Compression spring with adjustable pre-tightening force

Abstract

The utility model relates to the technical field of springs, in particular to a compression spring with adjustable pretightening force. According to the technical scheme, the device comprises two spring seats, a compression spring is jointly and fixedly installed between the two spring seats, a first telescopic pipe is fixedly installed on one spring seat, a circular gear is rotatably installed on the first telescopic pipe, an adjusting screw rod is fixedly installed on the circular gear, a second telescopic pipe is fixedly installed on the other spring seat, and the adjusting screw rod is fixedly installed on the second telescopic pipe. A connecting cylinder is movably installed in the second telescopic pipe, and one end of the adjusting screw penetrates through the connecting cylinder and is in threaded connection with the connecting cylinder. The adjusting sleeve is rotated to drive the adjusting screw rod to rotate, in the rotating process of the adjusting screw rod, the distance between the connecting cylinder and the adjusting sleeve can be adjusted, after the length of the portion, extending out of the second telescopic pipe, of the first telescopic pipe is increased, the compression spring can be stretched, the compression spring can be adjusted without being detached, and the adjustment efficiency is improved. And the maintenance convenience of the compression spring is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to spring technical field especially relates to a kind of adjustable compression spring of pre-tightening force. BACKGROUND

[0002] Compression spring is the helical spring that bears to pressure, generally is pitch coil and has fixed wire diameter of metal wire etc., compression spring utilizes multiple open coils to provide resistance force to external load pressure, when compression spring changes from unfolded state to compressed state, it can push back to resist external pressure. The pre-tightening force of compression spring is affected after long time use, leading to its resilience ability reduction, to not affect the normal use of equipment, after compression spring is damaged, it needs to be disassembled and the two ends of spring are stretched to restore its pre-tightening force, or replace new spring.

[0003] But in actual use process, since compression spring is fixed on equipment, it is inconvenient to disassemble, but when stretching the two ends of spring, it must be disassembled for stretching operation, in the initial stage of pre-tightening force reduction of spring, it needs to be disassembled, otherwise it will affect the normal use of spring, increase the disassembly and assembly frequency of spring, obviously reduce the convenience of compression spring maintenance, therefore, the application proposes a kind of adjustable compression spring of pre-tightening force, which can be stretched without disassembly. UTILITY MODEL CONTENTS

[0004] The utility model aims at the problem of frequent disassembly and assembly when stretching the compression spring in the background art, and proposes a kind of adjustable compression spring of pre-tightening force, which can be stretched without disassembly.

[0005] The technical scheme of the utility model: a kind of adjustable compression spring of pre-tightening force, including two spring seats, two spring seats are fixedly installed with compression spring, and further include:

[0006] First telescopic pipe, the first telescopic pipe is fixed on one of spring seats, a circular gear is rotatably installed on the first telescopic pipe, and an adjusting screw is fixedly installed on the circular gear;

[0007] Second telescopic pipe, the second telescopic pipe is fixed on the other spring seat, one end of the first telescopic pipe is inserted into the second telescopic pipe and movably connected therewith, a connecting cylinder is movably installed in the second telescopic pipe, and one end of the adjusting screw passes through the connecting cylinder and is screw-connected therewith.

[0008] Optionally, one end of the first telescopic pipe is provided with a connecting pipe, one end of the connecting pipe is fixed on the matched spring seat, an adjusting sleeve is rotatably installed on the outer wall of the connecting pipe and the first telescopic pipe, and the circular gear is meshingly connected with the tooth groove provided on the inner wall of the adjusting sleeve.

[0009] Optionally, the bottom end of the adjusting sleeve is fixedly installed with a plurality of connecting blocks, one end of the connecting block is inserted into and movably connected with an annular groove opened on the outer pipe wall of the first telescopic pipe, a limiting sleeve is fixedly installed on the outer pipe wall of the connecting pipe and arranged above the adjusting sleeve.

[0010] Optionally, the top end and the bottom end of the circular gear are fixedly installed with limiting circular seats, one of the limiting circular seats is inserted into and rotatably connected with the connecting pipe, and the other limiting circular seat is inserted into and rotatably connected with the first telescopic pipe.

[0011] Optionally, two adjusting openings symmetrically arranged are opened on the pipe wall of the second telescopic pipe, two limiting blocks are fixedly installed on the outer side wall of the connecting cylinder, and the limiting blocks are inserted into and movably connected with the matched adjusting openings.

[0012] Optionally, an internally threaded through opening is opened on the connecting cylinder, one end of the adjusting screw is inserted into and threadedly connected with the internally threaded through opening, and an adjusting slot is opened on the outer side wall of the limiting block.

[0013] Optionally, an assembling opening is opened on the outer side wall of the spring seat, an internally threaded hole is opened on the spring seat, the internally threaded hole is in communication with the matched assembling opening, and a plurality of clamping slots are opened on the spring seat.

[0014] Compared with the prior art, the application has at least one of the following beneficial technical effects:

[0015] The adjusting screw is driven to rotate by rotating the adjusting sleeve, the adjusting screw is threadedly connected with the connecting cylinder, and the connecting cylinder is limited by the adjusting opening, so that the adjusting screw cannot rotate with the connecting cylinder, the distance between the connecting cylinder and the adjusting sleeve can be adjusted during the rotation of the adjusting screw, and when the length of the first telescopic pipe extending to the outside of the second telescopic pipe increases, the compression spring can be stretched without being disassembled, so that the convenience of maintaining the compression spring is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure schematic diagram of the utility model is given;

[0017] Figure 2 The second telescopic pipe sectional view of the utility model is given;

[0018] Figure 3 The first telescopic pipe sectional view of the utility model is given;

[0019] Figure 4 The Figure 3 The enlarged schematic diagram of A is given;

[0020] Figure 5 The figure is a schematic view of the spring seat structure.

[0021] Reference numerals: 1, spring seat; 11, assembly opening; 12, internally threaded hole; 13, bayonet;

[0022] 2, compression spring;

[0023] 3, first telescopic tube; 31, connecting tube; 311, limiting collar; 32, circular gear; 321, limiting circular seat; 33, adjusting screw;

[0024] 4, second telescopic tube; 41, connecting cylinder; 42, internally threaded through opening; 43, limiting block; 44, adjusting slot;

[0025] 5, adjusting opening;

[0026] 6, adjusting sleeve; 61, connecting block. DETAILED DESCRIPTION

[0027] The technical scheme of the utility model is further described below in combination with the drawings and specific embodiments.

[0028] EMBODIMENT

[0029] As Figures 1-5 shown in the figure, the utility model provides a compression spring capable of adjusting pre-tightening force, which comprises two spring seats 1, a compression spring 2 is fixedly installed between the two spring seats 1, one of the spring seats 1 is fixedly installed with a first telescopic tube 3, and the other spring seat 1 is fixedly installed with a second telescopic tube 4; one end of the first telescopic tube 3 is inserted into the second telescopic tube 4 and is movably connected with the second telescopic tube 4; the telescopic structure composed of the first telescopic tube 3 and the second telescopic tube 4 is arranged at the middle position of the compression spring 2, thereby improving the probability of the compression spring 2 being twisted and deformed; the first telescopic tube 3 is rotatably installed with a circular gear 32, and the circular gear 32 is fixedly installed with an adjusting screw 33; the second telescopic tube 4 is movably installed with a connecting cylinder 41 inside; one end of the adjusting screw 33 passes through an internally threaded through opening 42 drilled on the connecting cylinder 41 and is threadedly connected with the internally threaded through opening 42; a limiting block 43 is fixedly installed on the outer wall of the connecting cylinder 41 and is inserted into an adjusting opening 5 drilled on the wall of the second telescopic tube 4 and is movably connected with the adjusting opening 5, so that the connecting cylinder 41 is prevented from rotating with the adjusting screw 33; during the rotation of the adjusting screw 33, the connecting cylinder 41 is positioned, and the second telescopic tube 4 is pushed to move away from the first telescopic tube 3, thereby achieving the stretching treatment effect on the compression spring 2, and the compression spring 2 can be stretched and adjusted without being disassembled.

[0030] Further, one end of the first telescopic pipe 3 is provided with a connecting pipe 31, one end of the connecting pipe 31 is fixed on the matched spring seat 1, the connecting pipe 31 and the outer wall of the first telescopic pipe 3 are jointly rotatably installed with the adjusting sleeve 6, the circular gear 32 is arranged between the first telescopic pipe 3 and the connecting pipe 31, and the circular gear 32 is meshingly connected with the tooth groove arranged on the inner wall of the adjusting sleeve 6, when the adjusting sleeve 6 is adjusted to rotate, the circular gear 32 and the adjusting screw 33 can be driven to rotate, thereby effectively improving the convenience of the adjusting screw 33 when being adjusted to rotate.

[0031] Secondly, the bottom end of the adjusting sleeve 6 is fixedly installed with a plurality of connecting blocks 61, one end of the connecting block 61 is inserted into and movably connected with the annular groove opened on the outer wall of the matched first telescopic pipe 3, so that the adjusting sleeve 6 can be stably rotatably installed on the first telescopic pipe 3, during the installation of the adjusting sleeve 6, the end of the connecting block 61 is first inserted into the annular groove, then the adjusting sleeve 6 is sleeved on the first telescopic pipe 3, and finally the part of the connecting block 61 in contact with the adjusting sleeve 6 is welded and fixed, thereby facilitating the installation of the adjusting sleeve 6; the outer wall of the connecting pipe 31 is fixedly installed with a limiting sleeve ring 311, after the installation of the adjusting sleeve 6 is completed, the limiting sleeve ring 311 is sleeved on the connecting pipe 31 and is welded and fixed on the outer wall of the connecting pipe 31, thereby limiting the adjusting sleeve 6 and improving the stability after installation.

[0032] Further, the top end and the bottom end of the circular gear 32 are fixedly installed with limiting circular seats 321, the limiting circular seat 321 arranged at the top end is inserted into and rotatably connected with the connecting pipe 31, and the limiting circular seat 321 arranged at the bottom end is inserted into and rotatably connected with the first telescopic pipe 3, after the connecting pipe 31 and the first telescopic pipe 3 limit the adjusting sleeve 6, the two ends of the circular gear 32 are limited by the connecting pipe 31 and the first telescopic pipe 3, thereby effectively improving the stability of the circular gear 32 after installation.

[0033] Secondly, the outer side wall of the limiting block 43 is opened with an adjusting slot 44, when it is necessary to stretch and adjust the compression spring 2, a tool (such as a spoon, a metal insertion rod, etc.) can be inserted into the adjusting slot 44, thereby temporarily fixing the limiting block 43, and after the stretch adjustment of the compression spring 2 is completed, the tool is pulled out, at this time, the connecting cylinder 41 can move in the second telescopic pipe 4, and after the compression spring 2 is subjected to pressure, it can normally compress and rebound, thereby avoiding hindering the compression and rebound of the compression spring 2.

[0034] It is worth mentioning that the spring seat 1 is provided with a clamping hole 13, and when the spring seat 1 is installed, the clamping hole 13 is butted on the clamping block of the equipment, so that the spring seat 1 is accurately positioned; the outer side wall of the spring seat 1 is provided with an assembly opening 11, which is communicated with the internal threaded hole 12 of the spring seat 1; the bolt is inserted into the internal threaded hole 12 from the assembly opening 11, and the nut at the end of the bolt is rotated by using a wrench, so that the end of the bolt is rotated into the assembly screw hole of the equipment, and the spring seat 1 is firmly connected with the equipment.

[0035] In the embodiment, the spring seat 1 is first fixedly installed on the equipment by using the bolt, so that the compression spring 2 is installed between two movable parts, and under the limiting of the telescopic structure composed of the first telescopic pipe 3 and the second telescopic pipe 4, the compression spring 2 can be prevented from being twisted and deformed; since the telescopic structure can be telescopically adjusted, when the compression spring 2 is subjected to pressure, the first telescopic pipe 3 is inserted into the second telescopic pipe 4, and when the compression spring 2 is in a completely compressed state, the first telescopic pipe 3 is completely inserted into the second telescopic pipe 4, so that the compression spring 2 is not hindered in the process of entering the compressed state.

[0036] After the compression spring 2 is installed for the first time, the connecting cylinder 41 can be arranged at the middle part of the second telescopic pipe 4, so as to reserve sufficient stretching distance for later stretching adjustment; when the compression spring 2 is used for a period of time, the pre-tightening force thereof is reduced, and in order to restore the pre-tightening force of the compression spring 2 to the initial state, the compression spring 2 needs to be stretched and adjusted; at this time, the instrument (such as a screwdriver, a metal insertion rod, etc.) is inserted into the adjusting slot 44, then the connecting cylinder 41 is fixed, the adjusting sleeve 6 is rotated and drives the adjusting screw 33 to rotate; since the adjusting screw 33 is threadedly connected with the connecting cylinder 41, and the connecting cylinder 41 is limited by the adjusting opening 5 and cannot rotate with the adjusting screw 33, the connecting cylinder 41 can move in the vertical direction along the inner wall of the second telescopic pipe 4; when the connecting cylinder 41 moves to the side of the first telescopic pipe 3, the adjusting screw 33 and the first telescopic pipe 3 are pushed to move away from the second telescopic pipe 4, so that the compression spring 2 is stretched and adjusted; in the whole stretching adjustment process, only the compression spring 2 is slightly adjusted, so that the pre-tightening force thereof can be restored, and the structure stability of the compression spring 2 is not affected by excessive stretching; compared with the traditional spring pre-tightening force adjustment, the compression spring 2 in the present application can be adjusted without being disassembled, and for the spring parts that need to be frequently maintained, the problem of increased operation difficulty caused by frequent disassembly and assembly is solved, and the convenience of maintaining the compression spring 2 is effectively improved.

[0037] The above specific embodiments are only several optional embodiments of the present application, and based on the technical scheme of the present application and the related enlightenment of the above embodiments, the person skilled in the art can make various alternative improvements and combinations on the above specific embodiments.

Claims

1. An adjustable pre-tension compression spring comprising two spring seats (1), a compression spring (2) is fixedly installed between the two spring seats (1) together, characterized in that, Also include: The first telescopic pipe (3), one of the spring seat (1) is fixed, the first telescopic pipe (3) on the rotary installation has a circular gear (32), the circular gear (32) is fixedly installed with adjusting screw rod (33); The second telescopic pipe (4), the second telescopic pipe (4) is fixed on the other spring seat (1), one end of the first telescopic pipe (3) is inserted into the second telescopic pipe (4) and is movably connected, the second telescopic pipe (4) movably installs a connecting cylinder (41) inside, one end of the adjusting screw rod (33) passes through the connecting cylinder (41) and is screw connected with it.

2. The adjustable preloaded compression spring of claim 1, wherein, One end of the first telescopic pipe (3) is provided with a connecting pipe (31), one end of the connecting pipe (31) is fixed on the matched spring seat (1), the connecting pipe (31) and the outer wall of the first telescopic pipe (3) are rotatably installed with adjusting sleeve (6), the circular gear (32) is engaged with the tooth groove arranged on the inner wall of the adjusting sleeve (6).

3. The adjustable preloaded compression spring of claim 2, wherein, The bottom end of the adjusting sleeve (6) is fixedly installed with a plurality of connecting blocks (61), one end of the connecting block (61) is inserted into the annular groove drilled on the outer pipe wall of the first telescopic pipe (3) and is movably connected, the outer pipe wall of the connecting pipe (31) is fixedly installed with a limiting sleeve ring (311), the limiting sleeve ring (311) is arranged above the adjusting sleeve (6).

4. The adjustable preloaded compression spring of claim 3, wherein, The top end and the bottom end of the circular gear (32) are fixedly installed with a limiting circular seat (321), one of the limiting circular seat (321) is inserted into the connecting pipe (31) and is rotatably connected, the other limiting circular seat (321) is inserted into the first telescopic pipe (3) and is rotatably connected.

5. The adjustable preloaded compression spring of claim 1, wherein, The pipe wall of the second telescopic pipe (4) is drilled with two symmetrically arranged adjusting openings (5), the outer side wall of the connecting cylinder (41) is fixedly installed with two limiting blocks (43), the limiting block (43) is inserted into the matched adjusting opening (5) and is movably connected.

6. The adjustable preloaded compression spring of claim 5, wherein, The connecting cylinder (41) is drilled with an internal thread through hole (42), one end of the adjusting screw rod (33) passes through the internal thread through hole (42) and is screw connected with it, the outer side wall of the limiting block (43) is drilled with an adjusting slot (44).

7. The adjustable preloaded compression spring of claim 1, wherein, The outer side wall of the spring seat (1) is drilled with an assembly opening (11), the spring seat (1) is drilled with an internal thread hole (12), the internal thread hole (12) is communicated with the matched assembly opening (11), the spring seat (1) is drilled with a plurality of clamping openings (13).

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