CN110630725B

CN110630725B - Gear box and battering ram

Info

Publication number: CN110630725B
Application number: CN201910920823.9A
Authority: CN
Inventors: 胡宏; 王一锦
Original assignee: Masalta Engineering Hefei Co ltd
Current assignee: Masalta Engineering Hefei Co ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-12-08
Anticipated expiration: 2039-09-27
Also published as: CN110630725A

Abstract

The invention relates to a gear box and a battering ram, wherein the gear box comprises a crank gear and a tamping mechanism positioned below the crank gear, the output part of the crank gear is connected with the tamping mechanism through a crank connecting rod, the crank gear is meshed with a transmission gear, the transmission gear is positioned between the crank gear and the tamping mechanism, the transmission gear is arranged on a transmission shaft, the shaft body of the transmission shaft and the crank connecting rod are arranged in an intersecting manner and are mutually avoided, the shaft bodies of the transmission shaft extending to the two outer sides of the crank connecting rod are respectively arranged on an a mounting part and a b mounting part, and the transmission shaft is connected with a power. According to the invention, the two ends of the transmission shaft are respectively supported by the mounting part a and the mounting part b, so that the supporting rigidity is improved, and the service life of the transmission gear is prolonged.

Description

Gear box and battering ram

Technical Field

The invention relates to the technical field of battering rams, in particular to a gear box and a battering ram.

Background

The impact rammer is a compacting machine for compacting backfill by layers under the action of impact and impact vibration, and is generally divided into an electric impact rammer, a fuel oil impact rammer, a vibration impact rammer and the like. The battering ram mainly comprises an engine and a gear box connected with the engine, and as for the traditional gear box, a transmission gear and a crank gear of the battering ram are both arranged on a shell, so that the service life of the transmission gear is short.

Disclosure of Invention

The invention aims to provide a gear box, which supports two ends of a transmission shaft through an a mounting part and a b mounting part respectively, improves the support rigidity and prolongs the service life of a transmission gear.

Another object of the present invention is to provide a battering ram which is compact in overall structure and has increased stability.

The technical scheme adopted by the invention is as follows.

A gear box comprises a crank gear and a tamping mechanism located below the crank gear, wherein an output portion of the crank gear is connected with the tamping mechanism through a crank connecting rod, the crank gear is meshed with a transmission gear, the transmission gear is located between the crank gear and the tamping mechanism, the transmission gear is installed on a transmission shaft, a shaft body of the transmission shaft and the crank connecting rod are arranged in an intersecting mode and are avoided mutually, the shaft body of the transmission shaft extending to the two outer sides of the crank connecting rod is installed on an a installation portion and a b installation portion respectively, and the transmission shaft is connected with a power source.

Preferably, the gear box further comprises a housing and a box cover, the a mounting part is located on the housing, the b mounting part is located on the box cover, the power source is mounted on the housing, and the crank gear is mounted on the box cover through a gear shaft.

Preferably, the transmission shaft comprises a forward section a and a backward section b, the diameter of the section a is smaller than that of the section b, and the section a and the crank connecting rod are arranged in an intersecting manner and mutually avoid each other.

Preferably, the section b is connected with a power source.

Preferably, the central connecting line of the two ends of the crank connecting rod is provided with an avoidance area.

Preferably, the crank connecting rod has an annular hollow portion in the middle, and the annular hollow portion forms the avoidance region.

Preferably, the crank connecting rod is symmetrical about a central connecting line of both ends thereof.

Preferably, the crank gear and the transmission gear are positioned between the crank connecting rod and the box cover.

Preferably, the box cover comprises a cover body, wherein a b mounting part and a c mounting part which are convex relative to the cover body are arranged on the inner side of the cover body, and the b mounting part and the c mounting part are respectively used for mounting the transmission shaft and the gear shaft.

Preferably, the cover body is provided with an annular rib on the inner side thereof, and the b and c mounting portions are located inside the annular rib.

Preferably, radial ribs are provided between the b-attachment portion and the annular rib.

Preferably, radial ribs are provided between the c-mounting portion and the annular rib.

Preferably, the b and c mounting parts are cylindrical, a b mounting hole for mounting the transmission shaft is formed in the b mounting part, and a c mounting hole for mounting the gear shaft is formed in the c mounting part.

Preferably, the inner side of the shell is provided with an a mounting hole, and the a mounting hole is the a mounting part.

The impact rammer comprises an engine, a tamping mechanism and the gear box, wherein the engine is in power connection with the gear box

The gear box has the technical effects that: the mounting part a and the mounting part b are used for supporting two ends of the transmission shaft respectively, so that the supporting rigidity is improved, and the service life of the transmission gear is prolonged; and because the shaft body of transmission shaft and the crossing form of crank connecting rod are arranged and are dodged each other for overall structure is more compact, is favorable to reducing the focus, improves holistic stability.

The battering ram of the invention has the following technical effects: the engine is connected with the gear box through the transmission shaft, and the shaft body of the transmission shaft and the crank connecting rod are arranged in an intersecting manner and are avoided mutually, so that the engine is closer to the lower end of the gear box, the gravity center is reduced, and the overall stability is improved.

Drawings

FIG. 1 is a perspective view of a gearbox according to the present invention;

FIG. 2 is a front view of the gearbox of the present invention;

FIG. 3 is a front cross-sectional view of the gearbox of the present invention;

FIG. 4 is a right side view of the crank link of the present invention;

FIG. 5 is a right side view of the cover of the present invention;

FIG. 6 is a perspective view of an air filter for a battering ram engine according to the present invention;

FIG. 7 is a bottom view of an air filter for a battering ram engine according to the present invention;

FIG. 8 is a left side view of an air filter for a battering ram engine according to the present invention;

FIG. 9 is a cross-sectional view taken at A-A of FIG. 8;

FIG. 10 is a front view of the battering ram linkage of the present invention;

FIG. 11 is a front view of the battering ram of the present invention.

The corresponding relation of all the reference numbers is as follows: 100-gear box, 110-crank gear, 120-crank connecting rod, 121-avoiding area, 130-transmission gear, 140-shell, 150-box cover, 151-cover body, 152-b mounting part, 153-c mounting part, 154-annular reinforcing rib, 155-radial reinforcing rib, 200-air filter, 210-air filter body, 211-air outlet, 212-a chamber, 213-b chamber, 214-interlayer cavity, 215-annular bulge, 220-primary filtering part, 221-flow guide part, 222-a channel, 223-b channel, 224-ash outlet through hole, 230-base, 240-secondary filtering part, 241-primary filtering part, 242-secondary filtering part, 250-positioning part, 260-sealing part, 300-battering ram linkage, 310-handle, 320-extinguisher trigger assembly, 321-extinguisher switch, 322-press, 330-state feedback assembly, 331-a contact, 332-b contact, 340-mount.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention will now be described in detail with reference to the following examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

The impact rammer mainly comprises an air filter, an engine, a handle, a gear box, a tamping mechanism and a handrail, wherein the gear box, the air filter and the handle are respectively improved, and other components on the impact rammer are all implemented by the existing impact rammer if no special description is provided. The structure of the battering ram is shown in fig. 11, and the improvement scheme is as follows:

example 1

As shown in fig. 1 to 5, a gearbox 100 includes a crank gear 110 and a tamping mechanism located below the crank gear 110, an output portion of the crank gear 110 is connected with the tamping mechanism through a crank connecting rod 120, the crank gear 110 is engaged with a transmission gear 130, the transmission gear 130 is located between the crank gear 110 and the tamping mechanism, the transmission gear 130 is installed on a transmission shaft, a shaft body of the transmission shaft and the crank connecting rod 120 are arranged in an intersecting manner and are mutually avoided, shaft bodies of the transmission shaft extending to two outer sides of the crank connecting rod 120 are respectively installed on an a installation portion and a b installation portion, and the transmission shaft is connected with a power source. Here, the prior art of the tamping mechanism is mature, taking the tamping mechanism of the HCD 110-type impact rammer as an example, the spring sleeve is rigidly connected with the ramming plate, the spring sleeve and the ramming plate are connected with the piston and the piston rod at the lower end of the crank connecting rod 120 through a spring link, and the impact rammer is jumped by continuously compressing and extending the spring, so as to realize reciprocating impact on the paving material.

In the embodiment, the two ends of the transmission shaft are respectively supported by the mounting part a and the mounting part b, so that the supporting rigidity is improved, and the service life of the transmission gear 130 is prolonged; in addition, the shaft body of the transmission shaft and the crank connecting rod 120 are arranged in an intersecting manner and are mutually avoided, so that the whole structure is more compact, the center of gravity is reduced, and the whole stability is improved.

In order to optimize the stress performance of the gearbox, in the embodiment, the gearbox further comprises a shell 140 and a box cover 150, wherein a mounting part is positioned on the shell 140, and b mounting part is positioned on the box cover 150, and the force is dispersed to the shell 140 and the box cover 150 through a transmission shaft; the power source is mounted on the housing 140; the crank gear 110 is mounted on the cover 150 through a gear shaft, and transmits force to the cover 150 through the gear shaft.

For the traditional gearbox, the crank gear 110 and the transmission gear 130 are both arranged on the shell 140, and the stress of the gearbox is concentrated on the shell 140, namely the traditional gearbox is uneven in stress and short in service life; in this embodiment, the stress on the gear box is distributed to the housing 140 and the case cover 150, which is advantageous for improving the stress performance of the gear box.

In the present embodiment, the crank gear 110 and the transmission gear 130 are located between the crank link 120 and the cover 150.

The implementation of the box cover 150 is as follows: the cover 150 includes a cover body 151, and a b-mounting portion 152 and a c-mounting portion 153 protruding from the cover body 151 are disposed inside the cover body 151, and the b-mounting portion 152 and the c-mounting portion 153 are respectively used for mounting a transmission shaft and a gear shaft.

In order to reinforce the strength of the case cover 150, in the present embodiment, the cover main body 151 is provided with an annular bead 154 on the inside thereof, and the b-attaching portion 152 and the c-attaching portion 153 are positioned inside the annular bead 154. In addition, the radial ribs 155 are provided between the b-attachment portion 152 and the annular rib 154, and between the c-attachment portion 153 and the annular rib 154, thereby further enhancing the strength of the case cover 150.

In the present embodiment, the b-mounting portion 152 and the c-mounting portion 153 have a cylindrical shape, the b-mounting portion 152 is provided with a b-mounting hole for mounting the transmission shaft, and the c-mounting portion 153 is provided with a c-mounting hole for mounting the gear shaft. The inner side of the housing 140 is provided with an a-mounting hole, which is the a-mounting part. The transmission shaft is rotatably connected with the mounting hole a, the transmission shaft is rotatably connected with the mounting hole b, and the gear shaft is rotatably connected with the mounting hole c through a rotary bearing.

In the present embodiment, the transmission shaft includes a section a and a section b, the diameter of the section a is smaller than that of the section b, and the section a and the crank connecting rod 120 are arranged in an intersecting manner and are mutually avoided. Due to the smaller diameter of the section a, the section a is easier to escape from the crank link 120.

The transmission shaft needs to be connected to a power source, and in the present embodiment, the section b having a larger diameter is connected to the power source.

In order to make the overall structure more compact, in the present embodiment, the crank link 120 has an escape area 121 on the center line connecting both ends. The shaft body of the transmission shaft is located in the avoidance area 121, so that the transmission shaft and the crank connecting rod 120 are avoided from each other, and the transmission shaft and the crank connecting rod 120 are closer to each other.

The avoidance region 121 is implemented as follows: the crank link 120 has an annular recess in the middle, which forms the escape area 121.

The tamping mechanism receives a counter impact force and transmits the force to the crank link 120, and in order to uniformly apply the force to the crank link 120, the crank link 120 is symmetrical about a central connecting line of both ends thereof.

Here, an engine is used as a power source of the gear box, and the engine is axially connected to the drive shaft through a clutch.

As shown in fig. 6 to 9, in order to ensure that the engine sucks in clean air, the present embodiment further provides an air filter 200 for a battering ram engine, which includes an air filter body 210, the air filter body 210 is provided with an air inlet and an air outlet 211, the air inlet is connected with a primary filter part 220, the primary filter part 220 includes a flow guide part 221 arranged inside the air inlet, the flow guide part 221 is used for enabling air flow in the air inlet to make rotary motion, the air flow channel is communicated with the air inlet and the air outlet 211, the air flow channel includes an a channel 222 and a b channel 223, the a channel 222 is coextensive with the air inlet, the b channel 223 extends into the inside of the a1 end of the a channel 222, the a1 end is the end of the a channel 222, which is far away from the air inlet and is closed, the inner diameter of the b channel 223 is smaller than the inner diameter of the a1 end, and an annular groove for.

The working process of the embodiment is as follows: the air outlet 211 is communicated with an air suction port of the engine, so that external air can continuously enter from the air inlet; the airflow in the air inlet rotates through the flow guide part 221 to form cyclone, the cyclone impacts the annular groove and then returns back to enter the b channel 223, and in the process, impurities in the cyclone are gathered on the surface of the annular groove, so that primary filtration of the airflow is realized.

In this embodiment, the axis of the annular groove is horizontal, and the lower end of the outer side wall of the annular groove is provided with an ash through hole 224. The impurities collected on the surface of the annular groove slide down to the lower end of the annular groove and flow out through the ash through-holes 224.

In this embodiment, the b-channel 223 is coaxial with the a-channel 222.

The flow guide 221 is implemented as follows: the airflow guiding member 221 is a fan blade, the fan blade is installed on the base 230, and the base 230 is detachably installed inside the air inlet. Here, the base 230 is provided with a latch, and a sidewall of the air inlet is provided with a catch for the latch to be latched.

The air filter body 210 may have a square shape.

In order to improve the filtering efficiency, in the present embodiment, a cavity is provided on the air filter body 210, a secondary filter part 240 is installed inside the cavity, the secondary filter part 240 includes a filter element for filtering the air flow, the filter element divides the cavity into at least an a cavity 212 and a b cavity 213, an interlayer cavity 214 is provided on a sidewall of the cavity, the primary filter part 220 is provided on the sidewall, the a cavity 212 is communicated with the b channel 223 through the interlayer cavity 214, and the b cavity 213 is communicated with the air outlet 211.

The airflow after primary filtration enters the cavity and is filtered again through the filter element, so that the filtration efficiency is improved. More importantly, as the interlayer cavity 214 is arranged on the side wall of the chamber, the primary filter part 220 is arranged on the side wall, and the chamber a 212 is communicated with the channel b 223 through the interlayer cavity 214, the integral structure is compact, and the miniaturization development of the integral structure is facilitated.

On this basis, the filter member includes a first-stage filter member 241 horizontally arranged, and the first-stage filter member 241 divides the chamber in the vertical direction to form an upper chamber and a lower chamber, and the upper chamber forms the a-chamber 212. The first stage filter 241 may be a paper filter.

Besides, the filter member further includes a second-stage filter member 242 in a cylindrical shape, the second-stage filter member 242 is disposed inside the lower chamber, the second-stage filter member 242 divides the lower chamber into an inner chamber and an outer chamber which are arranged inside and outside, and the inner chamber forms the b chamber 213. The second stage filter element 242 may be a foam filter element. During installation, the second stage filter member 242 may be installed within the lower chamber and the first stage filter member 241 may be stacked on the second stage filter member 242.

In order to achieve the positioning and installation of the second-stage filter element 242, here, a positioning element 250 is provided at the bottom of the lower chamber, and the positioning element 250 is in positioning fit with the second-stage filter element 242.

Specifically, the positioning member 250 may be a positioning bolt, and the second-stage filter member 242 includes a tubular filter element, and a pressing plate is connected to an upper end of the tubular filter element and connected to the positioning bolt. The lower surface of clamp plate is equipped with the screw hole, and positioning bolt installs in the screw hole.

In order to ensure the filtering effect, in the present embodiment, the bottom of the lower chamber is provided with an annular protrusion 215, the annular protrusion 215 corresponds to the lower end of the tubular filter element, and a sealing member 260 is provided between the tubular filter element and the annular protrusion 215. The sealing member 260 may be a rubber packing.

For maintenance, an openable end cap is provided at the top of the a-chamber 212. Here, the end cap may be coupled with the air cleaner body 210 by bolts.

In the present embodiment, a plurality of primary filter portions 220 are arranged in parallel. Specifically, the primary filter portions 220 are arranged horizontally in a row on the sidewall of the chamber.

As shown in fig. 10, in order to better control the engine, the present embodiment further provides a battering ram linkage 300, which includes a handle 310 hinged on a mounting seat 340, a rotation path of the handle 310 includes a path a, the handle 310 is coupled with a throttle adjusting device in a path a rotation state to adjust a throttle opening, the rotation path of the handle 310 further includes a path b following the path a, a flameout trigger assembly 320 is disposed on the path b, and in a path b rotation state of the handle 310, the flameout trigger assembly 320 is turned on to stop the engine.

The throttle adjusting device of the traditional battering ram comprises a gear connected with one end of a handle 310, the gear is driven to rotate through rotation of the handle 310, the gear and a rack are in meshed transmission, a steel wire cable connected with the rack is moved, the opening degree of a throttle valve is adjusted through the steel wire cable, the size of air inflow is changed, and the rotating speed of an engine is controlled. In the present embodiment, the a-path is a path that the handle 310 of the conventional impact ram rotates by adjusting the opening degree of the throttle. The embodiment keeps the original throttle opening degree adjusting mode and improves the original throttle opening degree adjusting mode on the basis, namely, a flameout trigger assembly 320 is arranged on a path b along the path a, and a handle 310 rotates on the path b to conduct the flameout trigger assembly 320, so that the engine stops running; linkage between the throttle adjusting device and the flameout trigger assembly 320 is realized, and operation is facilitated. The original mode is kept for adjusting the opening of the throttle valve, so that the misoperation of the handle 310 by workers can be avoided.

In this embodiment, the extinguisher trigger assembly 320 includes an extinguisher switch 321 and a pressing member 322, and either one of the extinguisher switch 321 and the pressing member 322 is connected to the handle 310, and the other is connected to the mounting base 340. The flameout switch 321 is electrically connected with the spark plug through a high-voltage coil; in the process of rotating the handle 310, relative movement is generated between the flameout switch 321 and the pressing piece 322, two working states are provided between the pressing piece 322 and the flameout switch 321, one of the two working states is that when the pressing piece 322 presses the flameout switch 321, the flameout switch 321 is conducted and releases the energy of a spark plug, so that the engine stops running; secondly, when the pressing piece 322 is separated from the ignition switch 321, the ignition switch 321 is turned off.

Since the ignition switch 321 needs to be connected to a line, in order to prevent the line from moving, in the present embodiment, the ignition switch 321 is fixedly installed on the installation base 340, and the pressing member 322 is fixedly installed on the handle 310. The lower end of the handle 310 is provided with a pressing member 322.

In order to facilitate the working state of the impact rammer to be known to the operator, in the present embodiment, a state feedback assembly 330 is further disposed on the path of rotation of the handle 310 for feeding back the working state of the impact rammer.

In this embodiment, the status feedback assembly 330 includes an a-contact 331 connected to the handle 310, the a-contact 331 and a b-contact 332 cooperating, and the b-contact 332 connected to the mounting base 340. During the rotation of the handle 310, a pressing force with a pressure value varying between the a-contact piece 331 and the b-contact piece 332 is generated, and the resistance applied to the manual rotation of the handle 310 by the worker varies, so that the worker knows the working state of the impact rammer.

In order to ensure normal rotation of the handle 310, at least one of the a-contact 331 and the b-contact 332 is elastically stretchable, and thus, in the present embodiment, at least one of the a-contact 331 and the b-contact 332 has elasticity.

In order to feed back the idling operation state of the battering ram, in the present embodiment, the a-contact element 331 has a positioning end, the b-contact element 332 has a positioning groove, the handle 310 is rotated to the intersection of the a-path and the b-path, and the positioning end enters the positioning groove; the handle 310 leaves the intersection of the a-path and the b-path, and the positioning end leaves the positioning groove.

When the a-contact piece 331 has elasticity, the positioning end will vibrate during entering the positioning groove, so that the operator can obviously perceive that the battering ram is in an idle working state. Specifically, the positioning end is slidably connected to the mounting seat 340, and a compression spring is installed between the positioning end and the mounting seat 340. When the positioning end enters the positioning groove, the compression spring releases energy, so that the positioning end impacts the surface of the positioning groove, the handle 310 generates vibration, and a worker can obviously perceive that the battering ram is in an idle working state. The a-contact 331 can be a pin, a through hole for the pin to pass through is provided on the mounting seat 340, the upper end of the a-contact 331 is a positioning end, one end of a compression spring abuts against the positioning end, and the other end of the compression spring abuts against the mounting seat 340.

In order to facilitate the positioning end to enter and leave the positioning groove during the rotation of the handle 310, in the present embodiment, the positioning end surface has an a-arc transition portion, and the positioning groove surface has a b-arc transition portion matched with the a-arc transition portion in shape.

In order to make the entire battering ram linkage more compact, the pressing piece 322 is connected to the handle 310 via a b-contact piece 332 in the present exemplary embodiment.

Specifically, the b-contact member 332 is a cam, which is sleeved outside the lower end of the handle 310, and the b-contact member 332 is connected with the handle 310 through a pin.

In order to reliably press the ignition switch 321, the pressing piece 322 has a triangular shape, and the pressing piece 322 is in surface contact with the ignition switch 321 in a state where the pressing piece 322 presses the ignition switch 321.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims

1. A kind of battering ram, including engine and tamping mechanism, characterized by, including gear box and empty filter (200) used for battering ram engine, the gear box includes crank gear (110) and tamping mechanism located below it, the output part of the crank gear (110) is connected with tamping mechanism through the crank connecting rod (120), the crank gear (110) is engaged with drive gear (130), characterized by, the drive gear (130) is located between crank gear (110) and tamping mechanism, the drive gear (130) is installed on drive shaft, the shaft body of the drive shaft and crank connecting rod (120) are disposed and dodged each other crosswise, the shaft body that the drive shaft extends to two outsides of crank connecting rod (120) is installed on a, b installation department respectively, the drive shaft is connected with engine; the air filter (200) comprises an air filter body (210), an air inlet and an air outlet (211) are formed in the air filter body (210), the air inlet is connected with a primary filter part (220), the primary filter part (220) comprises a flow guide piece (221) arranged inside the air inlet, the flow guide piece (221) is used for enabling air flow in the air inlet to rotate, an air flow channel is communicated with the air inlet and the air outlet (211), the air flow channel comprises a channel (222) and a channel (223), the channel (222) is arranged in the air inlet in a smooth mode, the channel (223) extends into the end a1 of the channel (222), the end a1 is the end, far away from the air inlet, of the channel (222) and is closed, the inner diameter of the channel (223) is smaller than that of the end a1, and an annular groove for trapping impurities is formed between the end a1 of the channel (222) and the; the axis of the annular groove is horizontal, and the lower end of the outer side wall of the annular groove is provided with a dust outlet through hole (224); be equipped with the cavity on air cleaner body (210), cavity internally mounted has secondary filter (240), secondary filter (240) are including the filter piece that is used for filtering the air current, filter and cut apart the cavity at least and form a cavity (212) and b cavity (213), be equipped with on the cavity lateral wall and press from both sides layer chamber (214), primary filter (220) are located on this lateral wall, a cavity (212) are through pressing from both sides layer chamber (214) and b passageway (223) intercommunication, b cavity (213) and gas outlet (211) intercommunication.

2. The battering ram of claim 1, wherein: the gear box further comprises a shell (140) and a box cover (150), wherein an a mounting part is positioned on the shell (140), a b mounting part (152) is positioned on the box cover (150), a power source is mounted on the shell (140), and a crank gear (110) is mounted on the box cover (1501) through a gear shaft.

3. The battering ram of claim 1 or 2, wherein: the transmission shaft comprises a section a and a section b which are arranged along the same direction, the diameter of the section a is smaller than that of the section b, and the section a and the crank connecting rod (120) are arranged in an intersecting manner and are mutually avoided.

4. The battering ram of claim 3, wherein: the section b is connected with a power source.

5. The battering ram of claim 1 or 2, wherein: an avoidance area (121) is arranged on the central connecting line of the two ends of the crank connecting rod (120).

6. The battering ram of claim 5, wherein: the middle part of the crank connecting rod (120) is provided with an annular hollow part, and the annular hollow part forms the avoiding area (121).

7. The battering ram of claim 5, wherein: the crank connecting rod (120) is in a symmetrical structure about a central connecting line of two ends of the crank connecting rod.

8. The battering ram of claim 2, wherein: the crank gear (110) and the transmission gear (130) are positioned between the crank connecting rod (120) and the box cover (150).

9. The battering ram of claim 2, wherein: the box cover (150) comprises a cover body (151), wherein b and c installation parts which are convex relative to the cover body (151) are arranged on the inner side of the cover body (151), and the b and c installation parts are used for installing a transmission shaft and a gear shaft respectively.

10. The battering ram of claim 9, wherein: the inner side of the cover body (151) is provided with an annular reinforcing rib (1541), and the b and c mounting parts are positioned inside the annular reinforcing rib (154); a radial reinforcing rib (155) is arranged between the b mounting part (152) and the annular reinforcing rib (154); a radial rib (155) is arranged between the c mounting part (153) and the annular rib (154); b. the c mounting part is cylindrical, a b mounting hole for mounting the transmission shaft is formed in the b mounting part (152), and a c mounting hole for mounting the gear shaft is formed in the c mounting part (153); the inner side of the shell (140) is provided with an a mounting hole which is the a mounting part.