Electric hammer and hammering buffering structure thereof

Abstract

The utility model discloses an electric hammer and hammering buffer structure, when machine starts load work, the vice hammer top reaches the vice hammer seat, and the force that will be transmitted from the front end pickaxe or drill bit is transmitted to the locking ring through the pin, and then is transmitted to the rubber ring and is absorbed, when machine switches from load to no load, the hammer that has the impact force hits the vice hammer seat, and the force is transmitted to the locking ring through the pin, and then is transmitted to the rubber ring and is absorbed. The structure moves the rubber ring for buffering from the inside of the air cylinder to the outside of the air cylinder, under the same impact power, the space of the outer ring of the air cylinder can save the length space in the axial direction.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric equipment, and in particular relates to an electric hammer and its hammering buffer structure. Background Technology

[0002] Electric hammers and electric hammer drills are generally known as impact tools. With the impact during the machine's operation, while pursuing high hammering power, we must also take into account the user's feel and the machine's lifespan.

[0003] It is well known that a common solution to achieve high hammering power while also considering user comfort and machine lifespan is to utilize flexible components, such as springs and rubber rings. In traditional structural designs, adding flexible components increases the axial space. Impacts occur in both directions during hammering (reverse impact) and when the machine leaves the working plane (forward impact). To balance these two directions, the axial length of the machine is increased exponentially. This increased length also increases the weight of the machine, reducing user comfort and raising costs. Utility Model Content

[0004] The purpose of this invention is to provide an electric hammer and its hammering buffer structure, which can take into account both the buffering in the front and rear directions and the control of the machine length.

[0005] To solve the above problems, the technical solution of this utility model is as follows: A hammer impact buffer structure for transmitting rotation and / or impact to a machining head in an electric hammer or electric hammer drill, comprising: cylinder; The secondary hammer is reciprocally mounted inside the cylinder; The hammer abuts against the secondary hammer and can reciprocate within the cylinder to impact the secondary hammer; A secondary hammer seat is fitted onto the end of the secondary hammer that connects to the impact hammer; A locking ring is fitted around the outer periphery of the secondary hammer seat; The first elastic buffer and the second elastic buffer are axially spaced on the outer periphery of the cylinder and respectively abut against the two ends of the locking ring. A connector passes through the wall of the cylinder and connects the secondary hammer seat to the locking ring, such that when the secondary hammer is subjected to the impact force of the front load and moves backward, the secondary hammer seat drives the locking ring through the connector to compress the second elastic buffer to absorb the backward impact force. And when the hammer strikes the secondary hammer seat and moves it forward, the secondary hammer seat drives the locking ring through the connector to compress the first elastic buffer to absorb the forward impact force.

[0006] According to one embodiment of the present invention, the cylinder is provided with a shoulder on its outer periphery for axially limiting the first elastic buffer and the second elastic buffer.

[0007] According to one embodiment of the present invention, gaskets are provided on both sides of the first elastic buffer and the second elastic buffer to axially limit the first elastic buffer and the second elastic buffer.

[0008] According to one embodiment of the present invention, the first elastic buffer and the second elastic buffer are rubber rings.

[0009] According to one embodiment of the present invention, the connecting member is a pin, and the wall of the cylinder is provided with a wide hole extending axially. The connecting member passes through the wide hole and can move axially within the wide hole.

[0010] According to one embodiment of the present invention, the locking ring is clearance-fitted with the outer circumference of the cylinder to allow the locking ring to move axially.

[0011] According to one embodiment of the present invention, a sealing element is fitted onto the end of the auxiliary hammer away from the impact hammer to prevent dust from entering the cylinder.

[0012] An electric hammer includes the hammering buffer structure described in one embodiment of the present invention.

[0013] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art: In one embodiment of this utility model, the hammer impact buffer structure, when the machine begins to operate under load, has the secondary hammer hitting the secondary hammer seat. The force transmitted from the front pick or drill bit is transferred to the locking ring via a pin, and then absorbed by the rubber ring. When the machine switches from load to no load, the impacting hammer strikes the secondary hammer seat, transmitting the force to the locking ring via a pin, and then absorbed by the rubber ring. This structure moves the buffer rubber ring from the inside of the cylinder to the outside of the cylinder. Under the same impact power, utilizing the space of the outer ring of the cylinder saves axial length space. Both bidirectional impacts are absorbed by the elastic element. The peak value of the reverse impact transmitted to the operator's hand when the machine is unloaded or operating without load is reduced by more than 30%, reducing "rebound" and "nodding" phenomena, and significantly reducing fatigue during long-term operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a hammer impact buffer structure in one embodiment of the present invention; Figure 2 This is an exploded view of the hammer impact buffer structure in one embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1: Secondary hammer; 2-1: First elastic buffer; 2-2: Second elastic buffer; 3: Secondary hammer seat; 4: Impact hammer; 5: Cylinder; 51: Shoulder; 52: Wide hole; 6: Shim; 7: Sheath; 8: Locking ring; 9: Connector; 10: Tool sheath. Detailed Implementation

[0016] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of an electric hammer and its hammering buffer structure according to this utility model. The advantages and features of this utility model will become clearer from the following description and claims.

[0017] Please refer to Figure 1 and Figure 2 This embodiment provides a hammer impact buffer structure for an electric hammer or electric hammer drill that transmits rotation and / or impact to the machining head, comprising: Cylinder 5; The secondary hammer 1 is reciprocatingly mounted inside the cylinder 5; The hammer 4 abuts against the auxiliary hammer 1 and can reciprocate within the cylinder 5 to impact the auxiliary hammer 1; The secondary hammer seat 3 is sleeved on the end where the secondary hammer 1 connects to the hammer 4; Locking ring 8 is sleeved on the outer periphery of secondary hammer seat 3; The first elastic buffer 2-1 and the second elastic buffer 2-2 are axially spaced around the outer periphery of the cylinder 5 and respectively abut against the two ends of the locking ring 8. The connector 9 passes through the wall of the cylinder 5 and connects the secondary hammer seat 3 to the locking ring 8, so that when the secondary hammer 1 is subjected to the impact force of the front load and moves backward, the secondary hammer seat 3 drives the locking ring 8 through the connector 9 to compress the second elastic buffer 2-2 to absorb the backward impact force. And when the hammer 4 impacts the secondary hammer seat 3 and moves it forward, the secondary hammer seat 3 drives the locking ring 8 through the connector 9 to compress the first elastic buffer 2-1 to absorb the forward impact force.

[0018] This hammer impact buffer structure uses a "locking ring + external cylinder double elastic component" to transmit the impact forces generated during machine operation in both the "backward (load backlash)" and "forward (hammer dry strike)" directions to the first and second elastic buffer components respectively through the same locking ring. This avoids rigid impacts, significantly reduces fatigue stress in key components such as cylinders, gears, and housings, and extends the overall machine life.

[0019] Furthermore, the two sets of springs / rubber rings that traditionally need to be placed inside the cylinder are moved to the outer periphery of the cylinder, directly utilizing the previously unused radial space; at the same time, the cylinder outer wall shoulder is used for limiting, eliminating the need for additional retaining rings, bushings, and other parts. Compared with the traditional structure of the same specifications, the axial dimension can be shortened by about 15% to 25%, allowing the electric hammer / electric hammer drill to maintain a short body under high hammering energy, making it easy to operate in narrow working conditions.

[0020] Specifically, the cylinder 5 has a shoulder 51 on its outer periphery for axially limiting the first elastic buffer 2-1 and the second elastic buffer 2-2.

[0021] Furthermore, gaskets 6 are provided on both sides of the first elastic buffer 2-1 and the second elastic buffer 2-2 to further limit the axial movement of the first elastic buffer 2-1 and the second elastic buffer 2-2. Figure 1 As can be seen, pads 6 are provided on both sides of the first elastic buffer 2-1, and pads 6 are also provided on both sides of the second elastic buffer 2-2.

[0022] The first elastic buffer 2-1 and the second elastic buffer 2-2 mentioned above can be rubber rings or springs, depending on the actual situation.

[0023] The elastic buffer is located on the outer periphery of the cylinder and can be quickly disassembled and replaced after wear without disassembling the internal cylinder mechanism; the cylinder outer wall shoulder is integrally formed, which can avoid stress concentration and casting defects caused by inner wall slotting, resulting in better batch consistency and higher reliability.

[0024] In this embodiment, the secondary hammer base 3 is a hollow cylinder with multiple through holes on its circumference; correspondingly, the locking ring 8 also has multiple through holes on its circumference, positioned opposite to the through holes on the secondary hammer base 3 for easy connection. The number of through holes is not limited and can be determined according to actual needs.

[0025] In this embodiment, the connecting member 9 can be a pin. The wall of the cylinder 5 has a wide hole 52 extending axially. The connecting member 9 passes through the wide hole 52 and can move axially within the wide hole. The width of the wide hole 52 needs to be slightly larger than the width of the connecting member 9 so that when the machine is working, it can move left and right to drive the locking ring 8 to compress the elastic buffer and absorb the impact force. The connecting member 9 can also be a screw or bolt, and the corresponding through holes on the auxiliary hammer seat 3 and the locking ring 8 are screw holes.

[0026] Furthermore, a protective sleeve 7 is provided on the outer sleeve of the connector 9 to prevent the connector 9 from falling off.

[0027] Similarly, the locking ring 8 is fitted with the outer circumference of the cylinder 5 with a clearance to allow the locking ring 8 to move axially, thereby compressing the elastic buffer and absorbing the impact force.

[0028] Furthermore, a seal is fitted onto the end of the secondary hammer 1 furthest from the impact hammer 4 to prevent dust from entering the cylinder 5. A tool sleeve 10 is fitted onto the inner side of the cylinder 5 at the front end of the secondary hammer 1.

[0029] Based on the hammer impact buffer structure, an electric hammer can be made that takes into account both front and rear buffering and machine length control.

[0030] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A hammer impact buffer structure for transmitting rotation and / or impact to a machining head in an electric hammer or electric hammer drill, characterized in that, include: cylinder; The secondary hammer is reciprocally mounted inside the cylinder; The hammer abuts against the secondary hammer and can reciprocate within the cylinder to impact the secondary hammer; A secondary hammer seat is fitted onto the end of the secondary hammer that connects to the impact hammer; A locking ring is fitted around the outer periphery of the secondary hammer seat; The first elastic buffer and the second elastic buffer are axially spaced on the outer periphery of the cylinder and respectively abut against the two ends of the locking ring. A connector passes through the wall of the cylinder and connects the secondary hammer seat to the locking ring, such that when the secondary hammer is subjected to the impact force of the front load and moves backward, the secondary hammer seat drives the locking ring through the connector to compress the second elastic buffer to absorb the backward impact force. And when the hammer strikes the secondary hammer seat and moves it forward, the secondary hammer seat drives the locking ring through the connector to compress the first elastic buffer to absorb the forward impact force.

2. The hammer impact buffer structure as described in claim 1, characterized in that, The cylinder has a shoulder on its outer periphery for axially limiting the first elastic buffer and the second elastic buffer.

3. The hammer impact buffer structure as described in claim 1, characterized in that, The first elastic buffer and the second elastic buffer are provided with pads on both sides for axially limiting the first elastic buffer and the second elastic buffer.

4. The hammer impact buffer structure as described in any one of claims 1-3, characterized in that, The first elastic buffer and the second elastic buffer are rubber rings.

5. The hammer impact buffer structure as described in any one of claims 1-3, characterized in that, The connector is a pin, and the cylinder wall has a wide hole extending axially. The connector passes through the wide hole and can move axially within the wide hole.

6. The hammer impact buffer structure as described in any one of claims 1-3, characterized in that, The locking ring is clearance-fitted with the outer circumference of the cylinder to allow the locking ring to move axially.

7. The hammer impact buffer structure as described in any one of claims 1-3, characterized in that, A sealing element is fitted onto the end of the auxiliary hammer furthest from the impact hammer to prevent dust from entering the cylinder.

8. An electric hammer, characterized in that, Includes the hammer impact buffer structure as described in any one of claims 1-7.

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