A speed limiting device for a descent protector

Abstract

The present invention relates to a speed limiting device for a descent protector, comprising an access shaft with a gear, a one-way bearing, a movable core block, a centrifugal block, a friction block and a shell; the movable core block is positioned on the access shaft through a one-way bearing, and the movable core block is driven to rotate in one direction by the access shaft; the centrifugal block is positioned on the movable core block, and the friction block is locked on the outer edge of the centrifugal block, and can resist the inner surface of the shell to form friction; it is characterized in that: more than two centrifugal blocks are positioned on the movable core block through front and rear fixing plates, and can move radially relative to the movable core block, and the radial contraction trend is maintained by a spring. The present invention is ingenious in conception, reasonable in design, and has the characteristics of speed limiting protection; in particular, the centrifugal block cooperates with the spring, and the friction force increases as the descent speed increases, which not only plays a role in descent speed limiting protection, but also reduces resistance at low speeds and reduces equipment friction losses.

Description

Technical field:

[0001] The invention belongs to the field of protective equipment for rock climbing or aerial work, and in particular relates to a speed limiting device for a descent protector, in particular a centrifugal block with a retraction function. Background technology:

[0002] Patent application number: CN201821674697.0, discloses a multifunctional self-recovering descent protector, including a shell and a speed control mechanism, a transmission mechanism, a rope mechanism and a self-recovering mechanism arranged in the shell. The speed control mechanism is connected to the rope mechanism through the transmission mechanism, and the rope mechanism is connected to the self-recovering mechanism; the speed control mechanism includes a first speed control mechanism and a second speed control mechanism.

[0003] Among them, the first speed control mechanism includes a friction wheel body, a friction block and a one-way bearing connected to the friction wheel body, and the one-way bearing controls the friction wheel body to make unidirectional movement; a plurality of arc-shaped slots arranged at equal intervals in the circumferential direction are provided on the edge of the friction wheel body, and the friction block is fixed in the slot, and shock-absorbing columns are embedded at both ends of the friction block; the second speed control mechanism includes a recovery resistance ring and a recovery resistance block, and the recovery resistance block is fixedly connected to the recovery resistance ring through a cylindrical pin.

[0004] The speed control center shaft in the transmission mechanism is fixed with a recovery resistance ring, a one-way bearing and a small gear in sequence from left to right; the small gear is meshed with the large gear, and the large gear is fixed on the rope mechanism; the rope mechanism includes a main disk and a rope wound on the main disk, the main disk is arranged in the main housing, the main disk is connected to the main shaft through a bearing, and the two ends of the main shaft are respectively fixed on the side walls of the main housing; the self-recovery mechanism includes a coil spring bottom plate, a coil spring inner sleeve, a coil spring and a coil spring cover plate, the coil spring bottom plate is fixed on the main disk, the coil spring inner sleeve is sleeved on the main shaft, the coil spring is connected to the coil spring inner sleeve, and the coil spring cover plate is fixed to the main shaft through a coil spring cover plate retaining ring.

[0005] The friction wheel body in the mechanism is an integral wheel structure, and the friction block arranged in the slot always keeps friction with the speed control mechanism housing to maintain a constant friction force without matching the descending speed. Summary of the invention:

[0006] The purpose of the present invention is to design a descent protector speed limiting device with a spring arranged on a centrifugal block, which reduces the friction force when descending at a low speed.

[0007] The technical solution of the present invention is achieved in this way:

[0008] A speed limiting device for a descent protector comprises an access shaft with a gear, a one-way bearing, a movable core block, a centrifugal block, a friction block and a shell; the movable core block is positioned on the access shaft through the one-way bearing, and the movable core block is driven to rotate in one direction by the access shaft; the centrifugal block is positioned on the movable core block, and the friction block is locked on the outer edge of the centrifugal block and can resist the inner surface of the shell to form friction; it is characterized in that: more than two centrifugal blocks are positioned on the movable core block through front and rear fixing plates, and can make radial movement relative to the movable core block, and the radial contraction trend is maintained by a spring.

[0009] There are two centrifugal blocks, which are symmetrically distributed on the outside of the movable core block. Slots or long slots parallel to each other are opened at both ends of the centrifugal blocks. They are positioned on the movable core block with the help of front and rear fixing plates and bolt pins. The centrifugal blocks are driven to rotate by the movable core block, and can be radially opened under the action of centrifugal force. The spring driving the contraction action is a tension spring, which is arranged between the two ends of the two centrifugal blocks to form a pulling trend to overcome the centrifugal force.

[0010] There are more than three centrifugal blocks, which are rotationally symmetrically distributed on the outside of the movable core block. Each centrifugal block is provided with a radial long slot hole, which is positioned on the movable core block with the help of front and rear fixing plates and bolt pins. The centrifugal blocks are driven to rotate by the movable core block, and can be radially opened under the action of centrifugal force; the spring driving the contraction action is a tension spring, and the tension spring is arranged in one of the following structures: 1. The two ends of the tension spring are respectively suspended between the end faces of adjacent centrifugal blocks; 2. The two ends of the tension spring are respectively suspended between the centrifugal block and the movable core block.

[0011] A radial pin is also arranged on the circumference of the movable core block, and the end of the radial pin can abut against the inner arc surface of the centrifugal block.

[0012] The movable core block is also provided with a one-way tooth on one side circumference of the one-way bearing; a keyway is radially penetrated on the access shaft covered by the one-way tooth, and a sliding key is provided in the keyway, and the sliding key can be hung on the one-way tooth in the locking direction of the one-way bearing.

[0013] The sliding key is a rectangular structure, and the rear corners corresponding to the locking direction are rounded.

[0014] The movable core block is also provided with a one-way groove on one side circumference of the one-way bearing, and a roller is provided between the access shaft covered by the one-way groove. The roller can enter the one-way groove and be stuck between the access shaft and the movable core block in the stuck direction of the one-way bearing.

[0015] The housing is embedded with a friction ring, which contacts the friction block.

[0016] The front and rear fixing plates are processed with corresponding and matching non-circular matching parts on the front and rear ends of the movable core block, and the front and rear fixing plates are correspondingly embedded in the front and rear ends of the movable core block; and the front and rear fixing plates are also fitted on the front and rear end surfaces of the centrifugal block and positioned together by bolt pins.

[0017] The invention is ingenious in conception, reasonable in design, and has the characteristics of speed limit protection; in particular, the centrifugal block cooperates with the spring, and the friction force increases as the descending speed increases, which not only plays the role of descending speed limit protection, but also reduces the resistance at low speed and reduces the friction loss of the equipment; in addition, the one-way bearing is used in conjunction with the one-way mechanism, and the one-way bearing has the characteristics of good synchronization and rapid and direct response. If the one-way bearing is damaged or fails, the one-way mechanism is responsible, and seamless switching is achieved, which plays a double insurance role. In addition, the automatic recovery rope drum uses high-wear-resistant and high-strength webbing to comprehensively improve the safety of the equipment. Description of the drawings:

[0018] The present invention will be further described below in conjunction with specific illustrations:

[0019] Figure 1 Schematic diagram of the fall protector

[0020] Figure 2 Schematic diagram of the fall protection device

[0021] Figure 3 This is a cross-sectional diagram of the speed limiting device of the drop protector.

[0022] Figure 4 Schematic diagram of the decomposition of the speed limiter of the descending protector

[0023] Figure 5 Schematic diagram of the centrifugal block of the speed limiting device

[0024] Figure 6 Schematic diagram of the relationship between the active core block and the access shaft

[0025] in

[0026] 1—Access shaft 11—Keyway 12—Sliding key 121—Chamfer

[0027] 13—Gear 2—One-way bearing 21—Bearing 3—Active core block

[0028] 31- radial pin 32- one-way tooth 4- centrifugal block 41- front fixed plate

[0029] 42—rear fixing plate 43—long slot hole 5—friction block 6—housing

[0030] 61—end cover 62—friction ring 7—spring 8—bolt pin

[0031] 9—Automatic recovery rope drum 91—Big gear Specific implementation method:

[0032] Reference Figures 1 to 6 The speed limiting device of the descent protector comprises an access shaft 1 with a gear, a one-way bearing 2, a movable core block 3, a centrifugal block 4, a friction block 5 and a shell 6; the shell 6 has a cylindrical structure, and an end cover 61 is arranged at the front end. The access shaft 1 is supported and positioned with the shell 6 and the end cover 61 through two bearings 21 respectively, and the end of the access shaft 1 extending out of the shell is locked with a gear 13, which is meshed with the large gear 91 in the automatic recovery rope drum 9 by means of the gear 13, so that the rope pulling speed due to descent is converted into high-speed rotation of the access shaft 1.

[0033] like Figures 3 to 6 The movable core block 3 is positioned on the access shaft 1 through the one-way bearing 2, and the movable core block 3 is driven to rotate in one direction by the access shaft 1. When the automatic rope recovery drum 9 recovers the rope, the one-way bearing 2 slips, and the rope collection action can be completed without resistance; the centrifugal block 4 is positioned on the movable core block 3, and the friction block 5 is locked on the outer edge of the centrifugal block 4. The movable core block 3 rotates at a high speed, and the centrifugal block 4 opens outward under the action of centrifugal force, so that the friction block 5 contacts the inner surface of the shell 6 to form a friction speed limit.

[0034] More than two centrifugal masses 4 are positioned on the movable core block 3 through the front and rear fixing plates 41 and 42, can rotate with the movable core block 3, and can make radial movement relative to the movable core block 3, and are maintained in a radial contraction trend by the spring 7, that is, when the low-speed centrifugal force is reduced, the friction force is also reduced.

[0035] In this example, there are two centrifugal blocks 4, which are symmetrically distributed on the outside of the movable core block 3. Slots or long slots 43 parallel to each other are opened at both ends of the centrifugal blocks 3. The centrifugal blocks 4 are positioned on the movable core block 3 by means of the front and rear fixing plates 41, 42 and the bolt pin 8. The centrifugal blocks 4 are driven by the movable core block 3 to rotate, and can be radially opened under the action of centrifugal force; the spring 7 driving the contraction action is a tension spring, which is arranged between the two ends of the two centrifugal blocks 4 to form a pulling tendency to overcome the centrifugal force. The symmetrical design of the two centrifugal blocks 4 not only keeps the four long slots 43 parallel, but also the springs 8 at both ends are parallel to each other. It is not only easy to process and assemble, but also can be radially opened or retracted under the action of centrifugal force or spring force, and can be automatically adjusted according to the speed of descent to meet the speed limit of the maximum descent speed, and achieve automatic safety protection. In addition, the long slot 43 can also be a conventional slot larger than the bolt pin 8, so that the centrifugal block 4 has the freedom to open and retract, and is kept in the center by the spring 7, etc. Figure 5 The figure in the figure is actually a schematic diagram of the slot.

[0036] Considering that only two friction blocks 5 are used to form friction resistance in this example, and the molding material of the shell 6 affects factors such as friction, a specially designed friction ring 62 is embedded in the shell 6. With the help of the friction ring 62 in contact with the friction block 5, the shell 6 can be processed more flexibly.

[0037] In addition, the front and rear fixing plates 41, 42 are processed with corresponding and matching non-circular matching parts on the front and rear ends of the movable core block 3. The front and rear fixing plates 41, 42 are correspondingly embedded in the front and rear ends of the movable core block 3, and can be additionally locked by screws, which can greatly reduce the tangential force of the screws; and the front and rear fixing plates 41, 42 are also fitted on the front and rear end surfaces of the centrifugal block 4 and are positioned together by bolt pins 8.

[0038] In another example, there are more than three centrifugal blocks 4, preferably three or four, and they are rotationally symmetrically distributed on the outside of the movable core block. A radial long slot 43 is set on each centrifugal block 4, which is positioned on the movable core block 3 with the help of front and rear fixing plates 41, 42 and bolt pins 8. The centrifugal block 4 is driven by the movable core block 3 to rotate, and can produce radial expansion under the action of centrifugal force; the spring 7 that drives the contraction action is also a tension spring, and the tension spring is provided with the following preferred structure: 1. The two ends of the tension spring are respectively suspended between the end faces of adjacent centrifugal blocks 4, that is, they are wound around each other to form a circle. The combined force of the spring 7 can synchronously pull multiple centrifugal blocks 4 to the center of the circle to form a retraction action; 2. The two ends of the tension spring are respectively suspended between the centrifugal block 4 and the movable core block 3, and two can be used to form a balanced action, or one can be used with a central design.

[0039] The above-mentioned long slot hole 43 cooperates with the bolt pin 8. If it is a double-slot design, the centrifugal block 4 can only open or retract in the direction parallel to the long slot hole 43. However, if it adopts a single long slot hole design, the cross-section of the matching bolt pin 8 adopts a rectangular structure, which can also constrain the movement direction of the centrifugal block 4.

[0040] In order to maintain a centrifugal movement space for opening and retracting between the centrifugal block 4 and the movable core block 3, the centrifugal block 4 adopts a ring-shaped design and is positioned on the outer circumference of the movable core block 3. For this purpose, a radial pin 31 is also provided on the circumference of the movable core block 3. The end of the radial pin 31 can abut against the inner arc surface of the centrifugal block 4 to form a retraction limit effect, and together with the tension of the spring, a pulling and pushing state is formed to eliminate the vibration gap and reduce unnecessary noise.

[0041] Due to its structural reasons, the load of the one-way bearing 2 cannot be too large. Even if a double one-way bearing 2 design is adopted, there is a risk of damage and slippage. For this reason, the present application preferably uses the following two combinations:

[0042] 1. The movable core block 3 is also provided with a one-way tooth 32 on the circumference of one side of the sleeve of the one-way bearing; a keyway 11 is radially penetrated on the access shaft 1 covered by the one-way tooth 32, and a sliding key 12 is provided in the keyway, and the sliding key 12 can be hung on the one-way tooth 32 in the stuck direction of the one-way bearing 2. The cooperation between the sliding key 12 and the one-way tooth 32 requires that the movable core block 3 and the access shaft 1 have an offset rotation stroke, while the one-way bearing 2 does not need this stroke, so the one-way bearing 2 is in effect in the normal state, and only when the one-way bearing fails, the sliding key will work, forming a double insurance effect. Furthermore, the sliding key 12 is a rectangular body structure, and the rear corner corresponding to the stuck direction is rounded 121, which can be smoothly driven by the inclined surface of the one-way tooth 32 without affecting the rope collection action.

[0043] Second, the movable core block 3 is also provided with a one-way groove on the circumference of one side of the sleeve one-way bearing 2, and a roller is provided between the access shaft 1 covered by the one-way groove. The roller can enter the one-way groove in the direction of the one-way bearing 2 being stuck and stuck between the access shaft 1 and the movable core block 3, that is, the roller is brought into the one-way groove inclined surface and the narrow end of the access shaft. The principle is similar to the previous one, and the legend is omitted.

Claims

1. A speed limiting device for a drop protector, comprising an access shaft with a gear, a one-way bearing, a movable core block, a centrifugal block, a friction block and a shell; the movable core block is positioned on the access shaft through the one-way bearing, and the access shaft drives the movable core block to rotate in one direction; the centrifugal block is positioned on the movable core block, and the friction block is locked on the outer edge of the centrifugal block and can resist the inner surface of the shell to form friction; it is characterized in that: More than two centrifugal blocks are positioned on the movable core block through front and rear fixing plates, and can make radial movement relative to the movable core block, and the radial contraction trend is maintained by a spring; a radial pin is also arranged on the circumference of the movable core block, and the end of the radial pin can abut against the inner arc surface of the centrifugal block; any of the following mechanisms is also arranged between the movable core block and the access shaft:

1. The movable core block is also provided with a one-way tooth on the circumference of one side of the sleeve one-way bearing; a keyway is radially penetrated on the access shaft covered by the one-way tooth, and a sliding key is arranged in the keyway, and the sliding key can be hung on the one-way tooth in the stuck direction of the one-way bearing; 2. The movable core block is also provided with a one-way groove on the circumference of one side of the sleeve one-way bearing, and a roller is arranged between the access shaft covered by the one-way groove, and the roller can enter the one-way groove in the stuck direction of the one-way bearing and be stuck between the access shaft and the movable core block.

2. A speed limiting device for a drop protector according to claim 1, characterized in that: There are two centrifugal blocks, which are symmetrically distributed on the outside of the movable core block. Slots or long slots parallel to each other are opened at both ends of the centrifugal blocks. They are positioned on the movable core block with the help of front and rear fixing plates and bolt pins. The centrifugal blocks are driven to rotate by the movable core block, and can be radially opened under the action of centrifugal force; the spring driving the contraction action is a tension spring, which is arranged between the two ends of the two centrifugal blocks to form a pulling trend to overcome the centrifugal force.

3. A speed limiting device for a drop protector according to claim 1, characterized in that: There are more than three centrifugal blocks, which are rotationally symmetrically distributed on the outside of the movable core block. Each centrifugal block is provided with a radial long slot hole, which is positioned on the movable core block with the help of front and rear fixing plates and bolt pins. The centrifugal block is driven to rotate by the movable core block, and can produce radial expansion under the action of centrifugal force; the spring driving the contraction action is a tension spring, and the tension spring is set to one of the following structures:

1. The two ends of the tension spring are respectively suspended between the end faces of adjacent centrifugal blocks; 2. The two ends of the tension spring are respectively suspended between the centrifugal block and the movable core block.

4. A speed limiting device for a drop protector according to claim 1, characterized in that: The sliding key is a rectangular structure, and the rear corners corresponding to the locking direction are rounded.

5. A speed limiting device for a drop protector according to claim 1, characterized in that: A friction ring is embedded in the housing, and contacts the friction block via the friction ring.

6. A speed limiting device for a drop protector according to claim 1, 2 or 3, characterized in that: The front and rear fixing plates are processed with corresponding and matching non-circular matching parts on the front and rear ends of the movable core block, and the front and rear fixing plates are correspondingly embedded in the front and rear ends of the movable core block; and the front and rear fixing plates are also fitted on the front and rear end surfaces of the centrifugal block and positioned together by bolt pins.

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