Manual pull rope type film changing device for underground coal mine camera

Abstract

The invention relates to the field of coal mine auxiliary equipment, discloses a manual pull rope type film changing device for an underground coal mine camera, and belongs to the technical field of coal mine auxiliary equipment. The device comprises two sets of storage assemblies arranged on the two sides of the camera, a lens film connected between collection shafts in the two storage assemblies, and a driving assembly arranged above the storage assembly on the winding side. A one-way limiting mechanism is arranged in the storage assembly, and the driving assembly comprises a rotating shaft, a driving rope and a volute spiral spring. The outer wall of the driving rope is in friction connection with a sliding plate with a locking block, when the driving rope is pulled, the sliding plate moves preferentially to unlock the rotating shaft, and then the collecting shaft is driven to rotate to change the film; and after loosening, automatic resetting and locking are realized. A resistance adjusting mechanism is arranged in the feeding side storage assembly, and the lens film is tensioned and then rolled by adjusting rotation resistance. A pure mechanical structure is adopted, electric driving is not needed, the automatic anti-loosening and tensioning functions are achieved, and the device is suitable for being used in the underground high-dust environment.

Description

Technical Field

[0001] This invention relates to the field of coal mine auxiliary equipment technology, specifically to a manual rope-operated membrane replacement device for underground coal mine cameras. Background Technology

[0002] The working environment underground in coal mines is harsh, with large amounts of coal dust and rock powder suspended in the air. Dust easily accumulates on the lens surface of surveillance cameras, severely affecting the clarity and security of the monitored images. To solve this problem, the industry commonly uses a method of installing a transparent protective film in front of the lens and periodically replacing the film with a winding mechanism to maintain a clear field of view.

[0003] Existing automatic membrane changing devices mostly rely on electric motors. However, the use of electrical equipment is strictly limited in the highly explosive environment of underground coal mines, characterized by high levels of gas and coal dust. Electric motor drives not only require expensive explosion-proof enclosures and complex control circuits, increasing the size and maintenance difficulty of the equipment, but also make them difficult to deploy in passive areas or confined spaces where wiring is challenging. Therefore, purely mechanical drive devices that require no electricity are more suitable for the actual working conditions underground.

[0004] However, existing manual or rope-operated mechanical film changing devices still have structural defects in practical applications. On the one hand, due to the continuous and intense vibrations generated during the operation of underground mining equipment, existing rope-driven mechanisms often lack effective automatic locking and anti-loosening mechanisms. In non-operating states, the drive shaft is prone to accidental rotation due to vibration, leading to the drive rope becoming loose, tangled, or even jammed, making subsequent film changing operations impossible. On the other hand, existing film roll structures are mostly simple winding wheel combinations, lacking effective control over the tension of the lens film. During the film changing process, if the resistance on the feeding side is less than the tension on the winding side or the resistance is unstable, the lens film is prone to being loose or wrinkled when passing in front of the camera, causing image distortion or obstruction of the field of view, failing to achieve the expected cleaning effect. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a manual rope-operated membrane replacement device for underground coal mine cameras, which solves the problems of difficult lens cleaning and cumbersome membrane replacement operations in the high-dust environment of underground coal mines.

[0006] To achieve the above objectives, the present invention provides a manual cable-operated lens film replacement device for underground coal mine cameras. The device includes two sets of storage components disposed on the left and right sides of the camera, a lens film connected between collection shafts within the two sets of storage components, and a drive component disposed above one set of storage components. One set of storage components stores used lens films, while the other set stores unused lens films. The drive component is positioned above the set of storage components storing used lens films and drives the collection shaft on that side to rotate, thereby moving the lens film to complete the replacement operation.

[0007] The storage assembly includes a storage box fixed to the outer wall of the camera. A limiting wheel is rotatably connected to the inner wall of the storage box, and a drive shaft is fixedly connected below the limiting wheel. The collection shaft is sleeved on the outer wall of the drive shaft, and the two are circumferentially fixed and rotate synchronously via a spline. A replacement plate is inserted into the opening at the bottom of the storage box. The replacement plate engages with an elastic buckle fixed to the inner wall of the storage box via a slot, allowing for the closure and opening of the bottom of the storage box, facilitating the replacement of the collection shaft.

[0008] To limit the rotation direction of the limiting wheel, a limiting groove is formed on the outer wall of the limiting wheel, and a slider is slidably mounted on the inner wall of the storage box. The slider has a trapezoidal protrusion that matches the limiting groove. The slider is connected to the inner wall of the storage box by a support spring. The elastic force of the support spring keeps the protrusion in contact with the surface of the limiting wheel, thus limiting the limiting wheel to rotate only in the winding direction.

[0009] The drive assembly includes a rotating shaft, a drive rope, and a reset mechanism. The rotating shaft is mounted above the limiting wheel via a one-way bearing, which is configured to allow the rotating shaft to drive the limiting wheel to rotate only in the winding direction. The drive rope is wound and fixed to the outer wall of the rotating shaft, and the top of the rotating shaft is connected to an external protective sleeve via a spiral spring. When the drive rope is pulled, the rotating shaft rotates and drives the limiting wheel to rotate; after the tension is released, the spiral spring releases its elastic potential energy, causing the rotating shaft to reset in the opposite direction. At this time, the one-way bearing rotates freely, and the limiting wheel remains stationary.

[0010] The drive assembly also includes an anti-misrotation structure. A sliding plate is fitted onto the outer wall of the drive rope, and the sliding plate is frictionally connected to the drive rope via a rubber sleeve. A locking block is located on the side of the sliding plate near the rotating shaft, and a corresponding locking groove is provided on the outer wall of the rotating shaft. When the drive rope is pulled, the sliding plate, under the action of friction, displaces before the rotating shaft, causing the locking block to disengage from the locking groove, releasing the locking of the rotating shaft. Subsequently, the drive rope drives the rotating shaft to rotate. When the drive rope is released, the rotating shaft rotates back to its original position under the action of the spiral spring and winds up the drive rope. The sliding plate moves in the opposite direction under the action of friction, causing the locking block to re-insert into the locking groove, achieving automatic locking after reset.

[0011] A set of storage components for storing unused lens film includes a resistance adjustment mechanism. This mechanism includes a pressing block sliding against the inner wall of the storage box and an adjusting screw connected to the pressing block. A support spring is located between the slider and the pressing block. Rotating the adjusting screw moves the pressing block, changing the compression of the support spring and thus adjusting the pressure of the protrusion on the limiting wheel. This design ensures that the rotational resistance on the unused lens film side is greater than that on the used side. During operation, a slight pull on the drive rope only rotates the collection side, tightening the slack lens film; continued force overcomes the resistance, causing both sides to rotate synchronously for film replacement.

[0012] In addition, a limiting sleeve is fixed to the front surface of the camera. The limiting sleeve has an L-shaped cross-section and wraps around the outer wall of the lens film. It is used to guide the lens film and prevent the edges from lifting, thereby reducing the entry of dust.

[0013] This invention provides a manual rope-operated membrane replacement device for underground coal mine cameras. It has the following advantages:

[0014] 1. This invention adopts a purely mechanical drive structure, using a drive rope in conjunction with a spiral spring and a one-way bearing to achieve power input and reset. This design requires no power supply, avoiding the potential spark hazards that electrical equipment may generate in the high-gas, high-dust environment of underground coal mines. It also eliminates the maintenance costs of explosion-proof circuits and is suitable for special working conditions in underground environments with passive or strict explosion-proof requirements.

[0015] 2. This invention utilizes the frictional engagement between the drive rope and the sliding plate to achieve automatic locking and unlocking of the drive assembly. When the drive rope is pulled, the sliding plate uses friction to preferentially displace and release the lock on the rotating shaft; after the drive rope is released, the sliding plate rotates back to its original position and re-engages in the locking groove. This structure prevents the rotating shaft from rotating arbitrarily due to external vibration or accidental contact when not in operation, and avoids the drive rope from becoming loose or tangled during the reset process.

[0016] 3. This invention incorporates a resistance adjustment mechanism on the side where unused lens film is stored. By adjusting the screw, the compression of the support spring is changed, making the rotational resistance on the feeding side greater than the initial resistance on the winding side. During film replacement, this resistance difference causes the lens film to be initially taut under tension before moving, eliminating the impact of lens film slack or wrinkles on camera image quality and ensuring neat winding. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional disassembled schematic diagram of the present invention; Figure 3 This is a cross-sectional schematic diagram of the storage box of the present invention; Figure 4 For the present invention Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 This is a rear view schematic diagram of the skateboard of the present invention; Figure 6 This is a schematic diagram of the extrusion block of the present invention.

[0018] The components are as follows: 1. Camera; 2. Limiting sleeve; 3. Storage component; 31. Storage box; 32. Material changing plate; 33. Buckle; 34. Slot; 35. Support spring; 36. Limiting wheel; 37. Drive shaft; 38. Slider; 39. Protrusion; 310. Limiting groove; 311. Adjusting screw; 312. Extrusion block; 4. Drive component; 41. Protective sleeve; 42. Drive rope; 43. Rotating shaft; 44. Spiral spring; 45. Slide plate; 46. Locking block; 47. Locking groove; 5. Collection shaft; 6. Lens film. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Please see the appendix Figure 1 - Appendix Figure 6This invention provides a manual rope-operated lens film changing device for a coal mine underground camera, applied to a camera 1. It includes a storage component 3, of which two sets are arranged parallel to each other on the left and right sides of the camera 1. One set of storage components 3 stores used lens films 6, and the other set stores unused lens films 6. A collection shaft 5 is installed inside each storage component 3, and the two sets of collection shafts 5 are connected to each other via the lens films 6. When one set of collection shafts 5 rotates, it pulls the other set of collection shafts 5 to rotate via the lens films 6, thus enabling the film changing operation. A drive component 4 is installed above the set of storage components 3 used to store used lens films 6, allowing the operator to control the movement of the storage components 3.

[0021] Storage component 3 includes storage box 31, which is a hollow box with an opening at the bottom. Storage box 31 is fixedly connected to the outer wall of camera 1 to provide support for the overall storage component 3. Limiting wheel 36 is rotatably connected to the inner wall of storage box 31. Drive shaft 37 is fixedly connected to the lower surface of limiting wheel 36. When limiting wheel 36 rotates, it drives drive shaft 37 to rotate synchronously. Collection shaft 5 is sleeved on the outer wall of drive shaft 37 from bottom to top. Spline is provided on the outer wall of drive shaft 37. 7. When rotating, the spline can drive the collecting shaft 5 to rotate synchronously. When the collecting shaft 5 needs to be replaced, it can be pulled down to disengage it from the outer wall of the drive shaft 37. A material changing plate 32 is inserted into the lower surface of the storage box 31. The material changing plate 32 can close the opening at the bottom of the storage box 31 to prevent the collecting shaft 5 from falling from below. A buckle 33 is fixedly connected to the inner wall of the storage box 31. The buckle 33 is L-shaped and made of elastic plastic. It will undergo elastic deformation when squeezed. The upper surface of the material changing plate 32... The surface is provided with a slot 34 that matches the buckle 33. When the lower end of the buckle 33 is inserted into the slot 34, the material changing plate 32 will be fixed and will not move back and forth at will. When the operator pushes the material changing plate 32, the material changing plate 32 can squeeze the buckle 33 through the slot 34, forcing it to deform and leave the slot 34. Then the material changing plate 32 can be removed. The outer wall of the limiting wheel 36 is provided with a limiting groove 310. The inner wall of the storage box 31 is slidably connected to a slider 38. The slider 38 is positioned on the side near the limiting groove 310. There is a protrusion 39 that matches the limiting groove 310. The protrusion 39 is trapezoidal, so it can restrict the limiting wheel 36 to rotate only in one direction. In this embodiment, the limiting wheel 36 is restricted by the protrusion 39 to rotate only counterclockwise. If the limiting wheel 36 tries to rotate clockwise, it will be blocked by the protrusion 39 and cannot rotate. The slider 38 is elastically connected to the inner wall of the storage box 31 by the support spring 35. The support spring 35 will push the slider 38 at all times to prevent the protrusion 39 from arbitrarily leaving the inside of the limiting groove 310.

[0022] The drive assembly 4 includes a rotating shaft 43, which is rotatably connected to the upper surface of the limiting wheel 36 via a one-way bearing. In this embodiment, the one-way bearing is configured to allow the rotating shaft 43 to drive the limiting wheel 36 to rotate counterclockwise only. When the rotating shaft 43 rotates clockwise, it cannot drive the limiting wheel 36 to rotate. A drive rope 42 is fixed to and wound around the outer wall of the rotating shaft 43. Pulling the drive rope 42 will drive the rotating shaft 43 to rotate. The drive rope 42 is an elastic rope with a certain degree of elasticity, and it can stretch and shorten by its own elasticity during use. The top end of the rotating shaft 43 is elastically connected to the inner wall of the protective sleeve 41 via a spiral spring 44. When the operator stops pulling the drive rope 42, the spiral spring 44 can drive the rotating shaft 43 to rotate and reset through its own elastic deformation. Since the rotating shaft 43 and the limiting wheel 36 are connected via a one-way bearing, the rotating shaft 43 will not drive the limiting wheel 36 to rotate back when it rotates and resets. A sliding plate 45 is sleeved on the outer wall of the drive rope 42. The sliding plate 45 is connected to the drive rope 42 via a rubber sleeve. The components are interconnected. Therefore, when the drive rope 42 moves back and forth, it can drive the slide plate 45 to move through the friction between it and the rubber sleeve. A locking block 46 is provided on the side of the slide plate 45 near the rotating shaft 43. The outer wall of the rotating shaft 43 is provided with a locking groove 47 that matches the locking block 46. The locking block 46 is rectangular. Therefore, when the locking block 46 is inserted into the locking groove 47, the rotating shaft 43 will be restricted from rotating. When the operator pulls the drive rope 42, the drive rope 42 will drive the slide plate 45 to move forward. The forward movement of the slide plate 45 will cause the locking block 46 to disengage from the locking groove 47, thus unlocking the rotating shaft 43. When the operator releases the drive rope 42, the rotating shaft 43 will rotate and cause the drive rope 42 to rewind around the outer wall of the rotating shaft 43. At the same time, the drive rope 42 will drive the slide plate 45 to move backward, thereby causing the locking block 46 to re-insert into the locking groove 47, thus relocking the rotating shaft 43 and preventing the rotating shaft 43 from rotating arbitrarily.

[0023] In one storage assembly 3 without a drive component 4, a compression block 312 is installed inside. The compression block 312 slides on the inner wall of the storage box 31 in this storage assembly 3. In this storage assembly 3, a support spring 35 is installed at the middle position between the slider 38 and the compression block 312. An adjusting screw 311 is rotatably connected to the outer wall of the compression block 312. The adjusting screw 311 passes through and is threadedly connected to the inner wall of the storage box 31. By rotating the adjusting screw 311, the compression block 312 is moved closer to the slider 38, thus compressing the support spring 35 and causing it to deform. By changing the initial deformation length of the support spring 35, the deformation length of the support spring 35 can be controlled. The initial output pressure further increases the resistance to the rotation of the limit wheel 36. With this setting, when the operator slightly pulls the material changing plate 32, the material changing plate 32 can only drive one set of storage components 3 on one side of the camera 1 to roll up, thus pulling the lens film 6 to straighten it and achieve a tensioning effect. Only when the operator continues to apply force will the two sets of limit wheels 36 rotate synchronously, thereby realizing the roll changing operation. The front surface of the camera 1 is fixedly connected to the limit sleeve 2. The cross-section of the limit sleeve 2 is set to L-shaped. It wraps around the outer wall of the lens film 6, which can prevent the lens film 6 from curling up during use and further reduce the probability of dust contacting the camera 1.

[0024] Working principle: Before using this device, the operator moves the material changing plate 32 to cause the slot 34 to squeeze the buckle 33 to deform and disengage. After removing the material changing plate 32, the two sets of collection shafts 5 wrapped with lens film 6 are respectively installed into the storage box 31 and sleeved on the spline of the drive shaft 37. Then the material changing plate 32 is put back to complete the sealing. At this time, the limiting sleeve 2 wraps the lens film 6.

[0025] During the film replacement operation, pulling the drive rope 42 outward causes the slide plate 45, which is attached to the drive rope 42, to shift under friction, thus disengaging the locking block 46 from the locking groove 47 and releasing the lock on the rotating shaft 43. Subsequently, the drive rope 42 drives the rotating shaft 43 to rotate counterclockwise against the resistance of the spiral spring 44, which in turn drives the limit wheel 36 and the collecting shaft 5 to rotate via the one-way bearing to wind up the lens film 6. After releasing the drive rope 42, the spiral spring 44 drives the rotating shaft 43 to rotate back to its original position, and the one-way bearing rotates freely, keeping the limit wheel 36 stationary. At the same time, the slide plate 45 moves in the opposite direction with the drive rope 42, causing the locking block 46 to re-insert into the locking groove 47 to achieve automatic locking.

[0026] To ensure the tension of the lens film 6, the adjusting screw 311 inside the feeding-side storage assembly 3 is rotated to push the extrusion block 312, compressing the support spring 35 to increase the pressure of the protrusion 39 on the limiting wheel 36, making the rotational resistance on the feeding side greater than the initial resistance on the winding side. When the drive assembly 4 is working, the tension first straightens the slack part of the lens film 6. After overcoming the resistance, the two collecting shafts 5 on both sides rotate synchronously to complete the film replacement. With the guiding effect of the limiting sleeve 2, the lens film 6 is effectively prevented from curling or loosening during use.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manual rope-operated membrane replacement device for underground coal mine cameras, applied to camera (1), characterized in that, include: Storage component (3), lens film (6) and drive component (4); The storage components (3) are provided in two sets, which are arranged in parallel on the left and right sides of the camera (1). One set of the storage components (3) is used to store the lens film (6) after use, and the other set of the storage components (3) is used to store the lens film (6) that has not been used. The storage component (3) is provided with a collection shaft (5) inside, and the collection shafts (5) inside the two sets of storage components (3) are connected to each other through the lens film (6); The drive assembly (4) is positioned above a set of storage assemblies (3) for storing the used lens film (6) and is used to drive the collection shaft (5) inside the set of storage assemblies (3) to rotate.

2. The manual rope-operated membrane replacement device for underground coal mine cameras according to claim 1, characterized in that, The storage component (3) includes a storage box (31), a limiting wheel (36), and a drive shaft (37). The storage box (31) is fixedly connected to the outer wall of the camera (1), the limiting wheel (36) is rotatably connected to the inner wall of the storage box (31), and the transmission shaft (37) is fixedly connected to the lower surface of the limiting wheel (36). The collecting shaft (5) is sleeved on the outer wall of the transmission shaft (37) from bottom to top. The outer wall of the transmission shaft (37) is provided with a spline. The collecting shaft (5) rotates synchronously with the transmission shaft (37) through the spline.

3. The manual rope-operated membrane replacement device for underground coal mine cameras according to claim 2, characterized in that, The outer wall of the limiting wheel (36) is provided with a limiting groove (310), and the inner wall of the storage box (31) is slidably connected with a slider (38). The slider (38) is provided with a protrusion (39) that is adapted to the limiting groove (310) on the side near the limiting groove (310). The protrusion (39) is trapezoidal to restrict the unidirectional rotation of the limiting wheel (36); the slider (38) is elastically connected to the inner wall of the storage box (31) by a support spring (35).

4. The manual rope-pulling membrane replacement device for underground coal mine cameras according to claim 2, characterized in that, The drive assembly (4) includes a rotating shaft (43), a drive rope (42), a protective sleeve (41), and a spiral spring (44). The rotating shaft (43) is rotatably connected to the upper surface of the limiting wheel (36) via a one-way bearing, the one-way bearing being configured to allow only the rotating shaft (43) to drive the limiting wheel (36) to rotate in the winding direction; The drive rope (42) is fixed and wound around the outer wall of the shaft (43), and the drive rope (42) is an elastic rope; the top end of the shaft (43) is elastically connected to the inner wall of the protective sleeve (41) through the spiral spring (44).

5. A manual rope-operated membrane replacement device for underground coal mine cameras according to claim 4, characterized in that, The outer wall of the drive rope (42) is fitted with a slide plate (45), which is connected to the drive rope (42) through a rubber sleeve and moves with the drive rope (42) by friction. A locking block (46) is provided on the side of the sliding plate (45) near the pivot (43), and a locking groove (47) adapted to the locking block (46) is provided on the outer wall of the pivot (43). When the drive rope (42) is pulled, the slide plate (45) moves forward, causing the locking block (46) to disengage from the locking groove (47); when the drive rope (42) is released, the slide plate (45) moves backward, causing the locking block (46) to insert into the locking groove (47).

6. The manual rope-pulling membrane replacement device for underground coal mine cameras according to claim 3, characterized in that, In a set of storage components (3) for storing unused lens film (6), the storage box (31) is provided with a compression block (312) and an adjusting screw (311). The extrusion block (312) is slidably connected to the inner wall of the storage box (31), and the support spring (35) is installed between the slider (38) and the extrusion block (312); The adjusting screw (311) passes through and is threaded to the inner wall of the storage box (31) and is rotatably connected to the outer wall of the pressing block (312) for adjusting the deformation length of the support spring (35) by pushing the pressing block (312).

7. A manual rope-operated membrane replacement device for underground coal mine cameras according to claim 2, characterized in that, The storage box (31) has an opening on its lower surface and a material exchange plate (32) is inserted into it. The inner wall of the storage box (31) is fixedly connected with an L-shaped buckle (33), which is made of elastic material; the upper surface of the material changing plate (32) is provided with a slot (34) that matches the buckle (33).

8. The manual rope-operated membrane replacement device for underground coal mine cameras according to claim 1, characterized in that, The front surface of the camera (1) is fixedly connected to a limiting sleeve (2), the limiting sleeve (2) has an L-shaped cross section and wraps around the outer wall of the lens film (6).

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