Switching device with interlocking protection

Abstract

The utility model provides a switch device with interlocking protection, which comprises a box body, an interlocking assembly and a plurality of switch handles, a slideway is arranged on the box body, the switch handles are rotatably connected to the box body, the switch handles are provided with stop positions, and the plurality of switch handles are arranged at intervals along the extension direction of the slideway; the interlocking assembly is connected to the slide way and can move along the slide way, and the interlocking assembly is used for locking the switch handle at the stop position so as to limit rotation of the switch handle relative to the box body. According to the switch device with interlocking protection, the switch handle can be effectively locked to the stop position, accidental starting of the switch device can be effectively avoided, and the use safety can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground maintenance, and in particular relates to a switch device with interlocking protection. Background Art

[0002] The combination switch for coal mines is the main equipment of the power supply system. The combination switch generally has multiple control circuits that can be put into use. For example, the QJZ2-2000 / 1140(660)-8B type explosion-proof and intrinsically safe combination switch for coal mines has 8 control circuits that can be put into use. When the equipment needs to be repaired, the switch handle needs to be turned to the locked position, and a power-off sign needs to be hung. In addition, a dedicated person is required to supervise to ensure that the equipment will not be accidentally started during the repair process, and the operator can only carry out the repair work.

[0003] However, during the above maintenance process, the switch handle cannot be effectively locked, which leads to dangerous situations such as mis-powering and wrong powering when multiple control circuits are being repaired at the same time. This situation may not only cause personal injury to the operator, but also cause serious accidents such as equipment damage. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the embodiment of the utility model proposes a switch device with interlock protection, which can effectively lock the switch handle to the stop position, effectively avoid accidental start-up of the switch device, and help improve the safety of use.

[0005] The switch device with interlock protection provided by the utility model comprises:

[0006] A box body, wherein a slideway is provided on the box body;

[0007] A plurality of switch handles, the switch handles are rotatably connected to the box body, the switch handles have a stop position, and the plurality of switch handles are arranged at intervals along the extension direction of the slideway;

[0008] An interlocking assembly is connected to the slide and is movable along the slide. The interlocking assembly is used to lock the switch handle in a stop position to limit the switch handle from rotating relative to the box.

[0009] The switch device with interlock protection provided by the utility model moves the interlock component along the slide to the corresponding position of the switch handle so that the interlock component is connected and locked with the switch handle, thereby limiting the rotation of the switch handle relative to the box body. The switch handle can be effectively locked to a stop position, thereby effectively preventing the equipment or circuit from being energized, which helps to improve safety in use.

[0010] In some embodiments, the interlock assembly has a plurality of locking parts, each of which is used to control the locking and unlocking between the interlock assembly and the switch handle;

[0011] And / or, the number of the interlocking assemblies is the same as the number of the switch handles.

[0012] In some embodiments, the interlocking assembly includes a connecting frame and a lock, the connecting frame is slidably connected to the slide, the connecting frame has a locking surface and a locking hole, the switch handle has a clamping portion, and when the interlocking assembly is locked with the switch handle, the lock is installed at the locking hole, and the clamping portion is located between the lock in the locking hole and the locking surface.

[0013] In some embodiments, the connecting frame includes an upper plate, a lower plate and a connecting column, the upper plate and the lower plate are arranged opposite to each other, the two ends of the connecting column are correspondingly connected to the upper plate and the lower plate, the locking surface is the outer peripheral surface of the connecting column, the locking hole is located on the side of the connecting column away from the slide, and the clamping portion is a groove that fits with the locking surface.

[0014] In some embodiments, the switch handle includes a first rod and a second rod, the first rod is rotatably connected to the box, the first rod and the second rod are rotatably connected or telescopically connected, and the clamping portion is provided on the second rod.

[0015] In some embodiments, the lock includes a first plate body, a second plate body and multiple padlocks, the first plate body has a first lock hook and multiple first lock holes, the second plate body has a second lock hook and multiple second lock holes, the first lock holes and the second lock holes are arranged in one-to-one correspondence; the first plate body and the second plate body have a superimposed state and a staggered state, in the superimposed state, the first lock hook and the second lock hook are connected and inserted into the locking hole, and the padlock is installed in the corresponding first lock hole and the second lock hole; in the staggered state, the first lock hook and the second lock hook are disengaged, and the first lock hole and the second lock hole are staggered.

[0016] In some embodiments, a plurality of positioning grooves are provided at intervals on the slide, and the interlocking assembly further comprises a positioning member, which is mounted on the connecting frame. When the interlocking assembly is locked with the switch handle, the positioning member abuts against the positioning groove to fix the interlocking assembly to the slide.

[0017] In some embodiments, the positioning member is configured as a spring plunger;

[0018] And / or, the positioning groove is an annular groove.

[0019] In some embodiments, the interlocking assembly includes a support, a movable rod and a lock, the support is slidably connected to the slide, the movable rod is telescopically connected relative to the support, when the interlocking assembly is locked with the switch handle, the movable rod extends relative to the support, and the lock is connected between the movable rod and the switch handle.

[0020] In some embodiments, a sliding groove is provided on the support, and a push-resistance member is provided on the movable rod. The push-resistance member is slidably arranged in the sliding groove. An elastic member is also arranged between the movable rod and the support. When the applied force acting on the push-resistance member is greater than the deformation force of the elastic member, the push-resistance member can slide along the sliding groove, and the movable rod extends relative to the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view schematic diagram of a switch device with interlock protection provided in an embodiment of the utility model.

[0022] Figure 2 yes Figure 1 The diagram shows a schematic diagram of the structure in which an interlocking assembly in a switch device with interlocking protection locks a switch handle.

[0023] Figure 3 It is a structural schematic diagram of a connecting frame in a switch device with interlocking protection provided in an embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of the structure of a lock in a switch device with interlocking protection in an embodiment of the utility model.

[0025] Figure 5 yes Figure 4 The schematic diagram of the structure in which the first plate body and the second plate body of the switch device with interlocking protection are staggered is shown.

[0026] Figure 6 It is a schematic diagram of the assembly of a support and a movable rod in a switch device with interlocking protection provided in another embodiment of the utility model.

[0027] Reference numerals:

[0028] 1. Box body; 11. Slideway; 111. Positioning groove;

[0029] 2. switch handle; 21. engaging portion; 22. first rod body; 23. second rod body;

[0030] 3. Interlocking assembly; 31. Connecting frame; 311. Locking surface; 312. Locking hole; 313. Upper plate; 314. Lower plate; 315. Connecting column; 316. Sliding hole;

[0031] 32. Lock; 321. First plate; 3211. First lock hook; 3212. First lock hole; 322. Second plate; 3221. Second lock hook; 3222. Second lock hole; 323. Padlock;

[0032] 41. support; 411. cavity; 412. slide groove; 42. movable rod; 421. first locking hole; 422. push member; 43. elastic member. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0034] like Figure 1 and Figure 2 As shown, the utility model provides a switch device with interlock protection, which includes a box body 1, a plurality of switch handles 2 and an interlocking assembly 3. A slideway 11 is provided on the box body 1; the switch handle 2 is rotatably connected to the box body 1, the switch handle 2 has a stop position, and the plurality of switch handles 2 are arranged at intervals along the extension direction of the slideway 11; the interlocking assembly 3 is connected to the slideway 11 and can move along the slideway 11; the interlocking assembly 3 is used to lock the switch handle 2 in the stop position to limit the switch handle 2 from rotating relative to the box body 1.

[0035] Specifically, multiple switch handles 2 can be used to control different circuits or devices, and the switch handles 2 also have a forward position and a reverse position to control the operation of the circuit or device. When the device or circuit is deactivated or overhauled, the corresponding switch handle 2 can be rotated to the stop position to stop the device or circuit; the interlocking component 3 can be moved along the slide 11 to the corresponding position of the switch handle 2, so that the interlocking component 3 is connected and locked with the switch handle 2, thereby limiting the rotation of the switch handle 2 relative to the box 1, which can effectively prevent the switch handle 2 from being rotated to the open position by mistake, and further effectively prevent the device or circuit from being energized, which helps to improve the safety of use.

[0036] In this embodiment, the slide 11 is arranged in the up and down direction. When the interlocking assembly 3 is locked with the switch handle 2, the interlocking assembly 3 moves to the corresponding position of the switch handle 2 in the stop position, and the operator can connect and lock the interlocking assembly 3 and the switch handle 2; after the interlocking assembly 3 is unlocked with the switch handle 2, the interlocking assembly 3 can be moved to the bottom of the slide 11 to facilitate the next use of the interlocking assembly 3 and to facilitate the use and storage of the interlocking assembly 3.

[0037] In some embodiments, the number of interlocking components 3 is the same as the number of switch handles 2. For example, Figure 1The switch device shown has three switch handles 2, which are respectively the first switch handle 2, the second switch handle 2 and the third switch handle 2 from top to bottom. When the second switch handle 2 is in the stop position and needs to be locked, the operator can move the second interlocking assembly 3 to a position corresponding to the second switch handle 2, thereby avoiding the problem that there is no corresponding interlocking assembly 3 or the interlocking assembly 3 is troublesome to adjust when the first switch handle 2 needs to be locked, which helps to improve the comfort of product use.

[0038] In some embodiments, Figure 2 As shown, the interlocking assembly 3 includes a connecting frame 31 and a lock 32. The connecting frame 31 is slidably installed on the slide 11. The connecting frame 31 has a locking surface 311 and a locking hole 312. The switch handle 2 has a clamping portion 21. When the interlocking assembly 3 and the switch handle 2 are locked, the lock 32 is installed at the locking hole 312, and the clamping portion 21 is located between the lock and the locking surface 311 in the locking hole 312, thereby realizing the locking of the interlocking assembly 3 and the switch handle 2.

[0039] Furthermore, if Figure 2 and Figure 3 As shown, the connecting frame 31 includes an upper plate 313, a lower plate 314 and a connecting column 315. The upper plate 313 and the lower plate 314 are arranged opposite to each other. The two ends of the connecting column 315 are correspondingly connected to the upper plate 313 and the lower plate 314. The locking surface 311 is the outer peripheral surface of the connecting column 315. The locking hole 312 is located on the side of the connecting column 315 away from the slide 11. The locking portion 21 is a groove that fits the locking surface 311.

[0040] In this embodiment, a slide bar is provided on the box body 1 to form a slideway 11, and the upper and lower ends of the slide bar are correspondingly fixed to the upper and lower sides of the box body 1. The upper plate 313 and the lower plate 314 are both provided with a sliding hole 316 for the slide bar to pass through, and the sliding hole 316 and the locking hole 312 are respectively located on both sides of the connecting column 315. When the interlocking assembly 3 is locked with the switch handle 2, the groove on the switch handle 2 is fitted to the outer circumference of the connecting column 315, and the lock hook of the lock 32 is inserted into the locking hole 312 to limit the movement of the switch handle 2, thereby fixing the switch handle 2 between the locking hole 312 and the outer circumference of the connecting column 315, and disassembly and assembly are more convenient.

[0041] Optionally, a connecting pipe may be provided between the upper plate 313 and the lower plate 314 to form a sliding hole 316 , so as to reduce the wear of the sliding hole 316 on the sliding rod during the sliding process, thereby helping to extend the service life.

[0042] In some embodiments, Figure 2As shown, the switch handle 2 includes a first rod body 22 and a second rod body 23. The first rod body 22 is rotatably connected to the box body 1. The first rod body 22 and the second rod body 23 are rotatably connected or telescopically connected. The clamping portion 21 is provided on the second rod body 23, so that the length of the switch handle 2 can be adjusted according to the distance between the slide 11 and the rotating axis of the switch handle 2 to ensure that the clamping portion 21 of the switch handle 2 can be connected to the interlocking assembly 3.

[0043] Specifically, the first rod 22 and the second rod 23 are rotatably connected, and a receiving cavity is provided in the first rod 22. The second rod 23 can be flipped relative to the first rod 22 to be moved out or received in the receiving cavity. Optionally, the groove can be provided on the side of the second rod 23 away from the inner wall of the receiving cavity, so that the groove can be attached to the outer peripheral surface of the connecting column 315.

[0044] In some embodiments, Figure 2 , Figure 4 and Figure 5 As shown, the interlocking assembly 3 has a plurality of locking parts, each of which is used to control the locking and unlocking between the interlocking assembly 3 and the switch handle 2. During the equipment or circuit maintenance process, multiple operators can control different locking parts accordingly. When the switch handle 2 needs to be unlocked, multiple operators need to open the corresponding locking parts to unlock the switch handle 2, thereby realizing simultaneous supervision by multiple people and effectively avoiding the occurrence of mis-powering.

[0045] In some embodiments, the lock 32 includes a first plate 321, a second plate 322, and a plurality of padlocks 323. The first plate 321 has a first lock hook 3211 and a plurality of first lock holes 3212. The second plate 322 has a second lock hook 3221 and a plurality of second lock holes 3222. The first lock holes 3212 and the second lock holes 3222 are arranged in a one-to-one correspondence. The first plate 321 has an overlapping state and a staggered state relative to the second plate 322. In the overlapping state, the first lock hook 3211 and the second lock hook 3221 are connected and penetrated in the lock hole 312, and the padlock 323 is installed in the corresponding first lock hole 3212 and the second lock hole 3222; in the staggered state, the first lock hook 3211 and the second lock hook 3221 are disengaged, and the first lock hole 3212 and the second lock hole 3222 are staggered.

[0046] Specifically, the first plate body 321, the second plate body 322 and multiple padlocks 323 cooperate to form the locking portion, the first plate body 321 and the second plate body 322 are hinged, the first plate body 321 can rotate relative to the second plate body 322, in the overlapped state, the first plate body 321 and the second plate body 322 at least partially overlap, the first lock hook 3211 and the second lock hook 3221 are connected, and the first lock hook 3211 or the second lock hook 3221 is inserted into the locking hole 312 to lock the connecting frame 31 and the switch handle 2, the first lock hole 3212 and the second lock hole 3222 coincide with each other, and the padlock 323 can be installed in the first lock hole 3212 and the second lock hole 3222 to lock the connection between the first lock hook 3211 and the second lock hook 3221.

[0047] It should be noted that the number of the first lock hole 3212, the second lock hole 3222 and the padlock 323 can be set as needed, and the number of the first lock hole 3212 and the second lock hole 3222 is the same, and the number of the padlock 323 is less than or equal to the number of the first lock hole 3212 or the second lock hole 3222. For example, the first lock hole 3212 can be set to 4, 5, 6 or 8, etc., and the corresponding padlock 323 can be set to 3, 4, 5 or 7, etc.

[0048] In some embodiments, Figure 1 and Figure 2 As shown, a plurality of positioning grooves 111 are arranged at intervals on the slide 11 ; the interlocking assembly 3 also includes a positioning member, which is installed on the connecting frame 31 . When the interlocking assembly 3 is locked with the switch handle 2 , the positioning member abuts against the positioning groove 111 to fix the interlocking assembly 3 to the slide 11 .

[0049] Further, the positioning groove 111 can be set as an annular groove, and when the positioning member abuts in the positioning groove 111, the interlocking assembly 3 can rotate relative to the slideway 11. Optionally, the positioning member can be set as a spring plunger, and the abutting end of the positioning member slides more smoothly with the slide rod, and the adjustment and movement are more convenient.

[0050] Specifically, the positioning grooves 111 can be arranged at intervals on the slide bar, and the positioning piece can be installed on the connecting frame 31. When the switch handle 2 needs to be locked, the connecting frame 31 can be moved to the corresponding positioning groove 111, the positioning piece abuts against the positioning groove 111, and the connecting frame 31 can rotate around the slide bar to adjust the angle, so as to facilitate the connection of the switch handle 2 and further facilitate the locking of the switch handle 2.

[0051] Optionally, a through hole may be provided on the connecting tube between the upper plate 313 and the lower plate 314, and a positioning member may be installed on the upper plate 313 and / or the lower plate 314. The positioning member may be passed through the through hole to abut against the positioning groove 111 on the sliding rod to fix the interlocking assembly 3 to the sliding rod.

[0052] In another embodiment of the present invention, Figure 6 As shown, the interlocking assembly 3 includes a support 41, a movable rod 42 and a lock 32. The support 41 is slidably connected to the slideway 11, and the movable rod 42 is telescopically connected relative to the support 41. When the interlocking assembly 3 is locked with the switch handle 2, the movable rod 42 extends relative to the support 41, and the lock 32 is connected between the movable rod 42 and the switch handle 2. It should be noted that the lock 32 provided in this embodiment can have the same structure as the lock 32 in the above embodiment, which will not be repeated here.

[0053] Furthermore, a slide groove 412 is provided on the support 41, and a push piece 422 is provided on the movable rod 42. The push piece 422 is slidably arranged in the slide groove 412. An elastic piece 43 is also arranged between the movable rod 42 and the support 41. When the applied force acting on the push piece 422 is greater than the deformation force of the elastic piece 43, the push piece 422 can slide along the slide groove 412, and the movable rod 42 extends relative to the support 41.

[0054] In this embodiment, a cavity 411 is provided in the support 41, the movable rod 42 and the elastic member 43 are installed in the cavity 411, the slide groove 412 is provided on the side wall of the cavity 411 and can make the cavity 411 communicate with the outside, the push member 422 is provided in the slide groove 412 and exposed to the outside, and the operator can push the push member 422 to move along the slide groove 412 so that the movable rod 42 extends out of the cavity 411 of the support 41. And when the applied force applied to the push member 422 is less than the deformation force of the elastic member 43, under the deformation force of the elastic member 43, the movable rod 42 can be retracted into the cavity 411 of the support 41.

[0055] Furthermore, a first locking hole 421 is provided on the movable rod 42, and a second locking hole is provided on the switch handle 2. When the switch handle 2 needs to be locked, the operator can move the support 41 to the corresponding position along the slide 11, and then move the movable rod 42 out of the cavity 411 of the support 41 through the push piece 422. The lock hook of the lock 32 can be inserted into the first locking hole 421 and the second locking hole, thereby realizing the locking connection between the switch handle 2 and the interlocking assembly 3.

[0056] In the description of the present invention, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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 the present invention can be understood according to specific circumstances.

[0059] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0060] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A switch device with interlock protection, characterized in that: It includes a box body, an interlocking assembly and multiple switch handles, wherein the box body is provided with a slide; the switch handle is rotatably connected to the box body, the switch handle has a stop position, and multiple switch handles are arranged at intervals along the extension direction of the slide; the interlocking assembly is connected to the slide and is movable along the slide, and the interlocking assembly is used to lock the switch handle in the stop position to limit the rotation of the switch handle relative to the box body.

2. The switch device with interlock protection according to claim 1, characterized in that: The interlocking assembly has a plurality of locking parts, each of which is used to control the locking and unlocking between the interlocking assembly and the switch handle; And / or, the number of the interlocking assemblies is the same as the number of the switch handles.

3. The switch device with interlock protection according to claim 2, characterized in that: The interlocking assembly includes a connecting frame and a lock, the connecting frame is slidably connected to the slideway, the connecting frame has a locking surface and a locking hole, the switch handle has a clamping portion, when the interlocking assembly is locked with the switch handle, the lock is installed at the locking hole, and the clamping portion is located between the lock in the locking hole and the locking surface.

4. The switch device with interlock protection according to claim 3, characterized in that: The connecting frame includes an upper plate, a lower plate and a connecting column, the upper plate and the lower plate are arranged opposite to each other, the two ends of the connecting column are correspondingly connected to the upper plate and the lower plate, the locking surface is the outer peripheral surface of the connecting column, the locking hole is located on the side of the connecting column away from the slide, and the clamping portion is a groove that fits with the locking surface.

5. The switch device with interlock protection according to claim 3, characterized in that: The switch handle comprises a first rod body and a second rod body, the first rod body is rotatably connected to the box body, the first rod body and the second rod body are rotatably connected or telescopically connected, and the clamping portion is arranged on the second rod body.

6. The switch device with interlock protection according to claim 3, characterized in that: The lock comprises a first plate, a second plate and a plurality of padlocks, the first plate having a first lock hook and a plurality of first lock holes, the second plate having a second lock hook and a plurality of second lock holes, the first lock holes and the second lock holes being arranged in one-to-one correspondence; the first plate and the second plate have an overlapping state and a staggered state, in the overlapping state, the first lock hook and the second lock hook are connected and penetrated in the locking hole, and the padlock is installed in the corresponding first lock hole and the second lock hole; in the staggered state, the first lock hook and the second lock hook are disengaged, and the first lock hole and the second lock hole are staggered.

7. The switch device with interlock protection according to claim 3, characterized in that: A plurality of positioning grooves are arranged at intervals on the slideway, and the interlocking assembly further comprises a positioning member, which is mounted on the connecting frame. When the interlocking assembly is locked with the switch handle, the positioning member abuts against the positioning groove to fix the interlocking assembly to the slideway.

8. The switch device with interlock protection according to claim 7, characterized in that: The positioning member is configured as a spring plunger; And / or, the positioning groove is an annular groove.

9. The switch device with interlock protection according to claim 1, characterized in that: The interlocking assembly includes a support, a movable rod and a lock. The support is slidably connected to the slideway, and the movable rod is telescopically connected relative to the support. When the interlocking assembly is locked with the switch handle, the movable rod extends relative to the support, and the lock is connected between the movable rod and the switch handle.

10. The switch device with interlock protection according to claim 9, characterized in that: A sliding groove is provided on the support, and a push-pull piece is provided on the movable rod. The push-pull piece is slidably arranged in the sliding groove. An elastic piece is also arranged between the movable rod and the support. When the applied force acting on the push-pull piece is greater than the deformation force of the elastic piece, the push-pull piece can slide along the sliding groove, and the movable rod extends relative to the support.

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