CN217102583U

CN217102583U - Manual uniform-speed descending speed limiting mechanism for construction elevator

Info

Publication number: CN217102583U
Application number: CN202123069829.1U
Authority: CN
Inventors: 应晔; 王健健; 华捷; 肖栋; 沈健
Original assignee: SCIENCE AND TECHNOLOGY DEVELOPMENT Co OF SRIBS
Current assignee: SCIENCE AND TECHNOLOGY DEVELOPMENT Co OF SRIBS
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-08-02
Anticipated expiration: 2031-12-08

Abstract

A manual uniform-speed descending speed limiting mechanism for a construction elevator relates to the technical field of elevator speed limiting protection devices, and is correspondingly provided with a manual trigger mechanism, wherein the uniform-speed descending speed limiting mechanism is not triggered in a non-speed limiting state, and the action speed of the uniform-speed descending speed limiting mechanism is smaller than the running speed of the construction elevator so that the construction elevator runs normally; under the speed limit state, trigger through manual trigger mechanism and descend speed-limiting mechanism at the uniform velocity, when descending speed-limiting mechanism's at the uniform velocity rotational speed reached and predetermine protection speed, descend speed-limiting mechanism at the uniform velocity under the effect of centrifugal force and produce the speed-limiting resistance to the construction elevator in order to realize descending at the uniform velocity of construction elevator, the utility model discloses in, can descend at the uniform velocity when the elevator breaks down, need not the frequent switching motor braking machine of passenger, both can avoid the condition emergence that probably influences passenger's safety such as the sudden quick decline of elevator, sudden stop motion.

Description

Manual uniform-speed descending speed limiting mechanism for construction elevator

Technical Field

The utility model relates to a lift speed limit protection device technical field, concretely relates to manual at the uniform velocity decline speed-limiting mechanism for construction elevator.

Background

The construction elevator is a key device in the construction process of a building, and when the construction elevator breaks down and stops in the air and cannot run, passengers in the cage can lower the cage by opening a brake of the construction elevator. However, when the construction hoist brake is released, the hoist is in a free-fall state, and the lowering speed thereof gradually increases under the influence of gravity. Therefore, passengers in the elevator need to frequently switch on and off the motor brake to prevent the elevator from descending too fast. However, the operation mode has high risk, and the accelerated wear failure of the brake is easily caused, so that accidents occur. Therefore, a set of speed limiting mechanism is needed to control the descending speed within a certain range when a person operates the elevator to manually descend after the elevator breaks down.

Along with the development of construction mode and product pluralism technique, construction elevator design and manufacturing technology development are rapid, based on the uncontrollable condition of present construction elevator deceleration when manual decline, the utility model provides a simple structure, lift at the uniform velocity decline speed limit mechanism of dependable performance.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a manual at the uniform velocity decline speed-limiting mechanism for construction elevator, concrete scheme as follows:

a manual uniform-speed descending speed limiting mechanism for a construction elevator is characterized in that a motor brake is arranged in the elevator and comprises a motor and a speed reducer, the uniform-speed descending speed limiting mechanism is arranged between the motor and the speed reducer and is correspondingly provided with a manual trigger mechanism,

in a non-speed-limiting state, the uniform-speed descending speed-limiting mechanism is not triggered, and the action speed of the uniform-speed descending speed-limiting mechanism is smaller than the running speed of the construction elevator so that the construction elevator runs normally;

and in a speed limiting state, triggering the uniform descending speed limiting mechanism through the manual trigger mechanism, wherein when the rotating speed of the uniform descending speed limiting mechanism reaches a preset protection speed, the uniform descending speed limiting mechanism generates speed limiting resistance to the construction lifter under the action of centrifugal force so as to realize uniform descending of the construction lifter.

Furthermore, the uniform-speed descending speed limiting mechanism comprises a speed limiter shell, and a centrifugal block and a limiting ring which are arranged in the speed limiter shell, wherein the centrifugal block can do outward centrifugal motion relative to the speed limiter shell;

under the non-speed-limiting state, the limit ring is meshed with the centrifugal block to be clamped tightly;

under the speed limiting state, the manual trigger mechanism drives the limiting ring to be far away from the centrifugal block, and the centrifugal block and the speed limiter shell are attached to each other to realize mutual friction.

Furthermore, the uniform-speed descending speed limiting mechanism further comprises a centrifugal seat, a quincunx coupler, a connecting shaft, a fixing screw, a jacking spring and a shaft end baffle, wherein the centrifugal seat, the quincunx coupler, the connecting shaft, the fixing screw, the jacking spring and the shaft end baffle are arranged in the speed limiter shell;

the limiting ring is coaxially connected with one side of the centrifugal seat, which is away from the shaft end baffle, through the fixing screw rod, the jacking spring is elastically sleeved between the limiting ring and the fixing screw rod, and the centrifugal block is positioned in a space formed by the limiting ring, the centrifugal seat and the shaft end baffle.

Furthermore, the uniform descending speed limiting mechanism further comprises a connecting/speed regulating structure, two centrifugal blocks are symmetrically arranged by taking the connecting shaft as a center, and the two centrifugal blocks are elastically connected through the connecting/speed regulating structure.

Furthermore, the connection/speed regulation structure comprises an extension spring, spring connection bolts and limit nuts, wherein the two ends of the extension spring are connected with the spring connection bolts, the two spring connection bolts are respectively locked on the two centrifugal blocks through the limit nuts, and the extension spring is arranged along the circumferential direction of the connection shaft in the length direction.

Further, the speed limiting value can be adjusted by changing the mass of the centrifugal block and the tension of the extension spring through the connecting/speed adjusting structure.

Further, manual trigger mechanism includes hand brake, pulling transfer line, rotation driving lever, linkage round bar, driving piece, eccentric thumb wheel A and eccentric thumb wheel B, the hand brake with the pulling transfer line transmission is connected, eccentric thumb wheel A and eccentric thumb wheel B all install in just all can promote on the overspeed governor casing the spacing collar is kept away from relatively the centrifugation piece, the linkage round bar can be relative the reciprocating rotary motion is done to the overspeed governor casing, the both ends of linkage round bar are connected with respectively rotates driving lever and pulling transfer line, it all is connected with to rotate driving lever, pulling transfer line the driving piece, the driving piece respectively with eccentric thumb wheel A and eccentric thumb wheel B are connected.

Furthermore, the manual trigger mechanism further comprises a transmission steel wire rope and a steel wire rope guide wheel which are arranged between the hand brake and the pulling transmission rod, the transmission steel wire rope is wound on the steel wire rope guide wheel, and one end of the transmission steel wire rope is connected with the pulling transmission rod.

Furthermore, a motor switch connecting rod is arranged on the linkage round rod in a linkage mode and used for controlling the working state of the motor.

Compared with the prior art, the beneficial effects of the utility model are as follows:

(1) the mechanism adopts a purely mechanical centrifugal principle, and by arranging the manual trigger mechanism, a passenger in the elevator can operate the working state of the constant-speed descending speed limiting mechanism through the manual trigger mechanism, so that the operation is convenient. When the elevator normally runs, the constant-speed descending speed limiting mechanism cannot be triggered, so that the normal work of the elevator cannot be influenced. When the elevator breaks down and stops in the air and cannot run, a passenger in the elevator operates the manual trigger mechanism to open the motor brake and activate the uniform-speed descending speed limiting mechanism, when the rotating speed of the uniform-speed descending speed limiting mechanism reaches a preset protection speed, speed limiting resistance to the construction elevator is generated under the action of centrifugal force, so that the uniform-speed descending of the construction elevator can be realized, the safety and the stability of the passenger are ensured, the passenger does not need to frequently open and close the motor brake, the situations that the safety of the passenger is possibly influenced by sudden rapid descending, sudden stop motion and the like of the elevator can be avoided, the motor brake can be prevented from being always abraded, and the risk of accidents caused by failure of the motor brake can be reduced.

The utility model discloses not only can be applicable to the lift, still can be used to the occasion that needs carry out the speed limit to the work piece who makes sharp or rotary motion such as lift work platform.

(2) The utility model provides a speed-limiting mechanism descends at the uniform velocity is mechanical structure and constitutes, high reliability, the detailing, after taking personnel to trigger through manual trigger mechanism and descend speed-limiting mechanism at the uniform velocity after, manual trigger mechanism drives the spacing collar and keeps away from the centrifugal piece, the spacing collar no longer meshes with the centrifugal piece, after the limiting displacement of spacing collar is lost to the centrifugal piece, the centrifugal piece is on the basis of overcoming extension spring's pretightning force, the relative overspeed governor casing of centrifugal force that receives the rotation production is outside centrifugal motion, outwards throw away, and produce the moment of torsion balanced with lift gravity phase with the friction of overspeed governor casing, along with descending the inside rotational speed increase of speed-limiting mechanism at the uniform velocity, the corresponding increase of frictional resistance, until reaching dynamic balance, realize that the construction elevator descends at the uniform velocity.

(3) The speed limit value can be adjusted by changing the mass of the centrifugal block and the tension of the extension spring, so that the uniform-speed descending speed limit mechanism can be simultaneously used for the conditions of high speed and low speed of the lifter.

Drawings

Fig. 1 is a schematic view of the whole of the constant speed descending speed limiting mechanism, the motor and the speed reducer of the present invention;

FIG. 2 is a transverse sectional view of the uniform descending speed limiting mechanism of the present invention;

FIG. 3 is a longitudinal sectional view of the uniform descending speed limiting mechanism of the present invention;

fig. 4 is a schematic structural view of a middle uniform descending speed limiting mechanism display connection/speed regulation structure of the utility model;

fig. 5 is a schematic structural view of the eccentric thumb wheel a of the present invention;

fig. 6 is a schematic sectional view of the eccentric thumb wheel a of the present invention.

Reference numerals: 1. rotating the deflector rod; 2. a linkage round bar; 3. a driving strap; 4. an eccentric thumb wheel A; 41. jacking a bearing; 42. an eccentric shaft; 43. an eccentric wheel seat; 44. a drive plate; 5. a motor switch connecting rod; 6. a tension transmission rod; 7. an eccentric thumb wheel B; 8. a transmission wire rope; 9. a wire rope guide wheel; 10. a jacking spring; 11. a limiting ring; 12. a friction plate; 13. a centrifugal block; 14. a centrifugal seat; 15. a shaft end baffle; 16. a connecting shaft; 17. a governor housing; 18. a quincunx coupling; 19. fixing the screw rod; 20. a spring connecting bolt; 21. an extension spring; 22. a limit nut; 23. a motor; 24. and a speed reducer.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1, along with the development of construction method and product diversification technique, construction elevator design and manufacturing technical development are rapid, based on the uncontrollable condition of the deceleration of present construction elevator when manual decline, the utility model provides a simple structure, the lift with reliable performance is with manual at the uniform velocity decline speed limit mechanism, when taking personnel in the lift breaks down at the lift, the elevator is kept descending at the uniform velocity in this mechanism of accessible control, and its at the uniform velocity decline speed can be adjusted.

The elevator is provided with a motor 23 brake, and the opening and closing state of the motor 23 brake is controlled to adjust the descending speed of the elevator in the descending process of the elevator. The brake of the motor 23 comprises a motor 23 and a speed reducer 24, the uniform descending speed limiting mechanism is arranged between the motor 23 and the speed reducer 24, the uniform descending speed limiting mechanism is correspondingly provided with a manual trigger mechanism, the uniform descending speed limiting mechanism is not triggered in a non-speed-limiting state, and the action speed of the uniform descending speed limiting mechanism is smaller than the running speed of the construction elevator so as to ensure that the construction elevator runs normally. In a speed limiting state, the constant-speed descending speed limiting mechanism is triggered through the manual trigger mechanism, and when the rotating speed of the constant-speed descending speed limiting mechanism reaches a preset protection speed, the constant-speed descending speed limiting mechanism generates speed limiting resistance to the construction lifter under the action of centrifugal force so as to realize the constant-speed descending of the construction lifter.

In addition, when the passenger triggers the uniform descending speed limiting mechanism through the manual trigger mechanism, the motor 23 brake is triggered, the uniform descending speed limiting mechanism and the motor 23 brake act together to generate a braking effect on the elevator, and the elevator is controlled to do uniform descending motion.

Referring to fig. 2 and 3, in detail, the constant-speed descending speed limiting mechanism includes a speed governor housing 17, and a centrifugal block 13, a limiting ring 11, a centrifugal seat 14, a quincunx coupling 18, a connecting shaft 16, a fixing screw 19, a jacking spring 10, and a shaft end baffle 15, which are disposed inside the speed governor housing 17. The connecting shaft 16 is used for being matched and connected with the motor 23 and the speed reducer 24, the outer part of the connecting shaft 16 is coaxially sleeved with the quincunx coupling 18, the centrifugal seat 14 is coaxially fixed on the quincunx coupling 18 through key connection, the shaft end baffle 15 is coaxially embedded on the quincunx coupling 18 and is in limit butt joint with one side of the centrifugal seat 14, as shown in the figure, under the common blocking effect of the quincunx coupling 18 and the shaft end baffle 15, the centrifugal seat 14 cannot move rightwards relative to the centrifugal seat 14, and the position is fixed. The core structure of the uniform descending speed limiting mechanism which substantially has the speed limiting function is a centrifugal block 13 and a limiting ring 11, the limiting ring 11 is a closed annular structure, the limiting ring 11 is coaxially connected with one side of the centrifugal seat 14, which is far away from the shaft end baffle 15, through two fixing screws 19 which are arranged up and down, the fixing screws 19 can further extend into the shaft end baffle 15, particularly, the limiting ring 11 is a movable structure, and the limiting ring 11 can do reciprocating motion relative to one end, far away from the shaft end baffle 15, of the fixing screws 19. The centrifugal blocks 13 are located in a space formed by the limiting ring 11, the centrifugal seat 14 and the shaft end baffle 15, and two centrifugal blocks 13 are symmetrically arranged by taking the connecting shaft 16 as a center. A jacking spring 10 is elastically sleeved between the limiting ring 11 and the fixing screw 19, and the elastic force generated by the jacking spring 10 can press the limiting ring 11 to be in contact with the centrifugal block 13.

According to the connection and position relationship between the centrifugal block 13 and the stop collar 11, at this time, the centrifugal block 13 is also movable, when the motor 23 rotates, the centrifugal block 13 can make an outward centrifugal motion relative to the speed limiter housing 17 under the driving of the connecting shaft 16 when rotating, and if the centrifugal block 13 is always in a centrifugal motion, the normal operation of the elevator in a non-speed-limiting state can be damaged, so that, in the non-speed-limiting state, the stop collar 11 and the centrifugal block 13 are engaged and clamped tightly, specifically, a protrusion on the side surface of the stop collar 11 is embedded in a groove on the centrifugal block 13, and the centrifugal block 13 radially positions the centrifugal block 13 under the limiting action of the stop collar 11, that is, the outward centrifugal motion cannot be made at any time. And the limiting ring 11 can not move leftwards along the fixed screw rod 19 under the limiting action of the manual trigger mechanism, so that the limiting ring 11 is tightly meshed with the centrifugal block 13, and the radial positioning of the limiting ring 11 on the centrifugal block 13 is further improved.

When the elevator breaks down and stops in the air and cannot run, the uniform-speed descending speed limiting mechanism is triggered to enable the elevator to be in a speed limiting state, in the speed limiting state, the manual trigger mechanism drives the limiting ring 11 to be far away from the centrifugal block 13, the limiting ring 11 is not meshed with the centrifugal block 13, after the centrifugal block 13 loses the limiting function of the limiting ring 11, the centrifugal block 13 does outward centrifugal motion relative to the speed limiter shell 17 under the centrifugal force generated by rotation on the basis of overcoming the pre-tightening force of the tension spring 21, the centrifugal force is thrown outward, the centrifugal block and the speed limiter shell 17 rub to generate torque balanced with the gravity of the elevator, the internal rotating speed of the speed limiting mechanism is increased along with uniform-speed descending, the friction resistance is correspondingly increased until dynamic balance is achieved, and the uniform descending of the construction elevator is achieved.

Optimally, the friction plate 12 can be arranged on the outer surface of the centrifugal block 13, and the friction plate 12 can be replaced, so that the friction force between the centrifugal block and the speed limiter shell 17 can be increased, the direct damage to the centrifugal block 13 can be reduced, and the service life of the centrifugal block 13 is ensured.

As shown in fig. 4, in order to ensure that the two centrifugal blocks 13 can generate centrifugal motion simultaneously and stably and adjust the speed-limiting effect of the uniform descending speed-limiting mechanism on the elevator, the uniform descending speed-limiting mechanism further includes a connection/speed-regulating structure, because the centrifugal blocks 13 are similar to be semi-cylindrical, the connection/speed-regulating structure is disposed between the two ends of the centrifugal blocks 13 close to each other, and the two centrifugal blocks 13 are elastically connected through the connection/speed-regulating structure. Specifically, the connecting/speed regulating structure includes an extension spring 21, a spring connecting bolt 20, and a limit nut 22, both ends of the extension spring 21 are connected with the spring connecting bolt 20, the two spring connecting bolts 20 are respectively locked on the two centrifugal blocks 13 by the limit nut 22, and the length direction of the extension spring 21 is arranged along the circumferential direction of the connecting shaft 16.

Under the action of the tensile force of the extension spring 21, the two centrifugal blocks 13 can be hooped on the surface of the centrifugal seat 14, and according to the difference of the magnitude of the tensile force, the centrifugal blocks 13 have different degrees of outward centrifugal movement, the greater the tensile force is, the closer the centrifugal blocks 13 contract relative to the centrifugal seat 14, the greater the difficulty of the outward centrifugal movement is, and conversely, the smaller the tensile force is, the less the difficulty of the outward centrifugal movement is.

The connecting/speed regulating structure can adjust the difficulty of the centrifugal block 13 in outward centrifugal motion by changing the mass of the centrifugal block 13 and the tension of the tension spring 21, and further can adjust the speed limiting effect on the elevator, and the speed limiting value of the uniform-speed descending speed limiting mechanism can be adjusted according to the numerical value of the formula relation among the tension of the tension spring 21, the mass, the centrifugal force and the rotating speed of the centrifugal block 13 and the rotating speed of the elevator.

As shown in fig. 1, in order to realize that the passenger can manually operate the speed limit and realize the lifting action of the spacing collar 11, the manual trigger mechanism plays a role of transmitting the external manual pulling force to the inside of the constant-speed descending speed limit mechanism, the manual trigger mechanism comprises a hand brake, a pulling transmission rod, a rotating shifting rod 1, a linkage round rod 2, a transmission piece 3, an eccentric shifting wheel a4 and an eccentric shifting wheel B7, the hand brake is in transmission connection with the pulling transmission rod, the eccentric shifting wheel a4 and the eccentric shifting wheel B7 are both mounted on the speed limiter housing 17, the eccentric shifting wheel a4 and the eccentric shifting wheel B7 can push the spacing collar 11 to be relatively far away from the centrifugal block 13 due to the eccentric arrangement when performing the self-rotation movement, the eccentric shifting wheel a4 and the eccentric shifting wheel B7 are similar structures, for example, the eccentric shifting wheel a4 comprises a lifting bearing 41, an eccentric shaft 42, an eccentric wheel seat 43 and a transmission plate 44 in combination with fig. 5 and 6, the two ends of the eccentric shaft 42 are respectively connected with a jacking bearing 41 and a transmission plate 44, the eccentric shaft 42 is rotatably arranged in an eccentric wheel seat 43 in a penetrating way, the jacking bearing 41 can do eccentric rotation movement with the center of the eccentric shaft 42 when the eccentric shaft 42 rotates, and when the transmission plate 44 is pressed by external force, the jacking bearing 41 can move, and then the limit ring 11 is pushed by the jacking bearing 41. The eccentric thumb wheel B7 will not be described in detail herein.

The linkage round rod 2 is installed on the outer wall of the speed governor shell 17 through a rotating frame and can do reciprocating rotation motion relative to the speed governor shell 17, two ends of the linkage round rod 2 are respectively connected with a rotation shifting rod 1 and a pulling transmission rod, the rotation shifting rod 1 and the pulling transmission rod are both connected with a transmission piece 3, and the transmission piece 3 is respectively connected with an eccentric shifting wheel A4 and an eccentric shifting wheel B7.

In order to realize the transmission connection between the hand brake and the pulling transmission rod, the manual trigger mechanism further comprises a transmission steel wire rope 8 and a steel wire rope guide wheel 9 which are arranged between the hand brake and the pulling transmission rod, the steel wire rope 8 is wound on the steel wire rope guide wheel 9 to play a guiding role, and one end of the transmission steel wire rope 8 is connected with the pulling transmission rod. In addition, in order to realize that the passenger triggers the uniform-speed descending speed limiting mechanism through the manual trigger mechanism and simultaneously triggers the brake of the motor 23, the linkage round rod 2 is provided with a switch connecting rod 5 of the motor 23 in a linkage manner, and the switch connecting rod 5 of the motor 23 is used for controlling the working state of the motor 23.

When the speed limiting function needs to be triggered, a passenger transmits pulling force to the pulling force transmission rod 6 through the steel wire rope through the hand brake, and then the pulling force is transmitted to the transmission piece 3 and the rotating shifting rod 1 at two ends through the rotation of the linkage round rod 2, so that the eccentric shifting wheel A4 and the eccentric shifting wheel B7 are driven to do eccentric rotation motion. Meanwhile, the linkage round rod 2 pulls the switch connecting rod 5 of the motor 23 to open the brake switch of the motor 23, the two eccentric shifting wheels A4 and the eccentric shifting wheel B7 which are symmetrically arranged simultaneously rotate to push the limiting ring 11 in the diagram 2 to move towards the left side in the diagram along the fixed screw rod 19 until leaving the limiting position, so that the centrifugal block 13 is not meshed with the limiting ring 11 for clamping, and the centrifugal block 13 is further rubbed with the speed limiter shell 17 under the action of centrifugal force to generate speed limiting resistance on the construction lifter.

When the speed-limiting state needs to be cancelled, the hand brake is closed, in the operation aspect, the eccentric shifting wheel A4 and the eccentric shifting wheel B7 reset, the limiting ring 11 resets under the pushing of the jacking spring 10 and is meshed with the centrifugal block 13 again for clamping, the centrifugal block 13 cannot continue to do outward centrifugal motion, the speed-limiting resistance to the construction elevator cannot be generated, and the normal work of the elevator is ensured.

Is the utility model discloses a preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the fan belongs to the utility model discloses technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A manual uniform-speed descending speed limiting mechanism for a construction elevator is characterized in that a motor (23) brake is arranged in the elevator, the motor (23) brake comprises a motor (23) and a speed reducer (24), the manual uniform-speed descending speed limiting mechanism is arranged between the motor (23) and the speed reducer (24), and a manual trigger mechanism is correspondingly arranged on the uniform-speed descending speed limiting mechanism;

2. The manual uniform-speed descending speed limiting mechanism for the construction elevator as claimed in claim 1, wherein the uniform-speed descending speed limiting mechanism comprises a speed governor housing (17), and a centrifugal block (13) and a limiting ring (11) which are arranged inside the speed governor housing (17), wherein the centrifugal block (13) can do outward centrifugal motion relative to the speed governor housing (17);

under the non-speed-limiting state, the limiting ring (11) is meshed with the centrifugal block (13) to be clamped tightly;

under the speed limiting state, the manual trigger mechanism drives the limiting ring (11) to be far away from the centrifugal block (13), and the centrifugal block (13) and the speed limiter shell (17) are attached to each other to realize mutual friction.

3. The manual uniform-speed descending speed limiting mechanism for the construction elevator as claimed in claim 2, further comprising a centrifugal seat (14), a quincunx coupler (18), a connecting shaft (16), a fixing screw (19), a jacking spring (10) and a shaft end baffle (15) which are arranged inside the speed limiter housing (17), wherein the quincunx coupler (18) is coaxially sleeved outside the connecting shaft (16), the centrifugal seat (14) is coaxially fixed on the quincunx coupler (18) through key connection, and the shaft end baffle (15) is coaxially embedded on the quincunx coupler (18) and is in limit abutting connection with one side of the centrifugal seat (14);

spacing collar (11) pass through clamping screw (19) with centrifugal seat (14) deviate from one side coaxial coupling of axle head baffle (15), just spacing collar (11) with elastic sleeve is equipped with between clamping screw (19) jacking spring (10), centrifugal piece (13) are in the space that spacing collar (11), centrifugal seat (14) and axle head baffle (15) formed.

4. The manual uniform descending speed limiting mechanism for the construction elevator as claimed in claim 3, wherein the uniform descending speed limiting mechanism further comprises a connecting/speed regulating structure, two centrifugal blocks (13) are symmetrically arranged with the connecting shaft (16) as a center, and the two centrifugal blocks (13) are elastically connected through the connecting/speed regulating structure.

5. The manual uniform-speed descending speed limiting mechanism for the construction elevator as claimed in claim 4, wherein the connecting/speed regulating structure comprises an extension spring (21), spring connecting bolts (20) and a limiting nut (22), the two ends of the extension spring (21) are connected with the spring connecting bolts (20), the two spring connecting bolts (20) are respectively locked on the two centrifugal blocks (13) through the limiting nut (22), and the extension spring (21) is arranged along the circumferential direction of the connecting shaft (16).

6. The manual uniform speed descending speed limiting mechanism for the construction elevator according to claim 5, wherein the connecting/speed regulating structure can adjust the speed limit value by changing the mass of the centrifugal block (13) and the tension of the extension spring (21).

7. The manual constant-speed descending speed limiting mechanism for the construction elevator as claimed in claim 2, wherein the manual trigger mechanism comprises a hand brake, a pulling transmission rod, a rotating shift lever (1), a linkage round rod (2), a transmission piece (3), an eccentric shift wheel A (4) and an eccentric shift wheel B (7), the hand brake is in transmission connection with the pulling transmission rod, the eccentric shift wheel A (4) and the eccentric shift wheel B (7) are both mounted on the governor housing (17) and can push the limiting ring (11) to be relatively far away from the centrifugal block (13), the linkage round rod (2) can make reciprocating rotation movement relative to the governor housing (17), the two ends of the linkage round rod (2) are respectively connected with the rotating shift lever (1) and the pulling transmission rod, the rotating shift lever (1) and the pulling transmission rod are both connected with the transmission piece (3), the transmission piece (3) is respectively connected with the eccentric thumb wheel A (4) and the eccentric thumb wheel B (7).

8. The manual uniform-speed descending speed limiting mechanism for the construction elevator as claimed in claim 7, wherein the manual trigger mechanism further comprises a transmission steel wire rope (8) and a steel wire rope guide wheel (9) arranged between the hand brake and the pulling transmission rod, the transmission steel wire rope (8) is wound on the steel wire rope guide wheel (9), and one end of the transmission steel wire rope (8) is connected with the pulling transmission rod.

9. The manual constant-speed descending speed limiting mechanism for the construction elevator as claimed in claim 8, wherein a motor (23) switch connecting rod (5) is arranged on the linkage round rod (2) in a linkage manner, and the motor (23) switch connecting rod (5) is used for controlling the working state of the motor (23).