CN113670550A

CN113670550A - Hammer test apparatus and method of performing impact test using the same

Info

Publication number: CN113670550A
Application number: CN202010410300.2A
Authority: CN
Inventors: 范俊; 赵海会
Original assignee: Vitesco Automotive Wuhu Co Ltd
Current assignee: Vitesco Automotive Wuhu Co Ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-11-19

Abstract

The invention provides a hammer test apparatus for a fuel pump, comprising: a working bench; the fixing clamp is arranged on the working rack and used for fixing the fuel pump to be detected; the bracket assembly comprises vertical beams and cross beams; the pendulum assembly comprises a swing arm which is connected to the cross beam in a swinging mode, a hammer body fixed to the free end of the swing arm, and a protective cover, wherein the protective cover is provided with a cover body which is arranged on the workbench frame around the fixing clamp, the top of the cover body is opened to form an opening for the fuel pump to be detected to enter and exit, and a first through groove for the pendulum assembly to swing and penetrate into the protective cover is formed; the vertical beam is installed to move along a first horizontal direction perpendicular to the cross beam relative to the working rack, the cross beam is connected to move along a vertical direction relative to the vertical beam, and the swing arm is connected to move along a second horizontal direction parallel to the cross beam, so that the hammer body is adjusted to impact the central position of a pump body of the fuel pump. The invention also provides a method for performing an impact test on the fuel pump by using the hammering test equipment.

Description

Hammer test apparatus and method of performing impact test using the same

Technical Field

The invention relates to the technical field of hammering test equipment, in particular to hammering test equipment for a fuel pump and a method for performing a collision test on the fuel pump by using the hammering test equipment.

Background

Fuel pumps are an important component of fuel supply systems for motor vehicles. In order to ensure the safety of the fuel pump, the fuel pump is assembled on a collision test device for the fuel pump to carry out a collision test, and after the collision test, the flange of the fuel pump is required to be free from leakage.

However, in the prior art, the equipment used for the collision test is complex, the test process is also complex, a special tool is needed, the test cost is expensive, and the test period is long.

Disclosure of Invention

In order to overcome the problems, the invention aims to provide a hammer test device which can simulate the actual collision working condition by hammering a pump body of a fuel pump through a hammer and can quickly and simply verify the collision performance of a flange of the fuel pump.

To this end, the present invention provides a hammer test apparatus for a fuel pump, the hammer test apparatus comprising: a working bench; the fuel pump to be detected is arranged on the working bench; a bracket assembly including a vertical beam mounted to the work bench and a cross beam connected to the vertical beam; the pendulum assembly comprises a swing arm which is connected to the cross beam in a swinging mode, a hammer body which is fixed to the free end of the swing arm, and a protective cover, wherein the protective cover is provided with a cover body which is arranged on the workbench frame around the fixing clamp, the top of the cover body is opened to form an opening for the fuel pump to be detected to enter and exit, and the cover body is further provided with a first through groove for the pendulum assembly to swing and penetrate into the protective cover; the vertical beam is arranged to move relative to the workbench frame in a first horizontal direction perpendicular to the cross beam, the cross beam is connected to move relative to the vertical beam in a vertical direction, and the swing arm is connected to move relative to the cross beam in a second horizontal direction parallel to the cross beam, so that the hammer body can be adjusted to impact the central position of a pump body of the fuel pump.

Through providing this kind of hammering test equipment, can carry out collision test to the pump body of fuel pump to simulate actual collision operating mode. The test equipment is simple, is purely mechanical equipment, and has lower equipment cost and maintenance cost.

According to one aspect of the invention, the vertical beam can be coupled to the work bench, for example, by means of a first ball screw device, so that a horizontal movement adjustment of the vertical beam, i.e. the carriage assembly, relative to the work bench can be achieved. The cross beam can be coupled to the vertical beam, for example, by means of a second ball screw arrangement, so that an up-and-down adjustment of the cross beam along the vertical beam can be achieved in order to adjust the height position of the hammer block. Also, the swing arm can be coupled to the cross-beam, for example, by a slider and nut, thereby enabling horizontal position adjustment of the pendulum assembly. However, it should be understood that other suitable coupling devices may be used in place of the ball screw or the slider-nut assembly, so long as positional adjustment of the vertical, cross or swing beams is achieved and remains fixed in place after adjustment.

In one aspect of the present invention, the cover body includes a front plate, a back plate, two side plates, and a top plate pivotally connected to the two side plates for covering the opening, wherein the front plate has the first through slot opened therein, the top plate has a second through slot opened therein, and the first through slot and the second through slot together form a passage for the pendulum assembly to enter the cover body. Alternatively, the top plate may be pivotally connected to the front or back plate, and is also contemplated within the scope of the present application.

In one aspect, the bottom of the hood, e.g. the bottom of both side panels, may be provided with rollers and the vertical beam is further fixedly connected to the back panel, so that the horizontal beam and the hood are moved together when the vertical beam is moved in the first horizontal direction. The arrangement is such that the position of the cover relative to the mounting fixture can be adjusted, in particular such that the first and second through slots are aligned with the mounting fixture.

In an aspect of the present invention, the hammer test apparatus may further include a cushion pad disposed inside the back plate and opposite to the fixing jig. The cushion pad is made of rubber, for example. After the hammer body impacts the pump body of the fuel pump, the pump body can be basically crushed, the impacted hammer body still has larger kinetic energy, and the rubber buffer cushion can play a role in absorbing the kinetic energy.

In order to prevent the hammer from rebounding against the crashed pump body, the hammer test apparatus may further include a one-way stopper mechanism installed inside the two side plates, the one-way stopper mechanism being configured such that the swinging hammer assembly can strike the rubber bumper pad beyond the one-way stopper mechanism, but cannot reversely pass the one-way stopper mechanism upon returning, but stops between the one-way stopper mechanism and the rubber bumper pad.

In one aspect of the present invention, the fixing jig may include an end cap for fixing a flange of the fuel pump, and an angle of the end cap may be adjustable so that the fixing jig may fix the fuel pump having the inclined flange.

In one aspect, the hammer test apparatus may further comprise a retaining device by which the pendulum assembly is releasably retained in a position in which the swing arm is substantially parallel to the cross-member to facilitate installation of the next oil pump to be tested.

The invention also provides a method for performing a collision test on a fuel pump by using the hammering test equipment, wherein the fuel pump comprises a pump body, a flange with a guide post and a guide rod inserted into the guide post, and the method comprises the following steps:

placing the fuel pump to be detected on a fixing clamp, and fixing the flange downwards on the fixing clamp;

moving the swing arm relative to the cross beam such that the swing arm is in a vertical position when the ram is about to impact the pump body;

moving the cross beam in a vertical direction relative to the vertical beam to adjust the vertical height of the hammer body, so that the hammer body is positioned at the vertical center position of the pump body;

horizontally moving the vertical beam relative to the working rack to adjust the horizontal position of the hammer body, so that the hammer body is positioned at the transverse central position of the pump body;

pulling a pendulum assembly to a position where its swing arm is parallel to the cross beam, and then allowing the pendulum assembly to freely fall and impact a central location of the pump body, wherein upon impact the ram applies a force to the pump body that breaks the guide post; and

after the guide post is broken, a sealing test is performed on the flange to check whether the flange has cracks.

In one aspect of the invention, the pendulum assembly may be releasably retained by a retaining device in a position in which the pendulum arm is substantially parallel to the cross member to facilitate removal of an impacted fuel pump.

In the above method, the hammer body is configured to be capable of applying an impact force of 40G to 90G, for example, 88G, to the pump body when the hammer body strikes the pump body. Through applying the impact force of above-mentioned scope to the pump body, the pump body receives the impact, drives the guide bar and receives the striking, because flange this body is fixed by mounting fixture for the atress position is located guide post department, thereby the striking makes the guide post emergence fracture of flange. In the event of a guide post fracture, the flange is subjected to a sealing test to verify whether it has a crack. If the flange has no cracks, the quality of the flange is qualified, and if the flange has cracks, the quality of the flange is unqualified.

Drawings

Preferred embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic structural view of a hammer test apparatus according to one embodiment of the present invention;

FIG. 2 is another schematic structural view of the hammer test apparatus shown in FIG. 1;

FIG. 3 is a schematic view of the internal structure of the hammer test apparatus shown in FIG. 1 with the top and front panels of the protective cover removed for clarity;

FIG. 4 is a schematic block diagram of one embodiment of a fuel pump under test of the present invention; and

fig. 5 schematically shows a positional relationship when the hammer block is about to strike the pump body.

Detailed Description

A hammer test apparatus implemented according to the present invention will be described below by way of example with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments.

Fig. 1 and 2 show schematic structural views of a hammer test apparatus 1 according to an embodiment of the present invention. The hammer test device 1 is mainly used for detecting the impact performance of a fuel pump, in particular a flange of the fuel pump. As shown, the hammer test apparatus 1 includes a work bench 2, a fixing jig 3 (see fig. 3) mounted on the work bench, a bracket assembly 4 for carrying a pendulum assembly 5, and a shield 6 for preventing damage to surrounding facilities or personnel from debris generated by an impact. The carriage assembly 4 comprises a vertical beam 41 and a cross beam 42 connected to the vertical beam, in this embodiment the vertical beam 41 may be coupled to the work bench 2, for example by means of a first ball screw arrangement 11, so that the vertical beam 41 can be moved in a first horizontal direction relative to the work bench 2, if necessary, and thereby adjust the position of the carriage assembly 4 relative to the work bench 2. The cross beam 42 may be coupled to the vertical beam 41, for example, by means of a second ball screw device 12, so that the height of the cross beam 42, and thus the pendulum 52, can be adjusted along the vertical beam 41. It will be appreciated that the ball screw arrangement may be replaced by other suitable coupling arrangements as long as the position of the cross beam or vertical beam relative to the work bench 2 can be adjusted as necessary and still remain fixed in position after adjustment. The pendulum assembly 5 comprises a swing arm 51 which is swingably connected to the cross beam 42 and a hammer block 52 which is fixed to the free end of the swing arm, for example the hammer block 52 may be coupled to the swing arm 51 by a nut, and the swing arm 51 may be coupled to said cross beam 42 by a slider and a nut, such that the swing arm 51 is movable relative to the cross beam 42 in a second horizontal direction perpendicular to the first horizontal direction, so as to be adjusted to be completely vertical when the hammer block impacts the oil pump. By moving the vertical beams, the cross beams, and the swing arms, the hammer block 52 can be adjusted so that it is exactly centered in the pump body of the fuel pump when it strikes the pump body (see fig. 5).

In this embodiment, the hood 6 may have a hood 60 disposed on the work bench 2 around the fixing jig 3, the hood 60 including a front plate 6a, a back plate 6b, and two side plates 6c, and the top of the hood being open to form an opening for the entry and exit of a fuel pump to be tested. Preferably, the shield 6 further includes a top plate 6d pivotally connected to the two side plates 6c for shielding the opening. As shown, the top plate 6d includes, for example, two portions each hingedly coupled to the adjacent side plate 6 c. A first through groove 62 is formed in the front plate 6a, a second through groove 63 is formed in the top plate 6d, and the first through groove and the second through groove jointly form a passage for the pendulum assembly 5 to enter the protective cover, so that the pendulum body can impact on a pump body to be detected when falling freely.

In the above embodiment, see in particular fig. 2, the bottom of the cover 60, i.e. the bottom of the two side plates 6c, may be provided with rollers 7, and the vertical beam 41 is also fixedly connected to the back plate 6b, so that the cross beam and the cover move together when the vertical beam 41 moves in this first horizontal direction. In this way, the position of the vertical beam, and thus the cover 60, can be adjusted to align the first and second through

slots

62, 63 with the fixture without aligning the first and second through

slots

62, 63 with the fixture.

Fig. 3 is a schematic view of the internal structure of the hammer test apparatus shown in fig. 1, with the top plate 6d and the front plate 6a of the protection cover removed for clarity. After the hammer body impacts the pump body of the fuel pump, the pump body is basically crushed, but the hammer assembly 5 still has large kinetic energy and cannot be automatically stopped. In order to prevent the hammer block 52 from hitting the back plate 6b, a rubber cushion 8 is provided on the inner side of the back plate opposite to the fixing jig 3 for absorbing the kinetic energy of the hammer block 52.

Preferably, hammer test apparatus 1 may further include a one-way stopper mechanism 9 mounted inside side plate 6c, configured such that oscillating pendulum assembly 5 can strike said rubber bumper 8 beyond the one-way stopper mechanism, but cannot reverse beyond the one-way stopper mechanism upon return, but stops between said one-way stopper mechanism 9 and rubber bumper 8. For example, the one-way limiting mechanism 9 is a limiting block respectively arranged on the two side plates, and the limiting block is designed in a one-way mode and cannot be opened reversely. When the hammer 52 hits the rubber bumper 8, since the kinetic energy may not be completely eliminated, the rebound occurs, in which case the hammer 52 finally stops between the one-way stopper mechanism 9 and the rubber bumper 8 due to the blocking action of the one-way stopper mechanism 9.

In the invention, the fixing clamp 3 may further include an end cap 31 for fixing the flange 10 of the fuel pump, and the angle of the end cap 31 may be arbitrarily adjusted, so that the fixing clamp 3 can clamp the fuel pump with the oblique flange.

After the fuel pump test is completed, to facilitate removal of the impacted fuel pump, a retainer 4a may be provided by which the pendulum assembly 5 may be releasably retained, for example, by the pendulum arm 51 in a position substantially parallel to the cross member 42.

The present invention also provides a method of performing a crash test on the fuel pump P using the above-described hammer test apparatus 1. As shown in fig. 4, the fuel pump P includes a pump body 13, a flange 10 having guide posts 10a, and guide rods 14 inserted into the guide posts.

In the present invention, in order to achieve the effect that the pendulum assembly 5, in a free-falling state, strikes the pump body of the fuel pump and breaks the guide post at a certain point, it is necessary that the pendulum strikes the pump body 13 at the lowest point of the swinging motion, and the impact force at that point can be in the range of 40G to 90G, and the impact force in this range is provided so as to ensure that the guide post 10a of the flange 10 breaks at the time of striking.

In one example, the size of the hammer block 52 may be designed to be 89mm 88mm 76mm, the weight of the hammer block may be 4.634kg, for example, and the total length of the swing arm 51 and the hammer block 52 is 1050 mm. The pendulum assembly thus configured, at the lowest point in the swinging motion, can provide an impact force of about 88G to the pump body.

The test method may comprise the steps of:

placing a fuel pump P to be detected on a fixing clamp 3, and fixing a flange 10 on the fixing clamp 3 downwards;

moving the swing arm 51 with respect to the cross beam 42 to adjust its position so that it is in a vertical position when the hammer block 52 is about to strike the pump body 13;

moving the cross beam 42 in the vertical direction with respect to the vertical beam 41 to adjust the vertical height of the hammer block 52 so that the hammer block is in the vertically central position of the pump body 13;

horizontally moving the vertical beam 41 with respect to the work bench 2 to adjust the horizontal position of the hammer block 52 so that the hammer block is in the laterally central position of the pump body 13;

pulling the pendulum assembly 5 with its swing arm 51 in a position parallel to the cross beam and then allowing it to fall freely to strike the central position of the pump body, wherein the hammer body exerts a force on the pump body 13 that can break the guide post 10 a; and

after the guide post 10a is broken, a sealing test is performed on the flange 10 to check whether the flange has cracks. If the flange does not have cracks, the quality of the flange is qualified and passes the detection; if the flange has cracks, the quality of the flange is unqualified and the flange fails the detection.

In one embodiment, the method further comprises the step of releasably retaining the pendulum assembly 5 in a position in which the oscillating arm 51 is substantially parallel to said cross-member 42, by means of retaining means 4a, after striking the pump body of the fuel pump. Thereby facilitating removal of a bumped fuel pump and testing of another fuel pump

In order to check the crash behavior of the flange of the fuel pump, it is necessary to proceed in four directions, namely the driving direction, the opposite direction to the driving direction and two directions transverse to the driving direction. If the test is carried out in the direction of travel, the fuel pump P to be tested is placed on the fixing clamp 3 in the direction of travel in the fuel pump clamping step, and the above-described method steps are carried out. When the detection is then carried out in the opposite direction to the driving direction, a new fuel pump needs to be replaced, and the above method steps are repeated. The method steps for detecting two directions transverse to the driving direction are the same, and are not described in detail here.

Industrial applicability

Compared with the prior art, the hammering test equipment provided by the invention can be used for performing a collision test on the pump body of the fuel pump so as to simulate the actual collision working condition. The test equipment is simple, is purely mechanical equipment, and has lower equipment cost and maintenance cost. .

Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various combinations, alterations and modifications within the spirit and scope of the invention will be apparent to those skilled in the art, and the scope of the invention should be determined by that defined in the appended claims.

Claims

1. A hammer test apparatus (1) for a fuel pump (P), comprising:

a work bench (2);

the fixing clamp (3) is arranged on the working table frame (2) and is used for fixedly placing a fuel pump (P) to be detected;

a bracket assembly (4) comprising a vertical beam (41) mounted to the work bench (2) and a cross beam (42) connected to the vertical beam;

a pendulum assembly (5) comprising a swing arm (51) swingably connected to the cross member (42) and a hammer block (52) fixed to a free end of the swing arm, and

the protective cover (6) is provided with a cover body (60) which surrounds the fixing clamp (3) and is arranged on the workbench frame (2), the top of the cover body is opened to form an opening (61) for the fuel pump to be detected to enter and exit, and the cover body is further provided with a first through groove (62) for the pendulum assembly (5) to swing and penetrate into the protective cover;

wherein the vertical beam (41) is mounted so as to be movable relative to the table frame (2) in a first horizontal direction perpendicular to the transverse beam (42), the transverse beam (42) is connected so as to be movable relative to the vertical beam (41) in a vertical direction, and the oscillating arm (51) is connected so as to be movable relative to the transverse beam (42) in a second horizontal direction parallel to the transverse beam (42), so that the hammer body can be adjusted so as to strike the central position of the pump body of the fuel pump.

2. Hammer test apparatus (1) according to claim 1, wherein the vertical beam (41) is coupled to the work bench (2) by a first ball screw device (11); the cross beam (42) is coupled to the vertical beam (41) by a second ball screw device (12); and the swing arm (51) is coupled to the cross beam (42) by a slider and a nut.

3. A hammer test apparatus (1) according to claim 1 or 2, wherein the housing (60) comprises a front plate (6a), a back plate (6b) and two side plates (6c), the shield further comprising a top plate (6d) pivotally connected to the two side plates for shielding the opening, wherein the front plate has the first through slot (62) cut therein, the top plate (6d) has a second through slot (63) cut therein, the first through slot and the second through slot together forming a passage for the pendulum assembly (5) to enter the shield.

4. A hammer test apparatus (1) according to claim 3, wherein the bottom of the hood (60) is provided with rollers (7) and the vertical beam (41) is further fixedly connected to the back plate (6b) so as to bring the cross beam and the hood together to move when the vertical beam (41) moves in the first horizontal direction.

5. A hammer test apparatus (1) according to claim 3, further comprising a rubber cushion (8) provided inside the back plate (6b) and opposite to the fixing jig (3).

6. A hammer test apparatus (1) according to claim 5, further comprising a one-way stop mechanism (9) mounted inside the side plate (6c) and configured such that a swinging pendulum assembly (5) can strike the rubber bumper (8) beyond the one-way stop mechanism but cannot reverse beyond the one-way stop mechanism upon return but stops between the one-way stop mechanism (9) and the rubber bumper (8).

7. A hammer test apparatus (1) according to claim 1 or 2, wherein the fixing clamp (3) comprises an end cap (31) for fixing a flange (10) of the fuel pump (P), and the angle of the end cap is adjustable.

8. A hammer test apparatus (1) according to claim 1 or 2, further comprising a retaining device (4a) by which the pendulum assembly (5) is releasably retained in a position in which the swing arm (51) is substantially parallel to the cross-member (42).

9. A method of performing a crash test on a fuel pump (P) including a pump body (13), a flange (10) having guide posts (10a), and guide rods (14) inserted into the guide posts, using the hammer test apparatus (1) according to any one of claims 1 to 8, the method comprising the steps of:

placing a fuel pump (P) to be detected on a fixing clamp (3), and fixing the flange (10) on the fixing clamp (3) downwards;

-moving the oscillating arm (51) with respect to the cross-beam (42) so that it is in a vertical position when the hammer block (52) is to strike said pump body (13);

moving the cross beam (42) in a vertical direction with respect to the vertical beam (41) to adjust the vertical height of the hammer block (52) such that the hammer block is in a vertically central position of the pump body (13);

horizontally moving the vertical beam (41) relative to the worktable (2) to adjust the horizontal position of the hammer block (52) so that the hammer block is in the transverse central position of the pump body (13);

pulling the pendulum assembly (5) to a position where its swing arm (51) is parallel to the cross beam and then allowing it to fall freely to impact the central position of the pump body, wherein the hammer body exerts an impact force on the pump body (13) that can break the guide post (10 a); and

after the guide post (10a) has been broken, the flange (10) is subjected to a sealing test to verify whether it has a crack.

10. The method of claim 9, further comprising the steps of:

after the striking step, the pendulum assembly (5) is releasably held in a position in which the swing arm (51) is substantially parallel to said cross-member (42) by a holding means (4 a).

11. The method of claim 9, wherein the ram (52) applies an impact force of 40-90G to the pump body when impacting the pump body.