CN205079997U - Secondary impact device prevents to drop hammer - Google Patents

Abstract

The utility model discloses a device for preventing the secondary impact of a drop hammer, which comprises a test bench and a drop hammer. A left positioning block and a right positioning block parallel to each other are arranged on the top of the test bench, and a left guide column is arranged on the top of the left positioning block. The top of the right 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, The top of the right positioning block is provided with a right crank slider mechanism, and the left and right crank slider mechanisms both include a first connecting rod and a second connecting rod, and the opposite positions of the left and right guide posts are provided with protruding grooves. , 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 act. The utility model can effectively prevent the falling hammer from hitting 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 utility model belongs to the technical field of drop hammer control of a roadway test system, in particular 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 dynamic load is realized by 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 drop height and lifting of drop hammer; automatic capture by 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, lacking for large-scale impact test anti-dropping weight test device.

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

Utility model content

In order to avoid the disadvantages of the above-mentioned prior art, the utility model provides a secondary impact prevention device for a large impact testing machine.

The technical scheme adopted in the utility model 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 utility model obtains is:

1. The utility model provides a device for preventing the secondary impact of the drop hammer on a large impact testing machine. When the drop hammer falls in the utility model, the pin shaft will be squeezed into the falling track of the drop hammer. When the drop hammer hits Behind the pressure 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. The first and second connecting rods are under the dual force of the pin shaft and the spring It moves and finally makes the second connecting rod protrude from the protruding groove to form a support for the falling weight when it falls for the second time, and prevents the falling weight from hitting the pressure-bearing column for the second time.

2. The utility model has the advantages of simple and compact structure, convenient operation and low production cost.

Description of drawings

Fig. 1 is the structural representation of the utility model.

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 utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the utility model 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 carry the pin shaft 8 to move up respectively, and the first and second connecting rods move under the dual force of the pin shaft 8 and the spring 9 and move up. 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 support 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 utility model can be realized by adopting or referring to the prior art.

In describing the present utility model, it should 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 utility model and simplifying the description, rather than indicating or implying Any device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model 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 utility model or go beyond the appended claims defined range.

Claims (8)

1. A device for preventing secondary impact of a drop hammer is characterized by comprising a test bed and the drop hammer, wherein a left positioning block and a right positioning block which are parallel to each other are arranged at the top end of the test bed; the left guide post and the right guide post are both hollow structures, a left slider-crank mechanism is arranged at the top end of the left positioning block, a right slider-crank mechanism is arranged at the top end of the right positioning block, the left slider-crank mechanism and the right slider-crank mechanism both comprise a first connecting rod and a second connecting rod, opposite positions of opposite inner sides of the left guide post and the right guide post are both provided with an extending groove, one end of the second connecting rod is a free end, the free end can enter and exit along the extending groove, 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 slider-crank mechanism is fixedly connected with the inner wall of the left guide post, and the other end of the first connecting rod of the right slider-crank mechanism is; the device for preventing secondary impact of the drop hammer further comprises a trigger mechanism for driving a first connecting rod and a second connecting rod in the left crank slider mechanism and the right crank slider mechanism to act.

2. The device of claim 1, wherein the triggering mechanism comprises a left triggering mechanism for triggering the left slider-crank mechanism and a right triggering mechanism for triggering the right slider-crank mechanism, the left and right triggering mechanisms each comprise a pin and a spring disposed at the hinge of the first link and the second link, the pin has an axis perpendicular to the plane of the top end of the left and right positioning blocks, one end of the spring of the left triggering mechanism is fixedly connected to the hinge of the first and second links, the other end is fixedly connected to the inner wall of the left guide post, one end of the spring of the right triggering mechanism is fixedly connected to the hinge of the first and second links, the other end is fixedly connected to the inner wall of the right guide post, the drop hammer bounces after falling on the pressure-bearing post, during the bounces, the left and right ends of the drop hammer respectively carry the pin to move upwards, the first and second links move under the dual forces of the pin and the spring and cause the second link to protrude from the protrusion slot, and the second connecting rod extending from the extending groove is used for supporting the falling hammer falling again.

3. The device for preventing the secondary impact of the drop hammer as claimed in claim 2, wherein the pin has a conical stopper fixed to the top end thereof, the stopper includes a tapered portion and a lifting portion fixed to each other, the lifting portion is fixed to the top end of the pin, and the tapered portion is located above the lifting portion.

4. A drop hammer secondary strike prevention device as claimed in claim 2, wherein the initial state of the spring is a tensioned state.

5. A secondary impact preventing device as claimed in any one of claims 2 to 4, wherein said left and right guide posts each comprise a front wall, a rear wall, a left wall and a right wall; the first connecting rod of the left triggering mechanism is fixedly connected with the inner side surface of the left wall of the left guide post, the spring of the left triggering mechanism is fixedly connected with the inner side surface of the front wall of the left guide post, and the extending groove on the left guide post is formed in the lower part of the right wall of the left guide post; the first connecting rod of the right trigger mechanism is fixedly connected with the inner side surface of the right wall of the right guide post, the spring of the right trigger mechanism is fixedly connected with the inner side surface of the rear wall of the right guide post, and the extending groove in the right guide post is formed in the lower portion of the left wall of the right guide post.

6. The device for preventing the secondary impact of the falling hammer as claimed in claim 5, wherein the rear wall of the left guide post and the front wall of the right guide post are both provided with a pin shaft placing groove, and a half of the pin shaft is placed in the pin shaft placing groove.

7. The device for preventing the secondary impact of the drop hammer as claimed in claim 1, wherein the test bed is provided with a hole groove, and the pressure-bearing column is placed in the hole groove.

8. A drop hammer secondary strike prevention device as claimed in claim 1, wherein the length of said second link is greater than the length of said first link.