CN219015902U

CN219015902U - PC steel bar stress relaxation testing machine

Info

Publication number: CN219015902U
Application number: CN202320009885.6U
Authority: CN
Inventors: 王聪; 王凯; 王新雨
Original assignee: Jinan New Gold Testing Machine Co ltd
Current assignee: Jinan New Gold Testing Machine Co ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-05-12
Anticipated expiration: 2033-01-04

Abstract

The utility model relates to the technical field of steel stress tests, in particular to a PC steel bar stress relaxation testing machine. The utility model comprises a frame, a case and a propelling screw rod, wherein the case is arranged on one side of the frame, the propelling screw rod is arranged on the upper part of the frame, a motor is arranged in the case, the motor is connected with the propelling screw rod through a transmission device, a pull head is arranged at the front end part of the propelling screw rod, a fixed jaw is fixedly arranged on the motor corresponding to the pull head in level, and a force sensor is arranged at the fixed jaw. The frame is used for installing test instruments, the machine case is used for installing transmission components and power devices, the machine case is closed to be favorable for reducing dust entering the transmission components to influence transmission quality, noise is effectively reduced simultaneously, the PC steel bar is pulled through the pushing screw rod and is based on PC steel bar tensile stress and compressive stress, the stress on the PC steel bar is detected through the force sensor, and the change and damage of the PC steel bar under the stress state are automatically tested.

Description

PC steel bar stress relaxation testing machine

Technical Field

The utility model relates to the technical field of steel stress tests, in particular to a PC steel bar stress relaxation testing machine.

Background

The high-rise building foundation pipe pile mainly uses PC steel bars, so that the high-rise building foundation pipe pile is very important for mechanical property detection of the PC steel bars, and has the characteristics of high strength toughness, low relaxation, strong bond strength with concrete, good weldability, upsetting property, material saving and the like, so that the high-rise building foundation pipe pile is widely applied to prestressed components such as high-strength prestressed concrete centrifugal pipe piles, electric poles, overhead piers, railway sleepers and the like.

The existing PC steel bar has the defects of poor performance uniformity, severe upsetting phenomenon, insufficient straightness, high looseness and the like in the processing process, so that the PC steel bar needs to be tested, fatal defects in use are reduced, and clamping of a sample, stable loading of initial force and long-time deformation are difficult in a relaxation test due to high tensile strength and high hardness of the PC steel bar.

Disclosure of Invention

In order to solve the problem of unstable tensile test of a PC steel bar, an effective tensile stress relaxation test device for the PC steel bar is provided.

The utility model provides a PC steel bar stress relaxation testing machine which adopts the following technical scheme:

the utility model provides a PC steel bar stress relaxation testing machine, includes frame, quick-witted case and propulsion lead screw, the machine case sets up in frame one side, the propulsion lead screw is installed on frame upper portion, the motor is installed to the quick-witted incasement, the motor passes through transmission and propulsion lead screw connection, propulsion lead screw and screw threaded connection, screw fixed mounting is in the frame, propulsion lead screw front end is provided with the pull head, fixed mounting has fixed jaw on the motor that corresponds with the pull head level, fixed jaw department is provided with force transducer.

Through adopting above-mentioned technical scheme, the frame is used for installing test instrument, and the machine case is used for installing transmission component and power device, and quick-witted case seals and helps reducing dust and gets into transmission component influence transmission quality, and effective noise abatement simultaneously, through pushing up lead screw pulling PC steel bar based on PC steel bar tensile stress and compressive stress to detect the stress size on the PC steel bar through force sensor, the accurate stress of control applys on the PC steel bar, the change and the damage of automatic test PC steel bar under stress state.

Preferably, a screw rod support is arranged on the frame, and the propelling screw rod is rotatably installed with the screw rod support through a bearing.

Through adopting above-mentioned technical scheme, the lead screw supports and effectively supports the propulsion lead screw and guarantees the level steady operation of propulsion lead screw, reduces the skew of lead screw and influences test data.

Preferably, a nut sleeve is arranged on the frame, and the nut is fixedly arranged on the frame through the nut sleeve.

By adopting the technical scheme, the nut sleeve is used for fixing the nut, and the nut is fixed to be favorable for the uniform operation of the propelling screw.

Preferably, a third travel rod is arranged at the end part of the pushing screw rod, a second travel rod is arranged on the third travel rod, and a first travel rod is arranged at a position, corresponding to the second travel rod, on the frame.

By adopting the technical scheme, the first row Cheng Gan, the second stroke rod and the third stroke rod are combined to form stroke limitation, so that the operation of the propelling screw is prevented from being separated from mechanical fixation.

Preferably, the side panel is installed to frame lower part side, the bottom surface of frame lower part installs the bottom plate, and two adjacent side panels pass through angle bar connection fixed.

Preferably, the bottom of the frame is provided with a supporting leg.

Preferably, a support rod is arranged on the side surface of the upper part of the frame.

By adopting the technical scheme, the supporting rod is used for keeping the distance between one side of the pull head and one side of the fixed jaw unchanged.

Preferably, a speed reducer is arranged between the motor and the propelling screw rod, the motor is connected with the speed reducer through a first belt, and the propelling screw rod is connected with the speed reducer through a second belt.

Through adopting above-mentioned technical scheme, through reduction gear adjustment motor speed, improve the moment of torsion when reducing the rotational speed.

Preferably, the bottom of the pull head is provided with a linear guide rail, and the pull head is fixedly connected with the linear guide rail through a connecting rod.

By adopting the technical scheme, the linear guide rail is used for limiting the movement direction of the pull head, reducing the offset of the pull head and improving the precision and accuracy of the test.

Preferably, a position sensor is arranged at the position, corresponding to the pull head, of the frame.

Through adopting above-mentioned technical scheme, the position sensor is used for accurate detection pull head's travel distance, and then calculates the deformation data of PC steel bar.

In summary, the utility model has the following beneficial technical effects:

1. the frame is used for installing test instrument, and the machine case is used for installing transmission component and power device, and the machine case seals and helps reducing dust and gets into transmission component and influence transmission quality, and effective noise abatement simultaneously, pulls PC steel bar through the propulsion lead screw based on PC steel bar tensile stress and compressive stress to detect the stress size on the PC steel bar through force transducer, accurate control is applyed the stress on the PC steel bar, and automatic test PC steel bar is the change and the damage under stress state.

2. The screw rod supports effectively support the propelling screw rod and ensures horizontal stable operation of the propelling screw rod, deviation of the screw rod is reduced, test data is influenced, the screw sleeve is used for fixing the screw, the screw is fixed to be favorable for uniform operation of the propelling screw rod, and the first stroke rod, the second stroke rod and the third stroke rod are combined to form stroke limitation to prevent the propelling screw rod from being operated to be separated from mechanical fixation.

3. The bracing piece is used for the distance between pull head one side and the fixed jaw one side unchangeable, through reduction gear regulating motor speed, improves moment of torsion when reducing the rotational speed, and linear guide is used for restricting pull head direction of motion, reduces the skew of pull head, improves experimental precision and degree of accuracy, and the position sensor is used for the accurate travel distance who detects the pull head, and then calculates the deformation data of PC steel bar.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model.

Reference numerals illustrate:

1. the device comprises a rack, 10, a support rod, 11, side panels, 12, a bottom panel, 13, a support leg, 14, angle irons, 2, a case, 21, a motor, 22, a first belt, 23, a speed reducer, 24, a second belt, 3, a pushing screw, 30, a screw support, 31, a screw, 32, a screw sleeve, 33, a first row Cheng Gan, 34, a second travel rod, 35, a third travel rod, 4, a pull head, 41, a linear guide rail, 42, a connecting rod, 5, a force sensor, 6, a fixed jaw, 7 and a position sensor.

Detailed Description

The present utility model will be described in further detail with reference to fig. 1.

Example 1:

the embodiment of the utility model discloses a PC steel bar stress relaxation testing machine, which comprises a frame 1, a machine case 2 and a propelling screw rod 3, wherein the machine case 2 is arranged on one side of the frame 1, the propelling screw rod 3 is arranged at the upper part of the frame 1, a motor 21 is arranged in the machine case 2, the motor 21 is connected with the propelling screw rod 3 through a transmission device, the propelling screw rod 3 is in threaded connection with a nut 31, the nut 31 is fixedly arranged on the frame 1, a pull head 4 is arranged at the front end part of the propelling screw rod 3, a fixed jaw 6 is fixedly arranged on the motor 21 corresponding to the pull head 4 in a horizontal mode, and a force sensor 5 is arranged at the fixed jaw 6.

The embodiment of example 1 is:

when the device is used, one end of a PC steel bar is fixedly arranged on the fixed jaw 6, the other end of the PC steel bar is fixedly arranged on the pull head 4, the device is adjusted and reset to zero, the motor 21 is started and drives the propelling screw rod 3 to rotate, the propelling screw rod 3 rotates and drives the pull head 4 to move to apply tension and pressure to the PC steel bar, and the force sensor 5 monitors the applied force of the PC steel bar and transmits the applied force to the computer for data analysis.

Example 2:

the addition of the following components is based on the embodiment 1:

referring to fig. 1, the frame 1 is provided with a screw support 30, and the pushing screw 3 is rotatably mounted with the screw support 30 through a bearing.

Referring to fig. 1, the frame 1 is provided with a nut 32, and the nut 31 is fixedly mounted on the frame 1 through the nut 32.

Referring to fig. 1, a third travel bar 35 is disposed at the end of the pushing screw 3, a second travel bar 34 is disposed on the third travel bar 35, and a first travel bar 33 is disposed on the frame 1 corresponding to the second travel bar 34.

The embodiment of example 2 is:

by setting the lengths of the first stroke lever 33, the second stroke lever 34, and the third stroke lever 35, the first row Cheng Gan, the second stroke lever 34, and the third stroke lever 35 are blocked by contact with each other when the lead screw 3 moves, thereby controlling the moving distance of the lead screw 3.

Example 3:

the addition of the following components is based on the embodiment 1:

referring to fig. 1, a side panel 11 is installed on a side surface of the lower portion of the frame 1, a bottom panel 12 is installed on a bottom surface of the lower portion of the frame 1, and two adjacent side panels 11 are fixedly connected through an angle iron 14.

Referring to fig. 1, the bottom of the frame 1 is provided with a leg 13.

Referring to fig. 1, a support bar 10 is provided at an upper side of the frame 1.

Referring to fig. 1, a speed reducer 23 is disposed between the motor 21 and the push screw 3, the motor 21 is connected to the speed reducer 23 through a first belt, and the push screw 3 is connected to the speed reducer 23 through a second belt 24.

Referring to fig. 1, a linear guide 41 is disposed at the bottom of the slider 4, and the slider 4 is fixedly connected to the linear guide 41 by a connecting rod 42.

Referring to fig. 1, a position sensor 7 is disposed at a position of the frame 1 corresponding to the slider 4.

The embodiment of example 3 is:

the bit sensor 7 transmits the monitored displacement distance data to a computer for data analysis and display.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims

1. The PC steel bar stress relaxation testing machine is characterized in that: the device comprises a frame (1), a case (2) and a propelling screw rod (3), wherein the case (2) is arranged on one side of the frame (1), the propelling screw rod (3) is arranged on the upper portion of the frame (1), a motor (21) is arranged in the case (2), and the motor (21) is connected with the propelling screw rod (3) through a transmission device;

the propelling screw rod (3) is in threaded connection with the screw nut (31), and the screw nut (31) is fixedly arranged on the frame (1);

a pull head (4) is arranged at the front end part of the pushing screw (3), and a fixed jaw (6) is fixedly arranged on a motor (21) horizontally corresponding to the pull head (4);

a force sensor (5) is arranged at the fixed jaw (6).

2. The PC steel bar stress relaxation testing machine according to claim 1, wherein: the machine frame (1) is provided with a screw rod support (30), and the propelling screw rod (3) is rotatably installed with the screw rod support (30) through a bearing.

3. The PC steel bar stress relaxation testing machine according to claim 1, wherein: the machine frame (1) is provided with a nut sleeve (32), and the nut (31) is fixedly arranged on the machine frame (1) through the nut sleeve (32).

4. The PC steel bar stress relaxation testing machine according to claim 1, wherein: the end part of the propelling screw rod (3) is provided with a third travel rod (35), the third travel rod (35) is provided with a second travel rod (34), and a first travel rod (33) is arranged at a position corresponding to the second travel rod (34) on the frame (1).

5. The PC steel bar stress relaxation testing machine according to claim 1, wherein: side board (11) are installed to frame (1) lower part side, bottom surface board (12) are installed to frame (1) lower part bottom surface, and two adjacent side board (11) are fixed through angle bar (14) connection.

6. The PC steel bar stress relaxation testing machine according to claim 5, wherein: the bottom of the stand (1) is provided with supporting legs (13).

7. The PC steel bar stress relaxation testing machine according to claim 1, wherein: the side surface of the upper part of the frame (1) is provided with a supporting rod (10).

8. The PC steel bar stress relaxation testing machine according to claim 1, wherein: a speed reducer (23) is arranged between the motor (21) and the propelling screw (3), the motor (21) is connected with the speed reducer (23) through a first belt, and the propelling screw (3) is connected with the speed reducer (23) through a second belt (24).

9. The PC steel bar stress relaxation testing machine according to claim 1, wherein: the bottom of the pull head (4) is provided with a linear guide rail (41), and the pull head (4) is fixedly connected with the linear guide rail (41) through a connecting rod (42).

10. The PC steel bar stress relaxation testing machine according to claim 1, wherein: a position sensor (7) is arranged at the corresponding position of the frame (1) and the pull head (4).