Tension test device and method for strap

Abstract

The invention discloses a tension test device and method for a strap. The device comprises a bottom plate, a plurality of lower pull rods, a supporting plate, a positioning block, a positioning sleeve, a clamping ring, a lug ring and a jack, the lower pull rod and the positioning block are fixedly mounted on the bottom plate; the supporting plate is mounted at the upper end of the lower pull rod; the jack is fixed on the supporting plate; each positioning block is of a cuboid-shaped structure with a semicircular groove formed in the upper end face, and the two positioning blocks are installed on the bottom plate in parallel. The positioning sleeve is supported in the semicircular grooves of the two positioning blocks; the top of each positioning block is provided with a clamping ring of a semicircular ring structure. The lug ring comprises a connecting shaft and a hanging ring arranged at the lower end of the connecting shaft, and two hanging ring holes are formed in the hanging ring and used for being connected with the two ends of the strap respectively; the upper end of the connecting shaft is connected with the output end of the jack through a tension-compression sensor. The device is simple and compact in structure, low in cost and convenient to operate; the tension test can be conveniently carried out on the strap piece by piece in real time in a production place, the product quality is ensured, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to a tension test device and method for a hoop, belonging to the technical field of measurement. Background Art

[0002] Some flying equipment requires steel straps to be used to vertically suspend and tighten hundreds of kilograms of weight. During flight, especially when the flying equipment is taking off and landing, the straps are subjected to great tension, so the mechanical performance quality of the straps is required to be high. In addition to testing the various mechanical properties of the raw materials of the straps and performing tensile tests on the finished straps, it is also necessary to conduct tensile tests on each strap piece by piece. That is, under the set safety tension, the strap is in good condition, without any deformation, and the mechanical properties are reliable and safe. The quality of the strap is qualified and can be put into use. All straps are subjected to tensile tests, and special tensile test equipment needs to be designed to complete the tensile test at the production site. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a strap tension testing device and method which has a simple structure, is easy to operate, and can test the mechanical properties of the strap.

[0004] The technical solution adopted by the present invention is: a hoop tension test device, comprising a bottom plate, a lower pull rod, a support plate, a positioning block, a positioning sleeve, a clamping ring, an earring and a jack; a plurality of lower pull rods and the positioning block are fixedly mounted on the bottom plate, and the lower pull rods are arranged perpendicular to the bottom plate; the support plate is mounted at the upper end of the lower pull rod, and the support plate is parallel to the bottom plate; the jack is fixed on the support plate; The positioning block is a rectangular structure with a semicircular groove on the upper end surface. The two positioning blocks are installed in parallel on the base plate, and the semicircular grooves of the two positioning blocks are coaxially arranged; the positioning sleeve is supported in the semicircular grooves of the two positioning blocks; a semicircular ring structured snap ring is installed on the top of each positioning block, and the snap ring positions the positioning sleeve circumferentially; the earring includes a connecting shaft and a lifting ring arranged at the lower end of the connecting shaft, the lifting ring is provided with two lifting ring holes, and the two lifting ring holes are respectively used to connect the two ends of the hoop; the upper end of the connecting shaft is connected to the output end of the jack through a tension and compression sensor.

[0005] The above-mentioned strap tension test device also includes a precision digital instrument, which is connected to the tension and compression sensor.

[0006] In the above-mentioned hoop tension test device, the jack is installed on the top surface of the support plate, the output end of the jack is fixedly connected to the upper connecting plate, and the two ends of the upper connecting plate are respectively connected to an upper pull rod, the upper pull rod is parallel to the axis of the jack, and the lower end of the upper pull rod passes through the support plate and is connected to the lower connecting plate; a connecting screw is fixedly installed in the middle of the lower connecting plate, and the connecting screw is connected to the upper end of the connecting shaft of the earring through a tension and compression sensor.

[0007] In the above-mentioned band tension test device, an annular groove is provided on the side wall of the positioning sleeve.

[0008] A method for testing the tension of a strap using the above-mentioned strap tension testing device comprises the following steps: 1) Install the hoop tension test device, keeping the positioning sleeve and the snap ring in the uninstalled state; 2) The hoop ring is installed in the middle of the positioning sleeve, one end of the hoop is connected to a hanging eye of the earring through the hanging ear, and the other end of the hoop is connected to the other hanging eye of the earring; 3) Place the positioning sleeve with the hoop and earring installed on the two positioning blocks, install the two clamping rings on the two positioning blocks respectively, and press them tightly on the positioning sleeve; the upper end of the connecting shaft of the earring is connected to the lower end of the tension and compression sensor; 4) Start the jack and tighten the hoop; the tension on the hoop is transmitted to the precision digital instrument through the tension and compression sensor; when the tension value reaches the designed value, the jack will no longer increase the tension and maintain this tension for 1.5-3 minutes. If the tension value remains within the tolerance range, the hoop is qualified; 5) Remove the tension of the jack and remove the hoop straps. The tension test is completed.

[0009] In the above-mentioned band tension test method, in step 2), the band ring is installed in the annular groove on the side wall of the positioning sleeve.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The installation strap tension test device of the present invention has a simple and compact structure, low cost and convenient operation; it is convenient to perform tension tests on straps piece by piece in real time at the production site, thereby ensuring product quality and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a front view of the strap tension test device of the present invention.

[0012] Figure 2 It is a right side view of the strap tension test device of the present invention.

[0013] Figure 3 It is a three-dimensional diagram of the strap tension test device of the present invention.

[0014] Figure 4 It is a three-dimensional view of a positioning sleeve of a band tension test device of the present invention.

[0015] Figure 5 It is a three-dimensional view of the lifting ring of the strap tension test device of the present invention.

[0016] Figure 6 It is a three-dimensional diagram of the assembly of the strap positioning set in the strap tension test method of the present invention.

[0017] Figure 7 It is a stereoscopic view of a hoop pin used in the hoop tension test method of the present invention.

[0018] Figure 8 It is a stereoscopic view of the pull pin used in the band tension test method of the present invention.

[0019] Fig. 9 It is a stereoscopic diagram of the lifting lug used in the strap tension test method of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1-5 As shown, the hoop tension test device of the present invention includes an upper connecting plate 1, an upper pull rod 2, a support plate 3, a lower connecting plate 4, three lower pull rods 5 (the number of the lower pull rods 5 is not limited to three, and can be two or more than three), an earring 6, a lifting ear 7, a clamping ring 8, a positioning block 9, a base plate 10, a positioning sleeve 11, a hinge bolt 12, a pull screw 14, a hoop pin 15, a pull pin 16, a tension and compression sensor 17, a connecting screw 18, a jack 19, a lifting ring 20, a locking plate 21, a latch 22, a precision digital instrument 23 and a connecting block 24.

[0022] The lower pull rod 5 and the positioning block 9 are fixedly mounted on the bottom plate 10, and the lower pull rod 5 is arranged perpendicular to the bottom plate 10. The support plate 3 is installed at the upper end of the lower pull rod 5, and the support plate 3 is parallel to the bottom plate 10; the jack 19 is fixed on the support plate 3. The earring 6 includes a connecting shaft 24 and a lifting ring arranged at the lower end of the connecting shaft, and a mounting groove is arranged at the lower end of the connecting shaft 24. The lifting ring is a T-shaped structure, and the vertical beam of the lifting ring is placed in the mounting groove at the lower end of the connecting shaft 24, and is fixed by a locking plate 21 after being inserted and connected with a latch 22. A lifting ring hole 201 is respectively provided at both ends of the crossbeam of the lifting ring 20.

[0023] The jack 19 can be fixed on the bottom surface of the support plate 3, and the output end of the jack 19 is connected to the upper end of the connecting shaft of the earring through the tension and compression sensor. Or the jack 19 is installed on the top surface of the support plate 3, and the output end of the jack 19 is fixedly connected to the upper connecting plate 1, and the two ends of the upper connecting plate 1 are respectively connected to an upper pull rod 2, and the upper pull rod 2 is parallel to the axis of the jack 19, and the lower end of the upper pull rod 2 passes through the support plate 3 and is connected to the lower connecting plate 4. A connecting screw 18 is fixedly installed in the middle of the lower connecting plate 4, and the connecting screw 18 is connected to the upper end of the connecting shaft of the earring 6 through the tension and compression sensor 17. A precision digital instrument is connected to the tension and compression sensor to display the tension measured by the tension and compression sensor.

[0024] The side wall of the positioning sleeve 11 is provided with an annular groove 111. The positioning block 9 is a rectangular parallelepiped structure with a semicircular groove on the upper end surface. Two positioning blocks 9 are installed in parallel on the bottom plate 10, and the semicircular grooves of the two positioning blocks 9 are coaxially arranged. The positioning sleeve 11 is supported in the semicircular grooves of the two positioning blocks 9; a semicircular ring structure snap ring 8 is installed on the top of each positioning block 9, and the snap ring 8 positions the positioning sleeve 11 circumferentially.

[0025] The method for testing the tension of a band of the present invention comprises the following steps: 1) Install the strap tensile test device, keeping the positioning sleeve 11 and the retaining ring 8 in the uninstalled state.

[0026] 2) Place the band 13 into the shallow annular groove 111 of the positioning sleeve 11. One end of the band 13 is connected to a lifting eye hole of the earring 6 through the lifting ear 7 with two standard round pins 25. The other end of the band 13 is fixed with a band pin 15. The pull screw 14 passes through the through hole at the center of the band pin 15 and is threadedly connected to the pull pin 16. The pull pin 16 is placed in another lifting eye hole of the earring 6 (see the attached figure for details). Figure 6 ).

[0027] 3) Place the positioning sleeve 11 with the installed and connected hoop 13 and earring 6 on the two positioning blocks 9, and use the hinge bolts 12 and washers to install the two retaining rings 8 on the two positioning blocks 9 respectively, and press them tightly on the positioning sleeve 1.

[0028] 4) Start the jack 19 to tighten the hoop, and the tension on the hoop is transmitted to the precision digital instrument 23 through the tension and compression sensor 17. When the tension value reaches the designed value, the hydraulic jack will no longer increase the tension and maintain this tension for 1.5-3 minutes. If the tension value remains within the set tolerance, the hoop quality is qualified.

[0029] 5) Remove the tension of the hydraulic jack 19, remove the hoop, and the tension test is completed.

Claims

1. A band tension test device, characterized in that: It includes a bottom plate, a plurality of pull-down rods, a support plate, a positioning block, a positioning sleeve, a snap ring, an earring and a jack; the pull-down rod and the positioning block are fixedly mounted on the bottom plate, and the pull-down rod is arranged perpendicular to the bottom plate; the support plate is mounted at the upper end of the pull-down rod, and the support plate is parallel to the bottom plate; the jack is fixed on the support plate; The positioning block is a rectangular structure with a semicircular groove on the upper end surface. The two positioning blocks are installed in parallel on the base plate, and the semicircular grooves of the two positioning blocks are coaxially arranged; the positioning sleeve is supported in the semicircular grooves of the two positioning blocks; a semicircular ring structured snap ring is installed on the top of each positioning block, and the snap ring positions the positioning sleeve circumferentially; the earring includes a connecting shaft and a lifting ring arranged at the lower end of the connecting shaft, the lifting ring is provided with two lifting ring holes, and the two lifting ring holes are respectively used to connect the two ends of the hoop; the upper end of the connecting shaft is connected to the output end of the jack through a tension and compression sensor.

2. The strap tensile test device according to claim 1, characterized in that: It also includes a precision digital meter, which is connected with the tension and compression sensor.

3. The strap tension test device according to claim 1, characterized in that: The jack is installed on the top surface of the support plate, the output end of the jack is fixedly connected to the upper connecting plate, the two ends of the upper connecting plate are respectively connected to an upper pull rod, the upper pull rod is parallel to the axis of the jack, and the lower end of the upper pull rod passes through the support plate and is connected to the lower connecting plate; a connecting screw is fixedly installed in the middle of the lower connecting plate, and the connecting screw is connected to the upper end of the connecting shaft of the earring through a tension and compression sensor.

4. The strap tensile test device according to claim 1, characterized in that: An annular groove is arranged on the side wall of the positioning sleeve.

5. A method for testing the tension of a strap using the strap tension testing device according to any one of claims 1 to 4, comprising the following steps: 1) Install the hoop tension test device, keeping the positioning sleeve and the snap ring in the uninstalled state; 2) The hoop ring is installed in the middle of the positioning sleeve, one end of the hoop is connected to a hanging eye of the earring through the hanging ear, and the other end of the hoop is connected to another hanging eye of the earring; 3) Place the positioning sleeve with the hoop and earring installed on the two positioning blocks, install the two clamping rings on the two positioning blocks respectively, and press them tightly on the positioning sleeve; the upper end of the connecting shaft of the earring is connected to the lower end of the tension and compression sensor; 4) Start the jack and tighten the hoop; the tension on the hoop is transmitted to the precision digital instrument through the tension and compression sensor; when the tension value reaches the designed value, the jack will no longer increase the tension and maintain this tension for 1.5-3 minutes. If the tension value remains within the tolerance range, the hoop is qualified; 5) Remove the tension of the jack and remove the hoop straps. The tension test is completed.

6. The method for testing the tension of a hoop according to claim 5, wherein in step 2), the hoop ring is installed in an annular groove on the side wall of the positioning sleeve.

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