CN105259022B - One kind prevents the secondary impact device that drops hammer - Google Patents

Abstract

The invention discloses a device for preventing the secondary impact of a falling hammer, which comprises a test bench and a falling hammer. The top of the test bench is provided with a left positioning block and a right positioning block parallel to each other. The top of the positioning block is provided with a right guide column, and the drop hammer can slide up and down along the left and right guide columns at the same time, and a pressure column is arranged between the left and right guide columns; the top of the left positioning block is provided with a left crank slider mechanism, and the right The top of the positioning block is provided with a right crank-slider mechanism, the left and right crank-slider mechanisms both include a first connecting rod and a second connecting rod, and the relative positions of the left and right guide columns are provided with protruding grooves at the opposite inner sides. One end of the second connecting rod can go in and out along the protruding groove, and the device also includes a trigger mechanism for driving the first and second connecting rods in the left and right slider crank mechanisms to move. The invention can effectively prevent the falling hammer from colliding with the pressure-bearing column again when it falls for the second time, and has simple structure and convenient operation.

Description

A device for preventing secondary impact of falling hammer

technical field

The invention belongs to the technical field of hammer drop control in roadway test systems, and in particular relates to a device for preventing secondary impact of a drop hammer.

Background technique

In the similar test of deep roadway excavation, dynamic load needs to be applied to the roof of the roadway. The realization of the dynamic load is through the impact of the falling weight. After the falling weight falls, it bounces and hits the upper part of the roadway again, which will affect the test results and affect one impact. Test the accuracy of the experimental results. At present, the research on anti-secondary impact at home and abroad mainly includes mechanical, pneumatic, electromagnetic, hydraulic and so on. Such as semi-automatic pneumatic clamping device, computer automatic control of falling height and lifting of falling hammer; automatic capture of electromagnet to prevent the sample from being impacted again. And most of the existing anti-dropping hammer secondary impact devices are aimed at the anti-secondary impact device on the small-sized impact testing machine, and lack the anti-dropping weight test device for large-scale impact tests.

This shows that the prior art needs to be further improved and improved.

Contents of the invention

In order to avoid the disadvantages of the above-mentioned prior art, the present invention provides a device for preventing secondary impact of a falling weight for a large impact testing machine.

The technical scheme adopted in the present invention is:

A device for preventing the secondary impact of a falling weight, comprising a test bench and a falling weight, the top of the test bench is provided with a left positioning block and a right positioning block parallel to each other, the top of the left positioning block is provided with a left guide column, and the top of the right positioning block is There is a right guide column, the left and right guide columns are parallel to each other, the drop hammer can slide up and down along the left and right guide columns at the same time, a pressure bearing column is arranged between the left and right guide columns, and the top surfaces of the left and right positioning blocks are higher than The top surface of the pressure-bearing column; the inside of the left and right guide columns are all hollow structures, the top of the left positioning block is provided with a left crank slider mechanism, the top of the right positioning block is provided with a right crank slider mechanism, and the left and right crank sliders The block mechanisms all include a first connecting rod and a second connecting rod, and the relative positions of the left and right guide columns facing the inner side are all provided with extending grooves, and one end of the second connecting rod is a free end and the free end can extend along the The slot goes in and out, the other end of the second connecting rod is hinged with one end of the first connecting rod, the other end of the first connecting rod of the left crank slider mechanism is fixedly connected with the inner wall of the left guide column, and the first connecting rod of the right crank slider mechanism The other end of the connecting rod is fixedly connected with the inner wall of the right guide column; the device for preventing the secondary impact of the falling weight also includes a trigger mechanism for driving the first and second connecting rods in the left and right slider crank mechanisms.

The trigger mechanism includes a left trigger mechanism for triggering the left slider crank mechanism and a right trigger mechanism for triggering the right slider crank mechanism. The pin shaft and spring at the hinge, the axis of the pin shaft is perpendicular to the plane where the top faces of the left and right positioning blocks are located, one end of the spring of the left trigger mechanism is fixedly connected with the hinge of the first and second connecting rods, and the other end is connected with the The inner wall of the left guide column is fixedly connected, one end of the spring of the right trigger mechanism is fixedly connected with the hinge of the first and second connecting rods, and the other end is fixedly connected with the inner wall of the right guide column. During the bouncing process, the left and right ends of the drop hammer respectively move up with the pin shaft, and the first and second connecting rods move under the dual force of the pin shaft and the spring, causing the second connecting rod to extend from the protruding groove. Out, the second connecting rod that stretches out from the stretching groove is used for supporting the drop hammer that falls again.

The top of the pin shaft is fixedly connected with a stopper, the stopper is conical, and the stopper includes a pointed cone part and a lifting part fixedly connected to each other, the lifting part is fixedly connected with the top of the pin shaft, and the pointed cone part is located above the lifting part .

The initial state of the spring is a tensioned state.

The left and right guide columns all include a front wall, a rear wall, a left wall and a right wall; wherein, the first connecting rod of the left trigger mechanism is fixedly connected with the inner surface of the left wall of the left guide column, and the spring of the left trigger mechanism is connected with the inner surface of the left wall of the left guide column. The inner surface of the front wall of the left guide column is fixedly connected, and the protruding groove on the left guide column is opened at the bottom of the right wall of the left guide column; the first connecting rod of the right trigger mechanism is fixed to the inner surface of the right wall of the right guide column. Even, the spring of the right trigger mechanism is fixedly connected with the inner surface of the rear wall of the right guide post, and the protruding groove on the right guide post is offered at the bottom of the left wall of the right guide post.

Both the rear wall of the left guide post and the front wall of the right guide post are provided with pin placement grooves, and half of the pin shaft is placed in the pin placement grooves.

Holes are provided on the test bench, and pressure-bearing columns are placed in the holes.

The length of the second connecting rod is greater than that of the first connecting rod.

Owing to adopting above-mentioned technical scheme, the beneficial effect that the present invention obtains is:

1. The present invention provides a device for preventing the secondary impact of the falling hammer on a large impact testing machine. When the falling hammer falls in the present invention, the pin shaft will be squeezed into the falling track of the falling hammer. When the falling hammer hits the bearing After the column, the drop hammer springs up and moves up with the pin shaft, and the tensioned spring will pull the hinge of the first and second connecting rods, and the first and second connecting rods will move under the dual force of the pin shaft and the spring and Finally, the second connecting rod is stretched out from the protruding groove to form a support for the falling weight when it falls for the second time, preventing the falling weight from hitting the pressure-bearing column for the second time.

2. The present invention has simple and compact structure, convenient operation and low production cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the connection relationship between the first connecting rod, the second connecting rod, the spring and the pin shaft in the present invention.

in,

1. Left guide column 2, drop weight 3, right guide column 4, right positioning block 5, test bench 6, left positioning block 7, pressure bearing column 8, pin shaft 9, spring 10, first connecting rod 11, second Connecting rod 12, block 13, protruding groove

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments.

As shown in Figures 1 and 2, a device for preventing the secondary impact of the falling weight includes a test bench 5 and a falling weight 2. The top of the test bench 5 is provided with a left positioning block 6 and a right positioning block 4 parallel to each other. The top of the block 6 is provided with a left guide column 1, and the top of the right positioning block 4 is provided with a right guide column 3, the left and right guide columns are parallel to each other, the drop hammer 2 can slide up and down along the left and right guide columns simultaneously, and the left and right guide A pressure-bearing column 7 is arranged between the columns, and a hole groove is opened on the test bench 5, and the pressure-bearing column 7 is placed in the hole groove, and the top surfaces of the left and right positioning blocks are higher than the top surfaces of the pressure-bearing column 7; The inside of the right guide column is a hollow structure, the top of the left positioning block 6 is provided with a left crank slider mechanism, the top of the right positioning block 4 is provided with a right crank slider mechanism, and the left and right crank slider mechanisms all include the first connecting block. Rod 10 and the second connecting rod 11, the length of the second connecting rod 11 is greater than the length of the first connecting rod 10, and the relative position of the inner side of the left and right guide columns is all provided with a protruding groove 13, the second connecting rod 11 One end is a free end and the free end can go in and out along the protruding groove 13, and the other end of the second connecting rod 11 is hinged with one end of the first connecting rod 10; A trigger mechanism for the action of the first and second connecting rods in the left and right slider crank mechanisms.

The trigger mechanism includes a left trigger mechanism for triggering the left slider crank mechanism and a right trigger mechanism for triggering the right slider crank mechanism. Pin 8 and spring 9 at the hinge of 11, the rear wall of the left guide post 1 and the front wall of the right guide post 3 are provided with a pin placement groove, and half of the pin shaft 8 is placed in the pin placement groove Inside, the axis of the pin shaft 8 is perpendicular to the plane where the top faces of the left and right positioning blocks are located, and the initial state of the spring 9 (that is, the state before the first drop of the hammer) is a tensioned state; the left and right guides The columns all include a front wall, a rear wall, a left wall and a right wall; wherein, the first connecting rod 10 of the left trigger mechanism is fixedly connected with the inner surface of the left wall of the left guide column 1, and the spring 9 of the left trigger mechanism is connected with the left guide column. The inner surface of the front wall of 1 is fixedly connected, and the protruding groove on the left guide column 1 is opened at the bottom of the right wall of the left guide column 1; The side is fixedly connected, the spring 9 of the right trigger mechanism is fixedly connected with the inner surface of the rear wall of the right guide column 3, and the protruding groove on the right guide column 3 is opened at the bottom of the left wall of the right guide column 3; After reaching the pressure-bearing column 7, it bounces up. During the bounce-up process, the left and right ends of the drop hammer 2 respectively carry the pin shaft 8 to move up, and the first and second connecting rods move under the dual force of the pin shaft 8 and the spring 9 and move upward. Cause the second connecting rod 11 to protrude from the protruding groove, and the second connecting rod 11 protruding from the protruding groove is used to hold the falling weight 2 that falls again, effectively preventing the falling weight 2 from being damaged by the pressure bearing column 7. Second hit.

In order to satisfy the requirement that the pin shaft 8 can be smoothly squeezed into the falling track of the drop weight 2 when the drop weight 2 falls and that the pin shaft 8 can be carried up smoothly when the drop weight 2 bounces up, a stopper 12 is fixed on the top of the pin shaft 8, The stopper 12 is conical, and the stopper 12 includes a pointed cone part and a lifting part fixedly connected to each other. The lifting part is fixedly connected with the top end of the pin shaft 8, and the pointed cone part is located above the lifting part, thereby satisfying the smooth falling of the drop hammer 2. With smooth lift pin 8 as required.

The parts not mentioned in the present invention can be realized by adopting or referring to the prior art.

In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (6)

1. A device for preventing the secondary impact of the falling weight, characterized in that it comprises a test stand and a falling weight, the top of the test stand is provided with a left positioning block and a right positioning block parallel to each other, and the top of the left positioning block is provided with a left guide column , the top of the right positioning block is provided with a right guide column, the left and right guide columns are parallel to each other, the drop hammer can slide up and down along the left and right guide columns at the same time, a pressure bearing column is arranged between the left and right guide columns, and the left and right positioning The top surface of the block is higher than the top surface of the pressure column; the inside of the left and right guide columns are hollow structures, the top of the left positioning block is provided with a left crank slider mechanism, and the top of the right positioning block is provided with a right crank slider mechanism , the left and right slider crank mechanisms both include a first connecting rod and a second connecting rod, the length of the second connecting rod is greater than the length of the first connecting rod, and the relative positions of the left and right guide posts facing the inner side are all set There is a protruding groove, one end of the second connecting rod is a free end and the free end can go in and out along the protruding groove, the other end of the second connecting rod is hinged with one end of the first connecting rod, the first of the left crank slider mechanism The other end of the connecting rod is fixedly connected with the inner wall of the left guide column, and the other end of the first connecting rod of the right crank slider mechanism is fixedly connected with the inner wall of the right guide column; The trigger mechanism for the first and second link actions in the left and right slider crank mechanisms, the trigger mechanism includes a left trigger mechanism for triggering the left slider crank mechanism and a right trigger mechanism for triggering the right slider crank mechanism mechanism, the left and right trigger mechanisms all include pins and springs arranged at the hinge of the first connecting rod and the second connecting rod, the axis of the pin shaft is perpendicular to the plane where the top faces of the left and right positioning blocks are located, the left trigger mechanism One end of the spring is fixedly connected with the hinge of the first and second connecting rods, the other end is fixedly connected with the inner wall of the left guide column, and one end of the spring of the right trigger mechanism is fixedly connected with the hinge of the first and second connecting rods, The other end is fixedly connected with the inner wall of the right guide column. When the drop hammer falls and hits the pressure-bearing column, it bounces up. During the bounce-up process, the left and right ends of the drop hammer carry the pin shaft and move upward respectively. The first and second connecting rods are on the pin. Move under the double acting force of axle and spring and cause the second connecting rod to stretch out from the stretching groove, the second connecting rod stretching out from the stretching groove is used for supporting the drop hammer that falls again. 2. A device for preventing the secondary impact of falling weights according to claim 1, wherein a stopper is fixedly connected to the top of the pin shaft, the stopper is in the shape of a cone, and the stoppers include pointed cones that are fixedly connected to each other part and the lifting part, the lifting part is fixedly connected with the top of the bearing pin, and the pointed cone part is located above the lifting part. 3 . The device for preventing secondary impact of a falling weight according to claim 1 , wherein the initial state of the spring is a tensioned state. 4 . 4. A secondary impact prevention device according to any one of claims 1 to 3, wherein the left and right guide posts each include a front wall, a rear wall, a left wall and a right wall ; Wherein, the first connecting rod of the left trigger mechanism is fixedly connected with the inner surface of the left wall of the left guide column, the spring of the left trigger mechanism is fixedly connected with the inner surface of the front wall of the left guide column, and the protruding groove on the left guide column Set at the bottom of the right wall of the left guide column; the first connecting rod of the right trigger mechanism is fixedly connected with the inner surface of the right wall of the right guide column, and the spring of the right trigger mechanism is fixedly connected with the inner surface of the rear wall of the right guide column. The protruding groove on the right guide post is opened at the bottom of the left wall of the right guide post. 5. A device for preventing the secondary impact of falling hammer according to claim 4, characterized in that, the rear wall of the left guide column and the front wall of the right guide column are provided with pin placement grooves, and the pin shafts Half of it is placed in the pin shaft placement groove. 6 . The device for preventing the secondary impact of the falling weight according to claim 1 , wherein a hole is opened on the test bench, and the pressure-bearing column is placed in the hole. 6 .