CN204269479U - A constant temperature uniaxial tensile loading device for a universal material testing machine - Google Patents

Abstract

The utility model relates to a kind of constant temperature uniaxial drawing loading of universal testing machine, comprises upper and lower two groups of unitized constructions, often organizes unitized construction and includes pull bar, web joint, test specimen plate and bolt.Pull bar one end is equipped with screw thread, the other end is connected with the hinged disk connector of the upper and lower crossbeam of universal testing machine respectively, pull bar is fixedly connected with by threaded engagement with web joint, and being provided with pull-rod nut in the part that pull bar stretches out web joint, the peripheral position on web joint is equipped with multiple through hole in order to erection bolt.Test specimen plate is equipped with corresponding screw and bolt is connected.Two groups of unitized construction corresponding settings up and down, are fixed test specimen bonding to be measured by epoxy resin between two test specimen plates.In actual test, by changing test specimen plate bonding in advance, test specimen can be completed and more change jobs.The utility model utilize the tensile loading device good stability of universal testing machine, structure simple, with low cost, change test specimen convenient.

Description

A constant temperature uniaxial tensile loading device for a universal material testing machine

technical field

The utility model relates to a loading device of a universal material testing machine, in particular to a constant temperature uniaxial tension loading device for asphalt mixture.

Background technique

In order to obtain the anti-cracking performance of asphalt pavement materials, it is usually necessary to carry out tensile failure tests of asphalt mixtures under low temperature conditions. The widely used universal material testing machine is mainly composed of loading system, strain and displacement measurement system and control system. In order to measure the mechanical properties of materials at a constant temperature, it is usually necessary to add a constant temperature system on the basis of the aforementioned system. The commonly used constant temperature system is a constant temperature environment box independent of the material universal testing machine, and the overall structure is often complex and inconvenient. Replace the test piece. Since the uniaxial tensile test can not only establish the stress-strain relationship of asphalt mixture, but also obtain the fracture energy-displacement curve of mode I cracking, most of the current research uses indirect tensile test to approximate the tensile test of asphalt mixture, but due to Only part of the area of the indirect tensile specimen is subjected to tensile stress, and the actual experimental results obtained deviate greatly from the real properties.

Contents of the invention

The technical problem to be solved by the utility model is to provide a loading device with simple structure, low cost, convenient replacement of specimens, suitable for indoor constant temperature test research, which can overcome the difficulty of stretching and loading asphalt mixture specimens in a constant temperature box.

The technical solution of the utility model for solving the above-mentioned technical problems is as follows: a constant-temperature uniaxial tensile loading device for a universal material testing machine, comprising an upper combined structure and a lower combined structure.

The upper combined structure includes an upper tie rod, an upper connecting plate and an upper specimen plate, and the upper end of the upper tie rod is connected with the joint of the hinged plate of the upper beam of the universal material testing machine to avoid eccentric stretching. The beam moves, and the two combined structures can move relative to each other in the vertical plane.

The lower end of the upper pull rod is connected to the upper connection plate, the upper test piece plate is arranged in parallel below the upper connection plate, and the upper test piece plate and the upper connection plate are detachably connected.

The lower composite structure includes a pull-down rod, a lower connecting plate and a lower specimen plate, and the lower end of the pull-down rod is connected to the hinged plate connector of the lower beam of the universal material testing machine to avoid eccentric stretching. The beam moves, and the two combined structures can move relative to each other in the vertical plane.

The upper end of the pull rod is connected to the lower connection plate, the lower test piece plate is arranged in parallel above the lower connection plate, and the lower test piece plate and the lower connection plate are detachably connected.

The upper test piece plate is located directly above the lower test piece plate, the bottom surface of the upper test piece plate is opposite to the top surface of the lower test piece plate, and the test piece is fixed on the upper test piece plate and the lower test piece plate. between.

Preferably, the middle part of the upper connection plate is provided with a threaded through hole, the lower end of the upper tie rod is provided with external threads, and the lower end of the upper tie rod is fixedly connected with the upper connection plate through external threads and threaded through holes, And a pull-up rod nut is threadedly connected to the part of the lower end of the pull-up rod protruding from the threaded through hole.

Preferably, the peripheral positions of the upper connecting plate and the upper specimen plate are provided with multiple sets of upper and lower corresponding upper through holes, and each set of upper and lower corresponding upper through holes are threaded from top to bottom through upper bolts, In addition, upper nuts detachably connected to the upper bolts are respectively provided on the upper and lower sides of the upper test piece plate.

Preferably, the upper connecting plate and the upper test piece plate are both rectangular plates, and the four corners of the upper connecting plate are respectively detachably connected with the four corners of the upper test piece plate.

Preferably, the middle part of the lower connecting plate is provided with a threaded through hole, the upper end of the lower link is provided with external threads, and the upper end of the lower link is fixedly connected with the lower connecting plate through external threads and threaded through holes, And the part of the upper end of the lower rod protruding from the threaded through hole is threadedly connected with a lower rod nut.

Preferably, the peripheral positions of the lower connecting plate and the lower test piece plate are provided with multiple sets of lower through holes corresponding to the upper and lower sides, and each set of upper through holes corresponding to the upper and lower sides is threaded from bottom to top through lower bolts, and Lower nuts detachably connected to the lower bolts are respectively provided on the upper and lower sides of the lower test piece plate.

Preferably, the lower connecting plate and the lower test piece plate are both rectangular plates, and the four corners of the lower connecting plate are respectively detachably connected to the four corners of the lower test piece plate.

Preferably, the upper end of the test piece is bonded and fixed to the bottom surface of the upper test piece plate by epoxy resin, and the lower end of the test piece is also bonded to the top surface of the lower test piece plate by epoxy resin. The knot is fixed. In the actual test, for multiple pre-bonded specimens, the replacement of specimens can be completed only by replacing the specimen board.

Based on the above-mentioned technical scheme, the beneficial effects of the utility model are: the present invention utilizes the tensile loading device of the universal material testing machine, and after the upper and lower pull rods respectively extend into the thermostat from the upper and lower holes of the thermostat, the parts to be tested will be fixed. The test piece plate is connected with the connecting plate, so that the test piece can be loaded in the constant temperature environment provided by the incubator. The whole device has good stability, simple structure, low cost and convenient replacement of test pieces.

Description of drawings

Fig. 1 is the front view of the upper combined structure of the utility model;

Fig. 2 is the perspective view of the upper combined structure of the utility model;

Fig. 3 is the front view of the lower assembly structure of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Upper rod, 2. Upper rod nut, 3. Upper bolt, 4. Upper connecting plate, 5. Upper specimen plate, 6. Upper nut, 11. Lower rod, 12. Lower rod nut, 13. Lower bolt, 14. Lower connecting plate, 15. Lower test piece plate, 16. Lower nut.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

As shown in Figures 1-3, a constant temperature uniaxial tensile loading device of a universal material testing machine includes an upper combined structure and a lower combined structure.

The upper composite structure includes an upper tie rod 1, an upper connecting plate 4 and an upper specimen plate 5, and the upper end of the upper tie rod 1 is connected with the hinged disc joint of the upper beam of the universal material testing machine to avoid eccentric stretching. The beam of the universal testing machine moves, and the two combined structures can move relative to each other in the vertical plane.

The lower end of the upper tie rod 1 is connected to the upper connecting plate 4, the upper test piece plate 5 is arranged below the upper connecting plate 4 in parallel, and the upper test piece plate 5 and the upper connecting plate 4 Detachable connection.

Described lower composite structure comprises pull-down rod 11, lower connecting plate 14 and lower specimen plate 15, and the lower end of described pull-down rod 11 is connected with the hinged disk connector of the lower beam of universal material testing machine, to avoid eccentric stretching, by The beam of the universal testing machine moves, and the two combined structures can move relative to each other in the vertical plane.

The upper end of the pull-down rod 11 is connected to the lower connecting plate 14, the lower test piece plate 15 is arranged in parallel above the lower connecting plate 14, and the lower test piece plate 15 and the lower connecting plate 14 Detachable connection.

The upper test piece plate 5 is positioned directly above the lower test piece plate 15, the bottom surface of the upper test piece plate 5 is set opposite to the top surface of the lower test piece plate 15, and the test piece is fixed on the upper test piece plate 5 , Between the lower test piece board 15.

Preferably, the middle part of the upper connection plate 4 is provided with a threaded through hole, the lower end of the upper tie rod 1 is provided with an external thread, and the lower end of the upper tie rod 1 and the upper connection plate 4 are connected through the external thread and the threaded through hole. Cooperate and fixedly connected, and the upper tie rod nut 2 is threadedly connected to the part protruding from the threaded through hole at the lower end of the upper tie rod 1 .

Preferably, the peripheral positions of the upper connection plate 4 and the upper test piece plate 5 are provided with multiple sets of upper and lower corresponding upper through holes, and each set of upper and lower corresponding upper through holes passes through the upper bolt 3 from top to bottom. threaded connection, and upper nuts 6 detachably connected with the upper bolts 3 are respectively provided on the upper and lower sides of the upper test piece plate 5 . Preferably, the upper connecting plate 4 and the upper test piece plate 5 are both rectangular plates, and the four corners of the upper connecting plate 4 are detachably connected with the four corners of the upper test piece plate 5 respectively.

Preferably, the middle part of the lower connecting plate 14 is provided with a threaded through hole, and the upper end of the lower link 11 is provided with an external thread, and the upper end of the lower link 11 cooperates with the lower connecting plate through an external thread and a threaded through hole. It is fixedly connected, and the upper end of the lower rod 11 protrudes from the threaded through hole and is threaded with a lower rod nut 12 .

Preferably, the peripheral positions of the lower connecting plate 14 and the lower test piece plate 15 are provided with multiple groups of corresponding lower through holes, and each group of upper and lower corresponding upper through holes are threaded from bottom to top through the lower bolt 13. connected, and lower nuts 16 detachably connected to the lower bolts 13 are respectively provided on the upper and lower sides of the lower test piece plate 15.

Preferably, the lower connecting plate 14 and the lower test piece plate 15 are both rectangular plates, and the four corners of the lower connecting plate 14 are detachably connected with the four corners of the lower test piece plate 15 respectively.

Preferably, the upper end of the test piece is bonded and fixed to the bottom surface of the upper test piece plate 5 by epoxy resin, and the lower end of the test piece is also bonded to the top of the lower test piece plate 15 by epoxy resin. Surface adhesive fixed. In the actual test, for multiple pre-bonded specimens, the replacement of specimens can be completed only by replacing the specimen board.

When the universal material testing machine is used to measure the mechanical properties of materials at a certain constant temperature, first connect the upper and lower pull rods 1 and 11 to the upper and lower connectors of the universal material testing machine, and then connect the upper and lower pull rods 1 and 11 from the thermostat The upper and lower holes extend into the constant temperature box, and then the test piece plates 5 and 15 fixed to the test piece are respectively connected with the connecting plates 4 and 14, so that the test piece can be controlled in the constant temperature environment provided by the constant temperature box. load.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. A constant temperature uniaxial tensile loading device of a universal material testing machine, characterized in that: comprising an upper composite structure and a lower composite structure, The upper composite structure includes an upper tie rod, an upper connecting plate and an upper test piece plate, the upper end of the upper tie rod is connected with the joint of the hinged plate of the upper beam of the universal material testing machine, and the lower end of the upper tie rod is connected with the upper Plate connection, the upper test piece plate is arranged in parallel below the upper connecting plate, and the upper test piece plate and the upper connecting plate are detachably connected; The lower composite structure includes a pull-down rod, a lower connecting plate and a lower test piece plate, the lower end of the pull-down rod is connected to the joint of the lower beam of the universal material testing machine, and the upper end of the pull-down rod is connected to the lower plate connection, the lower test piece plate is arranged in parallel above the lower connecting plate, and the lower test piece plate and the lower connecting plate are detachably connected; The upper test piece plate is located directly above the lower test piece plate, the bottom surface of the upper test piece plate is opposite to the top surface of the lower test piece plate, and the test piece is fixed on the upper test piece plate and the lower test piece plate. between. 2. The constant temperature uniaxial tensile loading device of a universal material testing machine according to claim 1, wherein the middle part of the upper connecting plate is provided with a threaded through hole, and the lower end of the upper tie rod is provided with an outer Thread, the lower end of the upper tie rod and the upper connecting plate are fixedly connected through external threads and threaded through holes, and the part of the lower end of the upper tie rod protruding from the threaded through hole is threaded with an upper tie rod nut. 3. the constant temperature uniaxial tensile loading device of a kind of universal material testing machine according to claim 1, is characterized in that, the peripheral position of described upper connection plate and described upper test piece plate is all provided with multiple sets of upper and lower phases. Corresponding upper through holes, each group of upper and lower corresponding upper through holes are threaded from top to bottom through upper bolts, and the upper and lower sides of the upper test piece plate are respectively provided with detachable connection holes with the upper bolts. On the nut. 4. the constant temperature uniaxial tensile loading device of a kind of universal material testing machine according to claim 3, is characterized in that, described upper connecting plate and described upper specimen plate are rectangular plates, and described upper connecting plate The four corners are respectively detachably connected with the four corners of the upper test piece plate. 5. The constant temperature uniaxial tensile loading device of a universal material testing machine according to claim 1, wherein the middle part of the lower connecting plate is provided with a threaded through hole, and the upper end of the lower rod is provided with an outer The upper end of the lower rod is fixedly connected with the lower connecting plate through external threads and threaded through holes, and the part of the upper end of the lower rod protruding from the threaded through hole is threaded with a lower rod nut. 6. The constant temperature uniaxial tensile loading device of a universal material testing machine according to claim 1, characterized in that, the peripheral positions of the lower connecting plate and the lower test piece plate are all provided with multiple sets of upper and lower phases. Corresponding lower through holes, each set of upper and lower corresponding upper through holes are threaded from bottom to top through lower bolts, and the upper and lower sides of the lower test piece plate are respectively provided with lower bolts that are detachably connected with the lower bolts. nuts. 7. the constant temperature uniaxial tensile loading device of a kind of universal material testing machine according to claim 6, is characterized in that, described lower connecting plate and described lower test piece plate are rectangular plates, and described lower connecting plate The four corners are respectively detachably connected with the four corners of the lower test piece plate. 8. The constant temperature uniaxial tensile loading device of a universal material testing machine according to any one of claims 1-7, wherein the upper end of the test piece is connected to the upper test piece by epoxy resin The bottom surface of the plate is bonded and fixed, and the lower end of the test piece is also bonded and fixed with the top surface of the lower test piece plate through epoxy resin.