CN211945862U

CN211945862U - Height-adjustable counterweight frame

Info

Publication number: CN211945862U
Application number: CN202020132904.0U
Authority: CN
Inventors: 李涛; 张文欣; 高金尧; 陈雨凡; 方宗利
Original assignee: ZHEJIANG XIZI HEAVY INDUSTRY MACHINERY CO LTD
Current assignee: Xin Xi'ao Elevator Group Co.,Ltd.
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-11-17
Anticipated expiration: 2030-01-20

Abstract

The application discloses counterweight housing with adjustable height, including double-phase straight beam, the back timber and the floorbar of connecting respectively between two straight beams of arranging relatively, each straight beam includes: an upper straight beam fixedly connected to the top beam; the lower straight beam is fixedly connected to the bottom beam and is in sliding fit with the upper straight beam; a guide mechanism acting between the upper straight beam and the lower straight beam; the locking pin device keeps the relative sliding position of the upper straight beam and the lower straight beam; and the limiting mechanism acts between the upper straight beam and the lower straight beam to limit the limit sliding positions of the upper straight beam and the lower straight beam. The application provides a height-adjustable counterweight housing can adjust counterweight housing's height.

Description

Height-adjustable counterweight frame

Technical Field

The application relates to the technical field of elevators, in particular to a height-adjustable counterweight housing.

Background

The height of a counterweight housing of an elevator in the current market is generally fixed and unchanged, but the height of a civil top floor of a hoistway on site often deviates from a design value, if the height of the counterweight housing is fixed and unchanged, the counterweight housing rushes to the top when the height of the top floor is small, so that a counterweight housing straight beam needs to be manufactured again, the installation period of the elevator is prolonged, and the increase of secondary manufacturing and installation cost is brought.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a height-adjustable counterweight housing for solving the technical problem of the counterweight housing having a top-rushing phenomenon caused by the constant height of the counterweight housing.

In order to achieve the purpose, the following technical scheme is adopted in the application: the utility model provides a height-adjustable counterweight housing, includes two straight beams of arranging relatively, connects top beam and floorbar between two straight beams respectively, and each straight beam includes:

an upper straight beam fixedly connected to the top beam;

the lower straight beam is fixedly connected to the bottom beam and is in sliding fit with the upper straight beam;

a guide mechanism acting between the upper straight beam and the lower straight beam;

the locking pin device keeps the relative sliding position of the upper straight beam and the lower straight beam;

and the limiting mechanism acts between the upper straight beam and the lower straight beam to limit the limit sliding positions of the upper straight beam and the lower straight beam.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the guide mechanism includes a guide slide rail and a guide slide block which are in sliding fit with each other;

one of the guide slide rail and the guide slide block is fixed on the lower straight beam, and the other is fixed on the upper straight beam.

Optionally, the limiting mechanism includes:

the first stop piece is fixed on one of the upper straight beam and the lower straight beam, and the guide slide rail is installed on the one of the upper straight beam and the lower straight beam;

the second stop piece is fixed on one of the upper straight beam and the lower straight beam, and the guide sliding block is installed on the other of the upper straight beam and the lower straight beam;

when the upper straight beam and the lower straight beam are relatively far away from each other and slide to the limit, the first stop piece is abutted against the guide sliding block;

when the upper straight beam and the lower straight beam are relatively close to each other and slide to the limit, the first stop piece abuts against the second stop piece.

Optionally, the first stop member and the second stop member are respectively one of the following structures:

the beam is in a block structure and is fixed on the straight beam;

and one side of the L-shaped corner is used as a fixing sheet connected to the straight beam, and the other side of the L-shaped corner is used as a stop sheet.

Optionally, the lower straight beam and the upper straight beam are respectively provided with a limiting hole matched with the lock pin device;

the latch device includes:

the bracket is attached to the lower straight beam or the upper straight beam;

the lock rod penetrates through the bracket and is matched with the limiting hole;

a spring acting between the locking bar and the bracket, the spring driving the locking bar into a locked position;

and the stop pin is fixed on the lock rod and is abutted against the support to keep the lock rod at the unlocking position.

Optionally, the bracket is provided with a sliding hole for the lock rod to pass through and an avoidance hole for the stop pin to pass through;

the dodging hole is located the periphery of lock position and communicate in the slide opening, the backstop round pin is adjusted and is allowed the locking lever to get into the lock position under the hole state of dodging well, and the backstop round pin is in the hole state of dodging down the restriction locking lever stretch into spacing hole with the locking lever keeps releasing the lock position.

Optionally, one end of the lock rod, which is far away from the limiting hole, is provided with a force application part to drive the lock rod to move.

Optionally, the avoiding holes are distributed in a radiation manner relative to the sliding holes so as to adapt to the situation that the stop pins penetrate through the corresponding avoiding holes when the locking rod rotates to different angles.

Optionally, the locking rod is provided with a positioning step, the spring is sleeved on the locking rod, and two ends of the spring are respectively abutted against the support and the positioning step.

Optionally, the cross sections of the lower straight beam and the upper straight beam are C-shaped, and the upper straight beam is sleeved on the periphery of the lower straight beam.

The application provides a counterweight housing with adjustable height, through the slide between the guiding mechanism realization last straight beam and the lower straight beam and with straight beam and lower straight beam relative sliding position in lockpin device locking, reach the purpose of adjusting counterweight housing height, prevent simultaneously to appear the dangerous operating mode such as horizontal hunting rocking to counterweight housing when height-adjusting, realize the simple easy operation of process of touching through the lockpin device to the installation inconvenience brought through the bolt fastening has been avoided.

Drawings

Fig. 1 is a schematic structural view of a height-adjustable counterweight housing according to an embodiment of the present disclosure;

FIG. 2 is a front view of the height adjustable counterweight housing shown in FIG. 1;

fig. 3 is a cross-sectional view of the height adjustable counterweight housing shown in fig. 1 at a-a;

FIG. 4 is a side view of the height adjustable counterweight housing shown in FIG. 1;

FIG. 5 is a top view of the height adjustable counterweight housing shown in FIG. 1;

FIG. 6 is a schematic view of an assembly structure of a guide slide rail and a guide slider in the height adjustable counterweight housing shown in FIG. 1;

fig. 7 is a schematic structural view of one limit position of the height adjustable counterweight housing shown in fig. 1;

fig. 8 is a schematic structural view of the height adjustable counterweight bracket shown in fig. 7 in the direction B;

fig. 9 is a schematic structural view of the height-adjustable counterweight housing shown in fig. 1, which is limited at another limit;

fig. 10 is a partially enlarged schematic view of the height adjustable counterweight support shown in fig. 9 at C;

FIG. 11 is a schematic structural view of a locking pin device in the height adjustable counterweight housing shown in FIG. 1;

FIG. 12 is a schematic view of the locking pin arrangement of FIG. 11 in an unlocked position and in an assembled configuration with the straight beam;

FIG. 13 is a schematic view of the latch device of FIG. 11 assembled to the straight beam in the locked position.

The reference numerals in the figures are illustrated as follows:

100. a counterweight housing; 10. a straight beam; 11. an upper straight beam; 12. a lower straight beam; 13. a guide mechanism; 131. a guide slide rail; 132. a guide slider; 14. a locking pin arrangement; 141. a support; 1411. a slide hole; 1412. avoiding holes; 1413. a first baffle plate; 1414. a second baffle; 1415. a third baffle plate; 142. a lock lever; 1421. positioning a step; 143. a spring; 144. a stop pin; 145. a force application member; 15. a limiting mechanism; 151. a first stopper; 152. a second stopper; 1521. a fixing sheet; 1522. a stopping sheet; 15. a limiting hole; 16. an adjustment hole; 20. a top beam; 30. a bottom beam; 41. a lower guide shoe; 42. an upper guide shoe; 43. and a cushion block.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 13 together, an embodiment of the present invention provides a height adjustable type counterweight housing 100, which includes two oppositely disposed straight beams 10, and a top beam 20 and a bottom beam 30 respectively connected between the two straight beams 10, wherein the top beam 20 is connected to the top of the two straight beams 10, and the bottom beam 30 is connected to the bottom of the two straight beams 10, thereby forming an integral frame of the counterweight housing 100.

Each straight beam 10 comprises an upper straight beam 11 and a lower straight beam 12, the upper straight beam 11 is fixedly connected with a top beam 20, the lower straight beam 12 is fixedly connected with a bottom beam 30, and the upper straight beam 11 is in sliding fit with the lower straight beam 12. Each of the straight beams 10 is any one of two straight beams 10 oppositely disposed at both ends of the top beam 20 and the bottom beam 30.

The upper straight beam 11 and the lower straight beam 12 are guided by the guide mechanism 13 to realize sliding fit between the upper straight beam 11 and the lower straight beam 12, and the position of the upper straight beam 11 and the lower straight beam 12 sliding relatively is maintained by the lock pin device 14, that is, the lock pin device 14 can fix the upper straight beam 11 and the lower straight beam 12 at a required position. The limiting mechanism 15 is arranged between the upper straight beam 11 and the lower straight beam 12 to limit the limit sliding position of the upper straight beam 11 and the lower straight beam 12.

The height-adjustable counterweight housing 100 provided by the embodiment realizes that the upper straight beam 11 and the lower straight beam 12 slide through the guide mechanism 13 and the upper straight beam 11 and the lower straight beam 12 are locked by the lock pin device 14 at the relative sliding position, so that the purpose of adjusting the height of the counterweight housing 100 is achieved, meanwhile, dangerous working conditions such as left-right swinging and shaking of the counterweight housing 100 during height adjustment are prevented, the simple and easy operation of the touch process is realized through the lock pin device 14, and the inconvenience in installation caused by bolt fixing is avoided.

The guide mechanism 13 includes a guide rail 131 and a guide slider 132 that are slidably engaged with each other, and one of the guide rail 131 and the guide slider 132 is fixed to the lower straight beam 12, and the other is fixed to the upper straight beam 11. It will be appreciated that in other embodiments, the guide mechanism 13 may also be adapted in such a way that the moving member of the rolling friction guide cooperates with the guide member. The straight beam 10 on which the guide rail 131 is located is provided with an adjustment hole 16, and a connecting member, which may be a bolt, for example, is arranged on the guide rail 131 through the adjustment hole 16. The straight beam 10 where the guide sliding block 132 is located is provided with a mounting hole, and the guide sliding block 132 is fixed on the straight beam 10 through the cooperation of the mounting hole and a bolt.

In one embodiment, the guide rail 131 is fixed to the upper straight beam 11, and the guide slider 132 is fixed to the lower straight beam 12. It is understood that in other embodiments, the guide slide rail 131 is fixed to the lower straight beam 12, and the guide slider 132 is fixed to the upper straight beam 11, as long as the guide slide rail 131 and the guide slider 132 can cooperate to enable the upper straight beam 11 and the lower straight beam 12 to slide relatively.

Specifically, the guide rail 131 is a linear guide rail, and the upper straight beam 11 and the lower straight beam 12 are driven linearly, so that the height of the counterweight housing 100 can be adjusted more easily, and the counterweight housing 100 can be prevented from swinging left and right.

The limiting mechanism 15 comprises a first stop member 151 and a second stop member 152, wherein the first stop member 151 is fixed on one of the upper straight beam 11 and the lower straight beam 12, and the guide slide rail 131 is installed on the one of the upper straight beam and the lower straight beam; the second stopper 152 is fixed to one of the upper straight beam 11 and the lower straight beam 12 to which the guide slider 132 is attached. The upper straight beam 11 and the lower straight beam 12 have two-limit sliding positions when sliding relatively, and the two-limit sliding positions are realized through the limiting mechanism 15.

It is understood that in one embodiment, the guide rail 131 is fixed to the upper straight beam 11, the guide slider 132 is fixed to the lower straight beam 12, and then the first stopper 151 is fixed to the upper straight beam 11 and the second stopper 152 is fixed to the lower straight beam 12. In another embodiment, the guide rail 131 is fixed to the lower straight beam 12, the guide slider 132 is fixed to the upper straight beam 11, and correspondingly, the first stopper 151 is fixed to the lower straight beam 12, and the second stopper 152 is fixed to the upper straight beam 11.

The upper straight beam 11 and the lower straight beam 12 have two sliding limit positions in the relative sliding process, wherein the two sliding limit positions are respectively a first limit position and a second limit position. When the upper straight beam 11 and the lower straight beam 12 relatively move away from each other and slide to the limit, the first stop member 151 abuts against the guide slide block 132 to reach a first limit; when the upper straight beam 11 and the lower straight beam 12 approach each other relatively and slide to the limit, the first stopper 151 abuts against the second stopper 152 to reach the second limit. Wherein, taking the orientation in fig. 1 as an example, when the lower straight beam 12 is relatively stationary, the relative distancing is understood as: the upper straight beam 11 moves upwards; relatively close is understood to mean: the upper straight beam 11 moves downward.

The first stopper 151 and the second stopper 152 are each one of the following structures: is in a block structure and is fixed on the straight beam 10; the L-shaped bending structure is characterized in that one side of an L-shaped corner is used as a fixing piece 1521 connected to the straight beam 10, and the other side of the L-shaped corner is used as a stopping piece 1522. It is understood that the first stopper 151 may have a block structure and the second stopper 152 has an L-shaped bent structure, or both the first stopper 151 and the second stopper 152 have a block structure and both the first stopper 151 and the second stopper 152 have an L-shaped bent structure.

In one embodiment, the first stopper 151 is a block structure fixed to the upper straight beam 11; the second stopper 152 has an L-shaped bent structure and is fixed to the lower straight beam 12. Referring to fig. 6 to 10, the second stopping member and the guiding sliding block 132 are both disposed on the lower straight beam 12, the first stopping member 151 is disposed at the bottom of the guiding sliding rail 131, the cross section of the first stopping member 151 is larger than that of the guiding sliding rail 131, and when the guiding sliding rail 131 slides relative to the guiding sliding block 132 to reach the first limit position, the first stopping member 151 abuts against the guiding sliding block 132. When the guide rail 131 slides relative to the guide slider 132 to reach the second limit position, the first stopper 151 abuts against the stopper 1522 of the second stopper 152.

Specifically, the distance between the second stopper 152 and the guide slider 132 is a stroke for height adjustment of the bogie 100, and is about one third to two thirds of the height of the lower straight beam 12, and preferably one half of the height of the lower straight beam 12. The material of the first stopper 151 is not limited. Preferably rubber.

In order to facilitate the installation of the locking pin device 14, the lower straight beam 12 and the upper straight beam 11 are respectively provided with a limiting hole 15 matched with the locking pin device 14, and the locking pin device 14 can be one or more. Referring to fig. 11 to 13, the latch device 14 includes a bracket 141, a lock rod 142, a spring 143, and a stop pin 144 fixed on the lock rod 142, wherein the spring 143 drives the lock rod 142 to enter the limiting hole 15 and enter a locking position, so as to maintain the relative sliding position of the upper straight beam 11 and the lower straight beam 12. The lock rod 142 is separated from the limiting hole 15, and when the stop pin 144 abuts against the bracket 141, the locking position is released.

The bracket 141 is mounted to the lower straight beam 12 or the upper straight beam 11, and in one embodiment, the bracket 141 is mounted to the upper straight beam 11 when the upper straight beam 11 is located at the outer periphery of the lower straight beam 12. It will be appreciated that in other embodiments, the bracket 141 may be mounted inside the straight beam 10, or the bracket 141 may be mounted against the lower straight beam 12 when the lower straight beam 12 is located at the outer periphery of the upper straight beam 11.

The lock rod 142 penetrates through the bracket 141 and is matched with the limiting hole 15, the spring 143 acts between the lock rod 142 and the bracket 141, the spring 143 drives the lock rod 142 to enter a locking position, when the lock position is achieved, the lock rod 142 sequentially penetrates through the bracket 141, the upper straight beam 11 and the lower straight beam 12 to fix the relative positions of the upper straight beam 11 and the lower straight beam 12, and the stop pin 144 abuts against the bracket 141 to keep the lock rod 142 at a release position.

In one embodiment, the support 141 is provided with a sliding hole 1411 for the passage of the lock rod 142 and an avoiding hole 1412 for the passage of the stop pin 144, the avoiding hole 1412 is located at the periphery of the locking position and is communicated with the sliding hole 1411, the stop pin 144 is aligned with the avoiding hole 1412 to allow the lock rod 142 to enter the locking position, and the stop pin 144 is dislocated in the avoiding hole 1412 to limit the lock rod 142 from extending into the limiting hole 15 to keep the lock rod 142 in the unlocking position. The stop pin 144 limits the lock rod 142 from extending into the limiting hole 15, and the spring 143 is in a compressed state.

Further, the bracket 141 includes a first baffle 1413, a second baffle 1415, and a third baffle 1415, which are sequentially arranged in parallel, each baffle is provided with a sliding hole 1411, the avoiding hole 1412 is formed at the first baffle 1413, the locking rod 142 sequentially passes through each baffle, and the third baffle 1415 abuts against the straight beam 10. In the unlocking position, the stop pin 144 is dislocated in the avoiding hole 1412 and abuts against the first baffle 1413, the lock rod 142 extends into the non-extending limiting hole 15, and the spring 143 is compressed; when the stopping pin 144 is aligned with the avoiding hole 1412, the locking rod 142 is not limited by the stopping pin 144, the spring 143 drives the locking rod 142 to extend into the limiting hole 15 due to the restoring force to form a locking position, and the stopping pin 144 passes through the avoiding hole 1412 and abuts against the second baffle 1414.

Specifically, the relief holes 1412 are radially distributed relative to the sliding holes 1411 to adapt to the stop pins 144 passing through the corresponding relief holes 1412 when the locking rod 142 rotates to different angles. Rotating lock bar 142 such that stop pin 144 is facing relief hole 1412, it is understood that relief hole 1412 can be two, four, or eight, etc. Preferably, the plurality of relief holes 1412 are distributed in a cross shape.

Further, one end of the lock rod 142 away from the limiting hole 15 is provided with a force application member 145 to drive the lock rod 142 to move. It is understood that the locking lever 142 is rotated or pulled to move the locking lever 142 by applying force to the locking lever 142 by the force applying member 145. Further, the force application member 145 is a pull ring, and the lock bar 142 is rotated by pulling the lock bar 142 through the pull ring, so that the stop pin 144 has a gap with the first baffle 1413, which facilitates the rotation of the lock bar 142 and reduces friction.

More specifically, the locking rod 142 is provided with a positioning step 1421, the spring 143 is sleeved on the locking rod 142, and two ends of the spring 143 are respectively abutted against the bracket 141 and the positioning step 1421. Further, one end of the spring 143 abuts against the positioning step 1421, and the other end abuts against the second baffle 1414. In another embodiment, two positioning steps 1421 are disposed on the lock rod 142, and two ends of the spring 143 respectively abut between the two positioning steps 1421.

In another embodiment, the cross section of the lower straight beam 12 and the cross section of the upper straight beam 11 are C-shaped, and the upper straight beam 11 is sleeved on the outer periphery of the lower straight beam 12, so that the upper straight beam 11 and the lower straight beam 12 can be conveniently installed, and the upper straight beam 11 slides relative to the lower straight beam 12. The upper straight beam 11 comprises a bottom plate and two side edges, the bottom plate and the two side edges enclose a C shape, the adjusting hole 16 is formed in the bottom plate, the limiting hole 15 is formed in the side edge, specifically, the lock pin device 14 is formed in the front end face of the upper straight beam 11, and the guide slide rail 131 is formed in the inner side of the upper straight beam 11, based on the orientation shown in fig. 1.

Because the upper straight beam 11 is sleeved on the periphery of the lower straight beam 12, a certain distance exists between the outer side of the upper straight beam 11 and the outer side of the lower straight beam 12 in the horizontal direction, and two ends of the two opposite lower straight beams 12 in the horizontal direction are respectively provided with the lower guide shoes 41; two ends of two opposite upper straight beams 11 along the horizontal direction are respectively provided with an upper guide shoe 42, and by additionally arranging cushion blocks 43 at two ends of the lower straight beam 12, one end of each cushion block 43 is attached to the lower straight beam 12, and the other end of each cushion block 43 is attached to the lower guide shoe 41, so that the lower guide shoe 41 and the upper guide shoe 42 are flush in the vertical direction.

When the height of the top layer of the hoistway is not enough, the upper straight beam 11 is slowly descended by the lifting tool under the matching of the line rail of the guide slide rail 131 and the guide slide block 132. When the height is lowered to a proper level, the force application piece 145 on the locking pin device 14 on the upper straight beam 11 is pulled to drive the locking rod 142 to rotate for a certain angle, the stop pin 144 passes through the avoiding hole 1412, so that the stop pin 144 abuts against the second baffle 1414 for limiting, and is released by the compression spring 143, and the locking rod 142 is pushed to penetrate into the corresponding limiting hole 15 of the lower straight beam 12 to reach the locking position.

On the contrary, when the height of the counterweight housing 100 needs to be adjusted again, the locking device 14 needs to be unlocked first, the locking rod 142 is rotated by a certain angle by rotating the force applying member 145, so that the stopping pin 144 passes through the avoiding hole 1412 again, and then the locking pin 144 is rotated by a certain angle again to avoid the avoiding hole 1412 and abut against the first baffle 1413, so that the spring 143 is compressed, and the unlocking position is formed.

The application provides a height-adjustable counterweight housing 100, this counterweight housing 100 carries out linear drive through controlling both ends linear guide, can prevent that dangerous operating mode such as the horizontal hunting from appearing when height-adjusting from counterweight housing 100 from appearing and rocking appears, when the rear is accomplished to counterweight housing 100 altitude mixture control, the accessible touches lockpin device 14 and locks straight roof beam 11, the relative position of straight roof beam 12 down, lockpin device 14 touches the simple easy operation of process, thereby the inconvenient problem of installation brought through the bolt fastening has been avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a height-adjustable counterweight housing, includes two straight beams of arranging relatively, connects back timber and floorbar between two straight beams respectively, its characterized in that, each straight beam includes:

an upper straight beam fixedly connected to the top beam;

2. The height-adjustable counterweight housing as claimed in claim 1, wherein said guide mechanism comprises a guide rail and a guide slider slidably engaged with each other;

3. The height adjustable counterweight housing as claimed in claim 2, wherein said limiting mechanism comprises:

4. The height adjustable counterweight housing as claimed in claim 3, wherein said first and second stops are each one of the following:

the beam is in a block structure and is fixed on the straight beam;

5. The height-adjustable counterweight housing as claimed in claim 1, wherein said lower straight beam and said upper straight beam are respectively provided with a limiting hole for engaging with said locking pin device;

the latch device includes:

the bracket is attached to the lower straight beam or the upper straight beam;

6. The height-adjustable counterweight housing as claimed in claim 5, wherein said housing has a slide hole for the passage of the lock rod and an avoiding hole for the passage of the stop pin;

7. The height-adjustable counterweight housing as claimed in claim 6, wherein an end of said lock rod away from said limiting hole is provided with a force-applying member for driving the lock rod to move.

8. The height-adjustable counterweight frame as claimed in claim 6, wherein said avoiding holes are radially distributed relative to said sliding hole to adapt to the situation that the stop pin passes through the corresponding avoiding hole when said locking rod rotates to different angles.

9. The height-adjustable counterweight housing as claimed in claim 6, wherein said locking rod is provided with a positioning step, said spring is sleeved on the locking rod and two ends of the spring are respectively abutted against said bracket and said positioning step.

10. The height-adjustable counterweight housing as claimed in claim 1, wherein said lower straight beam and said upper straight beam are C-shaped in cross section, and said upper straight beam is sleeved on the outer periphery of said lower straight beam.