CN112456035A - Hydraulic tensioning device test bed and test method thereof - Google Patents
Hydraulic tensioning device test bed and test method thereof Download PDFInfo
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- CN112456035A CN112456035A CN202011418471.6A CN202011418471A CN112456035A CN 112456035 A CN112456035 A CN 112456035A CN 202011418471 A CN202011418471 A CN 202011418471A CN 112456035 A CN112456035 A CN 112456035A
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- tensioning
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- cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/44—Belt or chain tensioning arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
Abstract
The invention discloses a test bed and a test method of a hydraulic tensioning device, wherein the test bed comprises a hydraulic pump station, a test bed and an electric cabinet, and a tensioning oil cylinder, a tensioning winch, a tensioning pulley and a steel wire rope fixing seat are arranged on the test bed; the tensioning winch is fixedly connected with the test bed through bolts; the tensioning pulley comprises an upper tensioning pulley and a lower tensioning pulley, a steel wire rope is arranged on the tensioning oil cylinder pulley of the tensioning oil cylinder, one side of the steel wire rope is connected with the steel wire rope fixing seat through the upper tensioning pulley, the other side of the steel wire rope is connected with a roller of the tensioning winch through the lower tensioning pulley, the hydraulic pump station is connected with the tensioning oil cylinder and provides pressure oil and system power for the tensioning oil cylinder, and the electric cabinet is respectively connected with the tensioning winch and the hydraulic pump station; the reasonable tension force required by the belt can be ensured.
Description
Technical Field
The invention relates to the technical field of belt conveyors, in particular to a test bed of a hydraulic tensioning device and a test method thereof.
Background
The belt conveyor can have the phenomena of extension, deformation and the like after running for a period of time. Since the elongation of the conveyor belt consists of elastic elongation and plastic elongation, a tensioning device is required to overcome the disadvantages of the elongated conveyor belt.
The hydraulic tensioning device is a novel product developed according to the running characteristics of the belt conveyor, stress model analysis and a large amount of experimental data. The belt tensioning device has the advantages that the requirements of the belt on tension force and buffering in starting, running and braking of the belt are met, the tensioning action of starting force and running tension force provided for the belt conveyor can be automatically realized, different requirements of slippage prevention and normal running of the belt on tension force during starting of the belt are met, and the reasonable tension force required by the belt cannot be controlled by an existing hydraulic tensioning device test bed.
Therefore, how to provide the test bed of the hydraulic tensioning device and the test method thereof can ensure reasonable tensioning force required by the belt, and becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a test bed of a hydraulic tensioning device and a test method thereof, and aims to solve the problem that the existing test bed of the hydraulic tensioning device in the background art cannot control reasonable tensioning force required by a belt.
In order to achieve the above object, the invention provides a hydraulic tensioning device test bed on one hand, which comprises a hydraulic pump station, a test bed and an electric cabinet, wherein a tensioning oil cylinder, a tensioning winch, a tensioning pulley and a steel wire rope fixing seat are arranged on the test bed; the tensioning winch is fixedly connected with the test bed through bolts; the tensioning pulley comprises an upper tensioning pulley and a lower tensioning pulley, a steel wire rope is arranged on the tensioning oil cylinder pulley of the tensioning oil cylinder, one side of the steel wire rope is connected with the steel wire rope fixing seat through the upper tensioning pulley, the other side of the steel wire rope is connected with a roller of the tensioning winch through the lower tensioning pulley, the hydraulic pump station is connected with the tensioning oil cylinder and provides pressure oil and system power for the tensioning oil cylinder, and the electric cabinet is respectively connected with the tensioning winch and the hydraulic pump station; and the pressure of the hydraulic system and the data read by the tension sensor are compared and checked to ensure that the tension is kept constant.
As a further improvement of the above scheme, a tension sensor is arranged between the steel wire rope fixing seat and the upper tensioning pulley.
As a further improvement of the scheme, the hydraulic pump station is also connected with an energy accumulator station which automatically tensions the tensioning oil cylinder.
As a further improvement of the scheme, the tensioning oil cylinder comprises a tensioning oil cylinder front cavity and a tensioning oil cylinder rear cavity, and the tensioning oil cylinder front cavity and the tensioning oil cylinder rear cavity are respectively arranged on the front side and the rear side of the tensioning oil cylinder and are connected with the hydraulic pump station.
As a further improvement of the scheme, the hydraulic pump station comprises a motor, an oil tank, a valve station and a pressure gauge, wherein an operation panel of the oil tank is fixedly provided with an integrated block, and different hydraulic valves and quick connectors are respectively arranged on the integrated block in each direction.
As a further improvement of the scheme, the quick connection-peg of the hydraulic pump station is respectively connected with the front cavity of the tensioning oil cylinder, the energy accumulator station and the rear cavity of the tensioning oil cylinder through oil pipes.
As a further improvement of the scheme, the tensioning oil cylinder is arranged on the test bed through a tensioning oil cylinder seat.
As a further improvement of the scheme, the top of the electric cabinet is fixedly connected with a control panel.
As a further improvement of the scheme, a switching power supply is fixedly connected to the inner part of the electric cabinet through bolts.
As a further improvement of the scheme, the switching power supply is connected with the hydraulic pump station and the tensioning winch through cables.
Another aspect of the present invention provides a hydraulic tensioner test rig test method comprising the steps of,
s1, sealing and pressure resistance of the hydraulic system: after a hydraulic pump station, a tensioning oil cylinder and an energy accumulator station are connected into a sealed system, a test is carried out, and when the pressure of the system rises to 1.5 times of the highest working pressure, a power supply is cut off; after the system pressure is maintained for 2 hours, measuring the pressure;
s2, working temperature of hydraulic medium: boosting the pressure of the hydraulic pump station to 1.5 times of the highest working pressure, then reducing the working pressure to zero, tensioning the oil cylinder to simultaneously complete one-time expansion, and measuring the temperature after 5 times of continuous operation;
and S3, checking the maximum tension and the working stroke: the tensioning device is arranged on the test bed, the hydraulic pump station is started, the highest working pressure is measured, the maximum tensioning force is calculated according to the effective cylinder diameter of the tensioning cylinder, and the working stroke is measured;
s4, hydraulic system pressure protection inspection: when the system pressure reaches the highest working pressure, the hydraulic pump station continues to work, and the working pressure of the system is checked;
s5, automatic pressure supplementing function test: adjusting the pressure of the system to enable the tension to be lower than the minimum tension, and checking whether the system automatically supplements pressure;
s6, noise checking: and measuring noise at five positions of the hydraulic pump station at a distance of 1 meter, wherein the measured horizontal height is the motor center height of the hydraulic pump station and is the maximum value.
Compared with the prior art, the invention has the beneficial effects that:
the test bench is used for the type test and the factory inspection of a whole set of series of tensioning devices, and the test can bear the maximum tensioning force of 900 KN; the hydraulic tensioning device test bed detects different tensioning signals through mechanical, electrical and hydraulic conversion by an electrical control system of an electric cabinet, gives out control signals according to a PLC control program of the electric cabinet, enables a mechanical part and a hydraulic part in the controlled system to work, is used for controlling reasonable tensioning force required by a belt, and the PLC control program can read data through a pressure sensor and a tension sensor of the hydraulic system to perform comparison and check, so that the tensioning force is kept constant.
The hydraulic tensioning device test bed has the characteristics of capability of automatically adjusting the tensioning force and quick response;
automatically adjusting the tension force: the hydraulic automatic tensioning device can randomly adjust the tensioning force of the starting brake and the normal operation state according to the working condition of the belt conveyor and different requirements on the tension of the conveying belt, so that the tensioning of the belt conveyor in the stable operation state is reduced by about 20 percent, the power of the conveyor is reduced, the strength grade of the conveying belt is reduced, and the investment and the maintenance cost of equipment are reduced.
The response is quick: when belt conveyor starts, the loose edge of conveyer belt can relax the extension suddenly, tensioning hydro-cylinder is under the effect of energy storage ware this moment, can contract the elongation that the piston rod compensated the conveyer belt at once, reduce the impact of the loose edge of conveyer belt to tight edge, make belt conveyor start steadily, reliably, protective apparatus, reduce the emergence of disconnected area accident, normal operating is undulant when external disturbance or conveyer belt tension produce, when making the conveyer belt stretch suddenly, the extension of the loose edge of conveyer belt can in time be absorbed to the energy storage ware, reduce the tensile undulant of conveyer belt, make the system be in the constant voltage state, prevent to skid.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of the hydraulic pump station.
In the drawings: 1 is a hydraulic pump station; 2 is a tensioning oil cylinder; 3 is a tension sensor; 4 is a tensioning winch; 5 is a tension pulley; 6 is an electric cabinet; 7 is a test stand; 8 is a steel wire rope fixing seat; 9 is an accumulator station; 21 is a tensioning oil cylinder front cavity; 22 is a tensioning cylinder rear cavity; 23 is a tensioning cylinder pulley; and 24 is a tensioning cylinder block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1, the invention discloses a test bed of a hydraulic tensioning device, which comprises a hydraulic pump station 1, a test bed 7 and an electric cabinet 6, wherein a tensioning oil cylinder 2, a tensioning winch 4, a tensioning pulley 5 and a steel wire rope fixing seat 8 are arranged on the test bed 7; the tensioning pulley 5 comprises an upper tensioning pulley and a lower tensioning pulley, a steel wire rope is arranged on a tensioning oil cylinder pulley 23 of the tensioning oil cylinder 2, one side of the steel wire rope is connected with the steel wire rope fixing seat 8 through the upper tensioning pulley, the other side of the steel wire rope is connected with a roller of the tensioning winch 4 through the lower tensioning pulley, the hydraulic pump station 1 is connected with the tensioning oil cylinder 2 and provides pressure oil and system power for the tensioning oil cylinder 2, and the electric cabinet 6 is respectively connected with the tensioning winch 4 and the hydraulic pump station 1; and a tension sensor 3 is arranged between the steel wire rope fixing seat 8 and the upper tensioning pulley.
The test bench is used for the type test and the factory inspection of a whole set of series of tensioning devices, and the test can bear the maximum tensioning force of 900 KN; the hydraulic tensioning device test bed detects different tensioning signals through mechanical, electrical and hydraulic conversion by an electrical control system of an electric control box 6, gives out control signals according to a PLC control program of the electric control box 6, enables a mechanical part and a hydraulic part in the controlled system to work and is used for controlling reasonable tensioning force required by a belt, and the PLC control program can read data through a pressure sensor and a tension sensor of the hydraulic system to compare and check, so that the tensioning force is kept constant.
The hydraulic pump station 1 is further connected with an energy accumulator station 9, the energy accumulator station 9 supplies power for the system when the hydraulic pump station 1 idles at intervals, when the tensioning device normally works, the hydraulic pump station 1 supplies oil intermittently, and the energy accumulator station 9 is used for realizing automatic tensioning of the tensioning oil cylinder 2 and a protection effect under special conditions, so that consumption is reduced, and energy consumption is reduced.
In the above embodiment, the tensioning cylinder 2 is arranged on the test bed 7 through the tensioning cylinder seat 24, wherein the tensioning cylinder seat 21 is fixedly connected with the test bed 7 through bolts when being connected with the test bed 7; when the tensioning winch 4 is connected with the test bed 7, the tensioning winch is fixedly connected with the test bed by bolts.
The tensioning oil cylinder 2 comprises a tensioning oil cylinder front cavity 21 and a tensioning oil cylinder rear cavity 22, and the tensioning oil cylinder front cavity 21 and the tensioning oil cylinder rear cavity 2 are respectively arranged on the front side and the rear side of the tensioning oil cylinder 2.
In the above embodiment, the hydraulic pump station 1 includes an electric motor, an oil tank, a valve station, a high pressure rubber tube and a pressure gauge, wherein an operation panel of the oil tank is fixedly provided with an integrated block, each direction of the integrated block is respectively provided with a hydraulic valve and a quick connector with different functions, the quick connector is connected with interfaces of each control component for realizing control of a hydraulic system of the tensioning device, the hydraulic system of the tensioning device controls an oil pump to receive power of the electric motor, and absorb oil from the oil tank and convey the oil to the valve station on the hydraulic station, wherein the valve station is formed by combining the integrated block, a manual reversing valve, an electromagnetic reversing valve, an overflow valve, a hydraulic control one-way valve and a hydraulic control reversing valve, when the hydraulic tensioning device is detected, the hydraulic pump station 1 is opened to act, the overflow valve on the upper side of the integrated block is loosened to the bottom, and the other safety overflow valve, at this time, the oil cylinder is in a tensioned state. And starting an oil pump, slowly screwing the safety overflow valve, observing a pressure gauge, stopping the overflow valve when the oil pressure is gradually increased to the specified high-pressure upper limit of 21MPa, slowly loosening the other overflow valve, observing the pressure gauge, and stopping the overflow valve when the oil pressure is gradually reduced to the normal working pressure of the system.
When the hydraulic pump station 1 is connected with the tensioning oil cylinder 2 and the energy accumulator station 9, the quick-connection connector of the hydraulic pump station 1 is respectively connected with the tensioning oil cylinder front cavity 21, the energy accumulator station 7 and the tensioning oil cylinder rear cavity 22 through oil pipes, and drives the hydraulic cylinder to act through the hydraulic pump station 1, wherein one of the quick-connection connectors is connected with a tee joint on the oil tank and an oil inlet close to the pulley on the hydraulic oil cylinder, and the other quick-connection connector is connected with an oil outlet on the integrated block on the oil tank and an oil inlet far away from the pulley on the hydraulic oil cylinder.
The top of the electric cabinet 6 is fixedly connected with a control panel, the bolt inside the electric cabinet 6 is fixedly connected with a switching power supply, and the switching power supply is connected with the hydraulic pump station 1 and the tensioning winch 4 through cables.
When the hydraulic tensioning device test bed is used for a type test project, the test comprises the following steps of,
sealing and pressure resistance of a hydraulic system: a hydraulic pump station, a tensioning oil cylinder and an energy accumulator station are connected into a sealed system according to the figure 1, then a test is carried out, and when the system pressure is increased to 1.5 times of the highest working pressure, a power supply is cut off; after the system pressure was maintained for 2h, the pressure was measured.
Working temperature of hydraulic medium: and boosting the pressure of the hydraulic pump station to 1.5 times of the highest working pressure, then reducing the working pressure to zero, tensioning the oil cylinders to simultaneously complete one-time expansion, and measuring the temperature after 5 times of continuous operation.
And (3) checking the maximum tension and the working stroke: the tensioning device is arranged on the test bed, the hydraulic pump station is started, the highest working pressure is measured, the maximum tensioning force is calculated according to the effective cylinder diameter of the tensioning cylinder, and the working stroke is measured.
Pressure protection and inspection of a hydraulic system: and when the system pressure reaches the highest working pressure, the hydraulic pump station continues to work, and the working pressure of the system is checked.
And (3) automatic pressure supplementing function inspection: and adjusting the pressure of the system to enable the tension to be lower than the minimum allowable tension, and checking whether the system is automatically pressurized.
And (3) noise inspection: according to the regulation of GB/T3768-1996, the noise is measured at the positions which are five positions on the front, the back, the left and the right of the hydraulic pump station and have the distance of 1 meter, the measured horizontal height is the motor center height of the hydraulic pump station, and the maximum value is taken.
According to the embodiment, the hydraulic tensioning device test bed has the characteristics of capability of automatically adjusting the tensioning force and quick response;
automatically adjusting the tension force: the hydraulic automatic tensioning device can randomly adjust the tensioning force of the starting brake and the normal operation state according to the working condition of the belt conveyor and different requirements on the tension of the conveying belt, so that the tensioning of the belt conveyor in the stable operation state is reduced by about 20 percent, the power of the conveyor is reduced, the strength grade of the conveying belt is reduced, and the investment and the maintenance cost of equipment are reduced.
The response is quick: when belt conveyor starts, the loose edge of conveyer belt can relax the extension suddenly, tensioning hydro-cylinder is under the effect of energy storage ware this moment, can contract the elongation that the piston rod compensated the conveyer belt at once, reduce the impact of the loose edge of conveyer belt to tight edge, make belt conveyor start steadily, reliably, protective apparatus, reduce the emergence of disconnected area accident, normal operating is undulant when external disturbance or conveyer belt tension produce, when making the conveyer belt stretch suddenly, the extension of the loose edge of conveyer belt can in time be absorbed to the energy storage ware, reduce the tensile undulant of conveyer belt, make the system be in the constant voltage state, prevent to skid.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A test bed of a hydraulic tensioning device is characterized by comprising a hydraulic pump station (1), a test bed (7) and an electric cabinet (6), wherein a tensioning oil cylinder (2), a tensioning winch (4), a tensioning pulley (5) and a steel wire rope fixing seat (8) are arranged on the test bed (7); the tensioning winch (4) is fixedly connected with the test bed (7) through bolts; tensioning pulley (5) are including last tensioning pulley and lower tensioning pulley, be provided with wire rope on tensioning cylinder pulley (23) of tensioning hydro-cylinder (2), one side of wire rope pass through last tensioning pulley with wire rope fixing base (8) are connected, wire rope's opposite side pass through down tensioning pulley with the cylinder of tensioning winch (4) is connected, hydraulic power unit (1) are connected with tensioning hydro-cylinder (2) and provide pressure oil and system power for it, electric cabinet (6) respectively with tensioning winch (4) and hydraulic power unit (1) are connected.
2. A hydraulic tensioner test stand as claimed in claim 1, characterized in that a tension sensor (3) is arranged between the wire rope fixing seat (8) and the upper tensioning sheave.
3. The hydraulic tensioning device test bed according to claim 2, characterized in that the hydraulic pump station (1) is further connected with an energy accumulator station (9) for automatically tensioning the tensioning cylinder (2).
4. The hydraulic tensioning device test bed according to claim 3, wherein the tensioning cylinder (2) comprises a tensioning cylinder front cavity (21) and a tensioning cylinder rear cavity (22), and the tensioning cylinder front cavity (21) and the tensioning cylinder rear cavity (2) are respectively arranged on the front side and the rear side of the tensioning cylinder (2) and are connected with the hydraulic pump station (1).
5. The test bed of the hydraulic tensioning device according to claim 4, wherein the hydraulic pump station (1) comprises a motor, an oil tank, a valve station and a pressure gauge, wherein an operation panel of the oil tank is fixedly provided with an integrated block, and different hydraulic valves and quick connectors are respectively arranged on the integrated block in each direction.
6. The hydraulic tensioning device test bed according to claim 5, wherein the quick connector of the hydraulic pump station (1) is connected with the tensioning cylinder front cavity (21), the energy accumulator station (9) and the tensioning cylinder rear cavity (22) through oil pipes respectively.
7. A hydraulic tensioner test stand according to claim 1, characterized in that the tensioning cylinder (2) is arranged on the test stand (7) by means of a tensioning cylinder seat (24).
8. A hydraulic tensioner test stand as claimed in claim 1, characterized in that the top of said electric cabinet (6) is fixedly connected to a control panel.
9. The hydraulic tensioning device test bed according to claim 8, characterized in that a switching power supply is fixedly connected to the inner bolt of the electric cabinet (6); the switching power supply is connected with the hydraulic pump station (1) and the tensioning winch (4) through cables.
10. A test method for a test bed of a hydraulic tensioning device is characterized by comprising the following steps,
s1, sealing and pressure resistance of the hydraulic system: after a hydraulic pump station, a tensioning oil cylinder and an energy accumulator station are connected into a sealed system, a test is carried out, and when the pressure of the system rises to 1.5 times of the highest working pressure, a power supply is cut off; after the system pressure is maintained for 2 hours, measuring the pressure;
s2, working temperature of hydraulic medium: boosting the pressure of the hydraulic pump station to 1.5 times of the highest working pressure, then reducing the working pressure to zero, tensioning the oil cylinder to simultaneously complete one-time expansion, and measuring the temperature after 5 times of continuous operation;
and S3, checking the maximum tension and the working stroke: the tensioning device is arranged on the test bed, the hydraulic pump station is started, the highest working pressure is measured, the maximum tensioning force is calculated according to the effective cylinder diameter of the tensioning cylinder, and the working stroke is measured;
s4, hydraulic system pressure protection inspection: when the system pressure reaches the highest working pressure, the hydraulic pump station continues to work, and the working pressure of the system is checked;
s5, automatic pressure supplementing function test: adjusting the pressure of the system to enable the tension to be lower than the minimum tension, and checking whether the system automatically supplements pressure;
s6, noise checking: and measuring noise at five positions of the hydraulic pump station at a distance of 1 meter, wherein the measured horizontal height is the motor center height of the hydraulic pump station and is the maximum value.
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| CN202011418471.6A CN112456035A (en) | 2020-12-07 | 2020-12-07 | Hydraulic tensioning device test bed and test method thereof |
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| CN202011418471.6A CN112456035A (en) | 2020-12-07 | 2020-12-07 | Hydraulic tensioning device test bed and test method thereof |
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| CA1135533A (en) * | 1980-11-24 | 1982-11-16 | Derald H. Kraft | Hydraulic belt tensioner construction |
| CN2841589Y (en) * | 2005-09-27 | 2006-11-29 | 中国矿业大学 | Numerical control winch and oil cylinder type hydraulic tensioning device |
| CN201265573Y (en) * | 2008-08-26 | 2009-07-01 | 比亚迪股份有限公司 | Test bed for hydraulic cylinder |
| CN204161961U (en) * | 2014-07-14 | 2015-02-18 | 徐州五洋科技股份有限公司 | Automatic Take-up Device for Belt Conveyor |
| CN204211037U (en) * | 2014-11-07 | 2015-03-18 | 天津滨创投资咨询有限公司 | A kind of hydraulic automatic tensioner system of belt conveyer |
| CN209352065U (en) * | 2018-12-14 | 2019-09-06 | 山东科大机电科技股份有限公司 | A kind of shield machine Hydranlic tensioner |
| CN210799575U (en) * | 2019-09-03 | 2020-06-19 | 江苏恒立液压科技有限公司 | Hydraulic system for testing performance of hydraulic cylinder |
-
2020
- 2020-12-07 CN CN202011418471.6A patent/CN112456035A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1135533A (en) * | 1980-11-24 | 1982-11-16 | Derald H. Kraft | Hydraulic belt tensioner construction |
| CN2841589Y (en) * | 2005-09-27 | 2006-11-29 | 中国矿业大学 | Numerical control winch and oil cylinder type hydraulic tensioning device |
| CN201265573Y (en) * | 2008-08-26 | 2009-07-01 | 比亚迪股份有限公司 | Test bed for hydraulic cylinder |
| CN204161961U (en) * | 2014-07-14 | 2015-02-18 | 徐州五洋科技股份有限公司 | Automatic Take-up Device for Belt Conveyor |
| CN204211037U (en) * | 2014-11-07 | 2015-03-18 | 天津滨创投资咨询有限公司 | A kind of hydraulic automatic tensioner system of belt conveyer |
| CN209352065U (en) * | 2018-12-14 | 2019-09-06 | 山东科大机电科技股份有限公司 | A kind of shield machine Hydranlic tensioner |
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Application publication date: 20210309 |
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