 313 Guiding Department

[0053] 32 elastic elements

[0054] 33 First Switching Unit

[0055] 331 switch body

[0056] 332 pad

[0057] 40 Second Switch

[0058] 41 light outlet

[0059] 50 Third Switch

[0060] 51 trigger

[0061] 60-press structure

[0062] 61 Pressing Part

[0063] 62 Insertion section

[0064] 621 Third Reception Chamber

[0065] 622 Flip Edge

[0066] 70 spring

[0067] P Pressing direction

[0068] F Pressing pressure Detailed Implementation

[0069] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments of the present utility model are now described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0070] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0071] In this document, "first," "second," and "third" do not indicate their importance or order, but are only used to distinguish them from each other for the purpose of document description.

[0072] In this article, terms such as "up," "down," "front," "back," "inner," and "outer" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0073] To keep the drawings simple, only the parts relevant to this utility model are shown schematically in each figure, and they do not represent the actual structure of the product. In each figure, the arrow pointing in the direction of pressing P indicates forward, and the arrow pointing away from the direction indicates backward.

[0074] Figure 1 This is a cross-sectional schematic diagram illustrating one embodiment of a limit switch. In this illustrative embodiment, see... Figure 1 The limit switch includes a support structure 10, a pressure-bearing structure 20, and two trigger components 30. The support structure 10 includes, for example, a support plate 15 and a support frame 13, with no relative movement between them. They can be detachably assembled together or formed as a single unit. The pressure-bearing structure 20 is movably disposed on the support structure 10 along the pressing direction P and the opposite direction of the pressing direction P.

[0075] Each trigger assembly 30 includes a trigger element 31, an elastic element 32, and a first switching unit 33. Each trigger element 31 is movably disposed on the pressure-bearing structure 20 along the pressing direction P and the opposite direction of pressing direction P. The elastic element 32 acts on the trigger element 31 and the pressure-bearing structure 20 and can apply an elastic restoring force along the pressing direction P to the trigger element 31. The first switching unit 33 is disposed on the support structure 10 and is located on the front side of the trigger element 31 along the pressing direction P (i.e.,...). Figure 1 The first switch unit 33 is located below the trigger member 31. During the movement of the pressure-bearing structure 20 along the pressing direction P, the trigger member 31 can gradually squeeze the elastic member 32 after contacting the first switch unit 33, and under the action of the elastic member 32, press against the first switch unit 33 to close the first switch unit 33.

[0076] For details, see Figure 1 Each first switch unit 33 includes a switch body 331 with a switch button and a pad 332 disposed on the rear side of the switch button along the pressing direction P, i.e. Figure 1 The middle pad 332 is located above the switch button. The switch body 331 is a tactile switch, and the pads 332 of the two first switch units 33 have different heights along the pressing direction P. In this illustrative embodiment, the two pads 332 are, for example, silicone pads, which belong to the same integral molded part, but are not limited to this. In other illustrative embodiments, each pad 332 can also be an independent component. The trigger member 31 can indirectly press the switch button by pressing the pads 332 under the action of the elastic member 32, thereby closing the switch body 331. By setting different heights of the two first switch units 33 along the pressing direction P, the limit switch can close different first switch units 33 when the pressure-bearing structure 20 moves to different strokes. However, it is not limited to this. The limit switch can also close different first switch units 33 when the pressure-bearing structure 20 moves to different strokes by setting the height of each trigger member 31 along the pressing direction P or by setting the pressure-bearing structure 20 as a stepped structure.

[0077] By arranging the pressure-bearing structure 20, the trigger element 31, and the first switch unit 33 along the pressing direction P, the pressure-bearing structure 20 transmits the pressing force to the trigger element 31 along the pressing direction through the elastic element 32, so that the first switch unit 33 can be closed stably and effectively. The elastic element 32 can absorb the impact force during the pressing process, avoid the trigger element 31 from causing rigid impact to the first switch unit 33, reduce the mechanical wear of the first switch unit 33, and extend the service life of the limit switch.

[0078] In other illustrative embodiments, the number of triggering components 30 may be more than two. In special cases, there may be only one triggering component 30.

[0079] Figure 2and Figure 3 For illustrative purposes Figure 1 The connection relationship between the pressure-bearing structure, the triggering element, and the elastic element is shown. Figure 2 sectional perspective and Figure 1 The cross-sectional views are perpendicular to each other. Figure 2 Only the pressure-bearing structure 20, the triggering element 31, and the elastic element 32 are shown. Figure 3 for Figure 2 A structural diagram viewed from below, in the opposite direction of the pressing direction. Figure 3 The direction of pressure P is perpendicular to the paper and points towards the observer. See also Figure 2 and Figure 3 In this illustrative embodiment, the pressure-bearing structure 20 has a first receiving cavity 21. The first receiving cavity 21 extends along the rear end wall of the pressing direction P (i.e., Figure 2 Two connecting posts 22 protruding from the upper end wall of the first receiving cavity 21, extending along the pressing direction P, are provided. Each trigger element 31 is sleeve-shaped and has a cylindrical groove 311. Each trigger element 31 is sleeved onto a connecting post 22 through the cylindrical groove 311. The elastic element 32 is a compression spring and is sleeved onto the connecting post 22. One end of the elastic element 32 abuts against the rear end wall of the first receiving cavity 21 along the pressing direction P (i.e., Figure 2 The upper end of the first receiving cavity 21 is located at one end, and the other end abuts against the front end wall of the cylindrical groove 311 along the pressing direction P (i.e., the upper end of the first receiving cavity 21 is located at the other end). Figure 2 (Lower end wall of the central column groove 311). This structure is simple, stable, and space-saving.

[0080] like Figure 2 As shown, two first hooks 312 are formed on the outer surface of the trigger member 31, and two retaining platforms 211 are protruding from the cavity wall of the first receiving cavity 21. Each first hook 312 can overlap with a retaining platform 211 along the pressing direction P to prevent the trigger member 31 from detaching from the pressure-bearing structure 20 along the pressing direction P. Naturally, the number of first hooks 312 and retaining platforms 211 can be flexibly adjusted according to the actual application scenario. This structure is simple and easy to install.

[0081] like Figure 3 As shown, the walls of the two first receiving cavities 21 are interconnected, forming guide grooves 212 extending along the pressing direction P. Each trigger 31 has a guide portion 313 protruding in a direction perpendicular to the pressing direction P, and each guide portion 313 is inserted into the guide groove 212 along the pressing direction P and in the opposite direction of the pressing direction P. In other illustrative embodiments, a guide groove 212 may be independently provided for each guide portion 313. Naturally, the number of guide grooves 212 can be adjusted according to the number of triggers 31 provided. This facilitates the stable movement of the triggers 31 along the pressing direction P, and the structure is simple and easy to install.

[0082] Figure 4This is a schematic diagram illustrating three other illustrative embodiments of the limit switch. See also... Figure 4 In section a, the limit switch provided in this illustrative embodiment is... Figure 1 Based on the limit switch shown, two second switches 40 are also included. The second switches 40 are optocoupler switches. However, this is not a limitation; there may be only one or more second switches 40. The two second switches 40 are arranged along the pressing direction P on one side of the support plate 15 and are electrically connected in parallel. Two first switch units 33 are disposed on the other side of the support plate 15. Figure 4 (A not shown in Figure 1). The pressure-bearing structure 20 also includes a light-shielding member 23. The light-shielding member 23 includes two light-shielding parts 231 arranged along the pressing direction P. The support plate 15 has a first through hole 151, through which the light-shielding member 23 passes, allowing the two light-shielding parts 231 to extend into the interiors of the two second switches 40 respectively. During the movement of the pressure-bearing structure 20 along the pressing direction P, each light-shielding part 231 can move from a position blocking the optical coupler path of the second switch 40 to a position avoiding the optical coupler path, thereby closing the second switch 40. This allows for the installation of various switches, facilitating adaptation to various application scenarios.

[0083] The limit switch provided in this illustrative embodiment can be applied to the exposure brake of medical exposure equipment such as X-ray machines. In this illustrative embodiment, the limit switch has two optocoupler switches and two tactile switches connected in parallel. The two optocoupler switches are connected in parallel, for example, to a DMG signal transmitting circuit that can emit a DMG signal. One tactile switch is connected, for example, to a VK signal transmitting circuit that can emit a VK signal, and the other tactile switch is connected, for example, to an HK signal transmitting circuit that can emit an HK signal. When the switches connected to each signal transmitting circuit are closed, the signal transmitting circuit can transmit a predefined signal to the control center. Among them, the DMG signal is the motion pre-motion signal of the moving parts in the medical exposure equipment. When the control center receives the DMG signal, the control center controls the moving parts to start moving. The VK signal is the X-ray tube preheating signal. When the control center receives the VK signal, the control center controls the X-ray tube to start preheating. The HK signal is the X-ray release signal. When the control center receives the HK signal, the control center controls the X-ray tube to start releasing X-rays. Therefore, the limit switch provided in this illustrative embodiment, by connecting the three signal transmitting circuits through different switches, can avoid mutual interference between the three signals.

[0084] Figure 5 Used to illustrate the connection Figure 4 The DMG signal transmitting circuit of the second switch shown in Figure a. See also: Figure 5The left-side circuit supplies power to the input terminals 1 and 2 of the two optocouplers, causing the internal LEDs of the optocouplers to illuminate. The middle circuit connects the output terminals 3 and 4 of the two optocouplers to receive the output signals from the optocouplers. The right-side circuit converts the received signals from the optocouplers into DMG signals and sends them to the control center. When the pressure-bearing structure 20 moves along the pressing direction P, causing the light-shielding member 23 to avoid the optical path of the optocouplers, the two second switches 40 close simultaneously, and the DMG signal transmitting circuit emits a DMG signal. The DMG signal transmitting circuit uses two parallel optocoupler switches. When one optocoupler switch fails, the other can continue to operate, thereby improving the reliability of the DMG signal transmitting circuit. Furthermore, the optocoupler switches can isolate voltage and current interference between the input and output terminals, which helps improve the safety of the DMG signal transmitting circuit.

[0085] Since tactile switches are common microswitches in this field, their working principle involves changing the connection state of the internal conductive structure through external pressing action, which will not be explained here using circuit diagrams. Therefore, the VK signal transmitting circuit and HK signal transmitting circuit connected to the two tactile switches respectively can transmit VK signals and HK signals to the control center after the two tactile switches are closed. However, this is not the only possibility; in other illustrative embodiments, the types of signals transmitted by each signal transmitting circuit can be flexibly defined according to the actual application scenario.

[0086] See Figure 4 In section b, this illustrative embodiment is similar to... Figure 4 The similarities to the illustrative embodiment provided in section a will not be repeated here. The difference lies in that the limit switch provided in this illustrative embodiment includes two second switches 40 arranged in a direction perpendicular to the pressing direction P. The pressure-bearing structure 20 includes two light-shielding members 23, which are used to block the optical coupling paths of the two second switches 40 respectively. This structure can effectively compress the space along the pressing direction, which is beneficial for saving space. In this illustrative embodiment, the DMG signal transmitting circuit connecting the two second switches 40 is also as follows... Figure 5 As shown.

[0087] See Figure 4 c, the limit switch provided in this illustrative embodiment is in Figure 1Based on the limit switch shown, a third switch 50 is also included, which is a quick-acting switch. However, it is not limited to this; the number of third switches 50 can also be two or more. The third switch 50 is located on one side of the support plate 15, and two tactile switches are located on the other side of the support plate 15. The support plate 15 has a first through hole 151, and the pressure-bearing structure 20 also includes a trigger rod 24. During the movement of the pressure-bearing structure 20 along the pressing direction P, the trigger rod 24 passes through the first through hole 151 and presses the trigger 51 of the third switch 50 along the pressing direction P, causing the third switch 50 to close. During the subsequent stroke of the pressure-bearing structure 20, the trigger rod 24 continues to press the trigger 51 of the third switch 50, causing the trigger 51 of the third switch 50 to retract along the pressing direction P.

[0088] It should be noted that the three illustrative embodiments described above can all be applied to the exposure brake of medical exposure equipment such as X-ray machines. The signal transmitting circuit connecting two tactile switches and a second or third switch can be flexibly defined to transmit the type of signal according to the actual application requirements. The second or third switch can also be replaced by another tactile switch, that is, the three signal transmitting circuits are respectively connected to the three tactile switches.

[0089] In the three illustrative embodiments described above, see Figure 4 The pressure-bearing structure 20, consisting of points a, b, and c, is movably disposed within the support frame 13 along the pressing direction P and in the opposite direction of pressing P. The pressure-bearing structure 20 also includes two second hooks 25. The side wall of the support frame 13 has elongated holes 131 parallel to the pressing direction P. The second hooks 25 are movably engaged in the elongated holes 131 along the pressing direction P and in the opposite direction of pressing P to prevent the pressure-bearing structure 20 from disengaging from the support frame 13 when resetting in the opposite direction of pressing P. This structure is simple and easy to install.

[0090] The support plate 15 has two small holes. Figure 4 (Not shown in the image), the support frame 13 is equipped with two third hooks 132. Figure 4 The two third hooks 132 are not shown in the middle due to the angle relationship. Figure 4 Only one of options b and c is shown. The support frame 13 is detachably mounted on the support plate 15 via the engagement of the third hook 132 and the small hole. Of course, the number of the third hook 132 and the small hole can be adjusted according to the actual application. In the three illustrative embodiments described above, the support plate 15 is a printed circuit board. Figure 4 In a and b, two first switch units 33 and a second switch 40 are disposed on and electrically connected to the support plate 15. Figure 4In embodiment c, two first switch units 33 and a third switch 50 are disposed on and electrically connected to the support plate 15. This structure easily saves wiring space. However, it is not limited to this; in other illustrative embodiments, the first switch unit 33, the second switch 40, and the third switch 50 can all be connected to other components, for example, by wires, to form their respective signal transmission circuits.

[0091] Figure 6 This is a cross-sectional schematic diagram illustrating another illustrative embodiment of the limit switch. See also... Figure 6 The limit switch provided in this illustrative embodiment is... Figure 4 Based on the limit switch shown in Figure a, it also includes a support 11 for the support structure 10, a pressing structure 60, and a spring 70. The pressing structure 60 is movably disposed on the support 11 along the pressing direction P and the opposite direction of the pressing direction P, and is located on the rear side of the pressure-bearing structure 20 along the pressing direction P (i.e., Figure 6 The pressing structure 60 is located above the pressure-bearing structure 20. The spring 70 abuts against the pressing structure 60 and the support 11, and can drive the pressing structure 60 to reset in the opposite direction of the pressing direction P through elastic restoring force. This facilitates pressing the pressure-bearing structure 20 and facilitates the reset of the pressing structure 60.

[0092] Specifically, the support 11 is, for example, mounted on an external device. The support 11 has a second receiving cavity 111 and a second through hole 112 arranged sequentially and communicating with each other along the pressing direction P. The pressing structure 60 includes a pressing part 61 and an insertion part 62 arranged sequentially along the pressing direction P. The pressing structure 60 is, for example, a one-piece molded structure, but is not limited thereto; the pressing structure 60 can also be assembled from multiple parts. The insertion part 62 is movably inserted into the second through hole 112 along the pressing direction P and the opposite direction of the pressing direction P, and the pressing part 61 is located in the second receiving cavity 111. The outer side wall of the insertion part 62 is in close contact with the hole wall of the second through hole 112, and the insertion part 62 has a third receiving cavity 621 extending along the pressing direction P. The pressure-bearing structure 20 protrudes from the support frame 13 in the opposite direction of the pressing direction P, and the pressure-bearing structure 20 and the support frame 13 are inserted into the third receiving cavity 621. It should be noted that the insertion part 62 may also not have a third receiving cavity 621. Guided by the second through hole 112, the pressing force F applied to the pressing structure 60 can be evenly transmitted to the pressure-bearing structure 20. The pressure-bearing structure 20 then transmits the pressing force F to the trigger 31 via the elastic member 32. The trigger 31, through the cooperation of its guide portion 313 and guide groove 212, can evenly transmit the pressing force F to the first switching unit 33, thereby improving the closing stability of the switch body 331. The light-shielding member 23 or the trigger rod 24, being part of the pressure-bearing structure 20, transmits the pressing force F more directly and stably than the trigger 31.

[0093] Spring 70 is disposed between the bottom wall of pressing part 61 and second receiving cavity 111. The front end of insertion part 62 along the pressing direction P (i.e., Figure 6 The lower end of the insertion part 62 is provided with a flange 622, and the wall of the second through hole 112 can abut against the flange 622 to prevent the pressing structure 60 from disengaging from the support 11 when it resets in the opposite direction of the pressing direction P. This structure can reset the pressing structure 60 and prevent the pressing structure 60 from disengaging from the support 11 during reset.

[0094] The following is through Figures 6 to 9 To explain Figure 6 The diagram illustrates the working principle of the limit switch. (For clarity, the diagram is omitted.) Figures 6 to 9 Only the trigger component 30 on the right is marked. For example... Figure 6 As shown, the limit switch is in the unpressed state at this time, and the light-shielding part 231 of the light-shielding member 23 ( Figure 6 The dashed rectangle in the image blocks the light outlet 41 of the optical coupler. Figure 6 (The small dotted circle in the image) The trigger 31 on the right side contacts its corresponding pad 332, while the trigger 31 on the left side floats above its corresponding pad 332 without contacting it. The pressure-bearing structure 20 protrudes from the support frame 13 in the opposite direction of the pressing direction P, leaving a gap between the support frame 13 and the rear wall of the third receiving cavity 621 in the pressing direction P (the gap is located at...). Figure 6 Above the middle support frame 13).

[0095] After a pressing force F is applied to the pressing structure 60 along the pressing direction P, the pressing structure 60 moves along the pressing direction P, driving the pressure-bearing structure 20 to move to... Figure 7 The route shown is from Figure 6 Exercise to Figure 7 The travel distance of the pressure-bearing structure 20 is, for example, 1 mm to 2 mm. At this time, the light-shielding part 231 moves from the position of blocking the light outlet 41 to the position of avoiding the light outlet 41, triggering the working mechanism of the optocoupler and causing the second switch 40 to close. The circuit connected to the second switch 40, such as the DMG signal transmitting circuit, transmits a DMG signal to the control center. Meanwhile, the trigger 31 on the right side squeezes its corresponding pad 332, causing it to deform slightly, but does not trigger the switch body 331 to close. The gap between the support frame 13 and the rear cavity wall of the third receiving cavity 621 along the pressing direction P narrows.

[0096] The pressure-bearing structure 20 continues to run along the pressing direction P until... Figure 8 ,from Figure 7 Exercise to Figure 8The travel distance of the pressure-bearing structure 20 is, for example, 1 mm to 2 mm. At this time, the light-shielding member 23 continues to move along the pressing direction P, and the second switch 40 remains closed. The trigger member 31 on the right side squeezes its corresponding pad 332 to continue deforming, thereby triggering the right switch body 331 to close. The circuit connected to the right switch body 331, such as the VK signal transmitting circuit, transmits a VK signal to the control center. The trigger member 31 on the left side has not yet touched its corresponding pad 332, and the gap between the support frame 13 and the rear cavity wall of the third receiving cavity 621 along the pressing direction P continues to narrow.

[0097] The pressure-bearing structure 20 continues to run along the pressing direction P until... Figure 9 ,from Figure 8 Exercise to Figure 9 The travel distance of the pressure-bearing structure 20 is, for example, 1 mm to 2 mm. At this time, the light-shielding member 23 continues to move along the pressing direction P, and the second switch 40 remains closed. The trigger member 31 on the right side stops moving under the pressure of its corresponding pad 332 (equivalent to moving relative to the pressure-bearing structure 20 in the opposite direction of the pressing direction P), and the switch body 331 on the right side remains closed. The trigger member 31 on the left side presses against its corresponding pad 332 to close the switch unit on the left side, and the circuit connected to the switch body 331 on the left side, such as the HK signal transmitting circuit, transmits an HK signal to the control center. At this time, the support frame 13 abuts against the pressure-bearing structure 20, and the pressure-bearing structure 20 can no longer move along the pressing direction P.

[0098] It is worth noting that in the pressure-bearing structure 20 from Figure 6 The state shown moves to Figure 9 During the process shown, the operator can directly press the button to... Figure 6 Exercise to Figure 9 Instead of Figure 7 and Figure 8 It remains in one of two states.

[0099] After the pressing force F is removed, the pressing structure 60 returns to its original position in the opposite direction of the pressing direction P under the action of the spring 70. The pressure-bearing structure 20 returns to its original position in the opposite direction of the pressing direction P under the action of the elastic element 32.

[0100] This invention also provides a medical operating mechanism, which includes the aforementioned limit switch. The medical operating mechanism is, for example, the exposure handbrake of an X-ray machine. This medical operating mechanism offers stable performance and a long service life.

[0101] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0102] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent implementation schemes or modifications made without departing from the spirit of the present utility model, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present utility model.

Claims

1. A travel switch characterized by, include: Support structure (10); A pressure-bearing structure (20) is movably disposed on the support structure (10) along the pressing direction (P) and the opposite direction of the pressing direction (P); as well as Triggering component (30), which includes: A trigger (31) is movably disposed on the pressure-bearing structure (20) along the pressing direction (P) and the opposite direction of the pressing direction (P). An elastic element (32) acts on the trigger (31) and the pressure-bearing structure (20) and is capable of applying an elastic restoring force to the trigger (31) along the pressing direction (P), and The first switch unit (33) is disposed on the support structure (10) and located on the front side of the trigger (31) along the pressing direction (P). During the movement of the pressure bearing structure (20) along the pressing direction (P), the trigger (31) can gradually squeeze the elastic member (32) after contacting the first switch unit (33), and press the first switch unit (33) under the action of the elastic member (32) to close the first switch unit (33).

2. The travel switch of claim 1, wherein The limit switch includes several of the trigger components (30), and the limit switch is configured to close different first switch units (33) when the pressure structure (20) moves to different travel positions.

3. The travel switch of claim 1, wherein The pressure-bearing structure (20) has a first receiving cavity (21). A connecting post (22) extending along the pressing direction (P) is provided on the rear end wall of the first receiving cavity (21) along the pressing direction (P). The trigger (31) is sleeve-shaped and has a cylindrical groove (311). The trigger (31) is sleeved on the connecting post (22) through the cylindrical groove (311). The elastic member (32) is a compression spring and is sleeved on the connecting post (22). One end of the elastic member (32) abuts against the rear end wall of the first receiving cavity (21) along the pressing direction (P), and the other end abuts against the front end wall of the cylindrical groove (311) along the pressing direction (P).

4. The travel switch of claim 3, wherein A first hook (312) is formed on the outer surface of the trigger (31), and a locking platform (211) is provided on the cavity wall of the first receiving cavity (21). The first hook (312) can engage with the locking platform (211) along the pressing direction (P) to prevent the trigger (31) from disengaging from the pressure-bearing structure (20) along the pressing direction (P).

5. The travel switch of claim 3, wherein The pressure-bearing structure (20) has a guide groove (212) extending along the pressing direction (P), and the trigger (31) has a guide portion (313) protruding in a direction perpendicular to the pressing direction (P). The guide portion (313) is slidably inserted into the guide groove (212) along the pressing direction (P) and the opposite direction of the pressing direction (P).

6. The travel switch of claim 2, wherein Each of the first switch units (33) includes a switch body (331) with a switch button and a pad (332) disposed on the rear side of the switch button along the pressing direction (P). The switch body (331) is a tactile switch. The trigger (31) can indirectly press the switch button by pressing the pad (332) under the action of the elastic member (32), thereby closing the switch body (331). The height of the pads (332) of the several first switch units (33) along the pressing direction (P) is different.

7. The travel switch of claim 1, wherein The limit switch also includes a second switch (40) disposed on the support structure (10). The second switch (40) is an optocoupler switch. The pressure-bearing structure (20) also includes a light-shielding member (23). During the movement of the pressure-bearing structure (20) along the pressing direction (P), the light-shielding member (23) can move from the position of blocking the optocoupler optical path of the second switch (40) to the position of avoiding the optocoupler optical path, so as to close the second switch (40).

8. The travel switch of claim 7, wherein The limit switch includes two second switches (40) arranged along the pressing direction (P), and the two second switches (40) are electrically connected in parallel. The light shield (23) includes two light shielding parts (231) arranged along the pressing direction (P), and the two light shielding parts (231) are respectively used to block the optical path of the two second switches (40).

9. The travel switch of claim 7, wherein The limit switch includes two second switches (40) arranged in a direction perpendicular to the pressing direction (P), the two second switches (40) are electrically connected in parallel, and the pressure-bearing structure (20) includes two light-shielding members (23), the two light-shielding members (23) are respectively used to block the optical paths of the two second switches (40).

10. The travel switch of claim 1, wherein The limit switch also includes a third switch (50) disposed on the support structure (10). The third switch (50) is a quick-acting switch. The pressure-bearing structure (20) also includes a trigger rod (24). During the movement of the pressure-bearing structure (20) along the pressing direction (P), the trigger rod (24) presses the trigger of the third switch (50) along the pressing direction (P) to close the third switch (50).

11. The travel switch of claim 1, wherein Also includes: A pressing structure (60) is movably disposed on the support structure (10) along the pressing direction (P) and the opposite direction of the pressing direction (P) and located on the rear side of the pressure-bearing structure (20) along the pressing direction (P); as well as A spring (70) abuts between the pressing structure (60) and the support structure (10) and is capable of driving the pressing structure (60) to reset in the opposite direction of the pressing direction (P) by means of an elastic restoring force.

12. The travel switch of claim 11, wherein The support structure (10) includes a support (11), which has a second receiving cavity (111) and a second through hole (112) arranged sequentially and communicating with each other along the pressing direction (P). The pressing structure (60) includes a pressing part (61) and an insertion part (62) arranged sequentially along the pressing direction (P). The insertion part (62) is movably inserted into the second through hole (112) along the pressing direction (P) and the opposite direction of the pressing direction (P). The pressing part (61) is located in the second receiving cavity (111), the spring (70) is disposed between the pressing part (61) and the bottom wall of the second receiving cavity (111), the insertion part (62) is provided with a flange (622) at the front end along the pressing direction (P), and the end of the support (11) can abut against the flange (622) to prevent the pressing structure (60) from disengaging from the support (11) when it resets in the opposite direction of the pressing direction (P).

13. The travel switch of claim 1, wherein The support structure (10) includes a support frame (13). The pressure-bearing structure (20) is movably disposed within the support frame (13) along the pressing direction (P) and the opposite direction of the pressing direction (P). The pressure-bearing structure (20) also includes a second hook (25). The side wall of the support frame (13) has an elongated hole (131) parallel to the pressing direction (P). The second hook (25) is movably embedded in the elongated hole (131) along the pressing direction (P) and the opposite direction of the pressing direction (P) to prevent the pressure-bearing structure (20) from disengaging from the support frame (13) when it resets in the opposite direction of the pressing direction (P).

14. The travel switch of claim 13, wherein, The support structure (10) further includes a support plate (15), the support frame (13) is detachably disposed on the support plate (15), the support plate (15) is a printed circuit board, and the first switch unit (33) is disposed on the support plate (15) and electrically connected to the support plate (15).

15. A medical handling mechanism, characterized by Includes the limit switch as described in any one of claims 1 to 14.

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