A marine engine piston life test device

Abstract

The application discloses a marine engine piston life test device in the technical field of marine engines, which comprises a base, a mounting rack arranged on the base, a test seat arranged on the base and a gas storage tank communicated with a test hole on the test seat. A heating sheet is arranged in the gas storage tank. A moving piece for moving up and down is slidably arranged on the mounting rack. A fixing piece is arranged at the bottom end of the moving piece. A rack is arranged on the side wall of the moving piece. A driving piece is arranged on the mounting rack. A missing tooth gear is arranged on the output shaft of the driving piece. A connecting block is arranged on the mounting rack. An elastic piece is arranged between the connecting block and the mounting rack. In the application, when the missing tooth gear is rotated to be not engaged with the rack, the elastic piece is elastically expanded to drive the moving piece, the fixing piece and the piston to move upwards. In the process that the piston moves to the outside of the test hole, the driving piece is not connected with the moving piece. The pressure in the test hole can be utilized, and the burden of the driving piece is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of marine engine technology, in particular to a marine engine piston life test device. BACKGROUND

[0002] The piston is an important component of the engine, in order to ensure the production quality of the piston, the produced piston needs to be sampled and tested; generally, the piston is inserted into a hole similar to the cylinder sleeve, and then the piston is reciprocated in the hole by using a driving mechanism to drive the piston to reciprocate in the hole for testing; however, the piston is reciprocated by the driving mechanism, and the temperature in the hole is increased to generate a certain pressure, and the pressure environment of the piston working needs to be simulated during the test, so the hole has a certain pressure, and the pressure in the hole will exert a pushing force to the outside of the piston during the movement of the piston to the outside of the hole. Since the conveying efficiency of the driving mechanism is generally constant, the speed of the piston movement is fixed, which causes the pressure in the hole to be unable to be utilized, resulting in waste of power, and the pressure directly acts on the output shaft of the driving mechanism, increasing the burden of the driving mechanism and easily causing damage to the driving mechanism, affecting the service life of the driving mechanism of the test device. SUMMARY

[0003] The present application aims to provide a marine engine piston life test device to solve the problem of waste of power caused by the pressure in the hole being unable to be utilized, and the pressure acting on the output shaft of the driving mechanism, increasing the burden of the driving mechanism and easily causing damage to the driving mechanism.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a marine engine piston life test device, comprising: a base and a mounting bracket arranged on the base, the test device further comprising: a test seat arranged on the base and a gas storage tank in communication with the test hole of the test seat;

[0005] The gas storage tank is provided with a heating sheet, and the mounting bracket is provided with a moving part for moving up and down, and the bottom end of the moving part is provided with a fixing part for fixing the test piston;

[0006] The side wall of the moving part is provided with a rack, the mounting bracket is provided with a driving part, the output shaft of the driving part is provided with a missing tooth gear engaged with the rack, the mounting bracket is provided with a connecting block, and the connecting block and the mounting bracket are provided with an elastic part.

[0007] As a preferred, the connecting block and the mounting bracket are provided with a telescopic part, and the mounting bracket is provided with a speed limiting mechanism attached to the moving end of the telescopic part.

[0008] As preferred, the speed limiting mechanism comprises a set mounted on a mounting frame, a contact piece attached to the side wall of the moving end of the telescopic piece and a spring piece connected to the contact piece are slidably arranged in the set, a mounting piece is mounted on the mounting frame, a push rod and a movable rod are slidably arranged on the mounting piece in the same direction as the contact piece, one end of the push rod is connected to the contact piece, a return spring is arranged between the movable rod and the mounting piece, a winding piece and a torsion spring connected to the winding piece are rotatably arranged on the mounting piece, a connecting rope is wound on the winding piece, two ends of the connecting rope are connected to the push rod and the movable rod respectively, and a protrusion for contacting the end of the movable rod is arranged on the side wall of the moving piece.

[0009] As preferred, the movable rod comprises a rod body and a guide block, the guide block is hingedly arranged below one end of the rod body facing the moving piece, an elastic element is arranged between the guide block and the rod body, and the side wall of the guide block facing the moving piece is inclined.

[0010] As preferred, a pressing plate for discharging air inside the gas storage tank and a supporting spring connected to the pressing plate are slidably arranged in the gas storage tank, a pressing piece is arranged in the gas storage tank on the moving path of the pressing plate, an alarm and a pressing block for pressing the switch of the alarm are arranged outside the gas storage tank, and a linkage rope is arranged between the pressing block and the pressing piece.

[0011] As preferred, a groove is arranged in the test hole of the test seat, a temperature sensor is arranged in the groove, the temperature sensor is electrically connected to a controller, and the controller is electrically connected to a heating sheet.

[0012] As preferred, a mounting sleeve is arranged on the gas storage tank, a limiting rod for limiting the reverse movement of the pressing plate and a spring connected to the limiting rod are slidably arranged in the mounting sleeve, a plurality of groups of slots are arranged on the side wall of the mounting sleeve, a stop block and a limiting spring connected to the stop block are hingedly arranged on the side wall of the limiting rod, a heat-expandable piece is arranged on the side wall of the limiting rod inside the stop block, and the limiting rod is a metal heat-conducting piece.

[0013] As preferred, the heat-expandable piece comprises a box body and an extrusion piece slidably arranged in the box body, a liquid is filled between the box body and the extrusion piece, and the box body is a metal heat-conducting piece.

[0014] Compared with the prior art, the application has the beneficial effects that: in the application, the driving member is used to drive the toothless gear to rotate, the moving member, the fixed member and the piston are lowered by cooperation with the rack, when the toothless gear is rotated to be not engaged with the rack, the elastic member is elastically expanded to drive the moving member, the fixed member and the piston to move upwards, so that the piston moves reciprocatingly in the test hole, and the driving member is not connected with the moving member in the process that the piston moves to the outside of the test hole, so that the piston moves upwards under the action of the pressure in the test hole and the elastic member, the pressure in the test hole can be utilized, the burden of the driving member is reduced, and the service life of the test device is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the application;

[0016] Figure 2 It is an enlarged schematic diagram of the structure at A of the application;

[0017] Figure 3 It is a schematic diagram of the connecting structure of the base and the test seat of the application;

[0018] Figure 4 It is a schematic diagram of the structure of the gas storage tank of the application;

[0019] Figure 5 It is a schematic diagram of the connecting structure of the mounting sleeve and the limiting rod of the application;

[0020] Figure 6 It is a schematic diagram of the structure of the speed limiting mechanism of the application.

[0021] In the drawing: 1, base; 2, mounting frame; 3, test seat; 4, moving member; 5, fixed member; 6, gas storage tank; 7, controller; 8, rack; 9, driving member; 10, toothless gear; 11, connecting block; 12, elastic member; 13, telescopic member; 14, speed limiting mechanism; 141, contact member; 142, sleeve member; 143, mounting member; 144, push rod; 145, connecting rope; 146, movable rod; 1461, rod body; 1462, guide block; 1463, elastic element; 147, winding member; 15, temperature sensor; 16, groove; 17, pressing plate; 18, heating sheet; 19, pressing member; 20, alarm; 21, pressing block; 22, mounting sleeve; 23, limiting rod; 24, slotted hole; 25, stop block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0023] Embodiment 1

[0024] Please refer to Figure 1 A marine engine piston life test device, comprising: a base 1, an installation frame 2 is installed above the base 1; a test seat 3 and an air storage tank 6 are installed above the base 1; the test seat 3 is provided with a test hole (equivalent to the hole of the cylinder sleeve, so that the tested piston fits) at the top, the air storage tank 6 is communicated with the test hole of the test seat 3 through a pipeline, and a valve is arranged on the pipeline to control the opening and closing of the air storage tank 6, and the air storage tank 6 is provided with an air inlet for supplementing air into the air storage tank 6.

[0025] Please refer to Figure 4 A heating sheet 18 (an electric heating sheet) is installed in the air storage tank 6; a moving piece 4 is slidably arranged on the installation frame 2, and the moving piece 4 can move up and down at the installation frame 2; a fixing piece 5 is arranged at the bottom end of the moving piece 4, and the fixing piece 5 is used for fixing the tested piston and is directly above the test hole.

[0026] In this embodiment, as a further optimized scheme, please refer to Figure 1 The moving piece 4 comprises a rod piece and a moving sleeve slidably arranged on the bottom end of the rod piece, and a bolt is screwed on the moving sleeve to fix the moving sleeve; by changing the position of the moving sleeve, the length of the moving piece 4 can be adjusted according to the requirement, so that one end of the piston can be inserted into the test hole at the beginning of the test, and the piston can be completely removed from the test hole after the test is completed.

[0027] In this embodiment, as a further optimized scheme, please refer to Figure 1 The installation frame 2 is rotatably installed on the base 1; so that the fixing piece 5 can be rotated to the upper side of the test seat 3, or the fixing piece 5 can be rotated away from the upper side of the test seat 3.

[0028] Please refer to Figure 1 And Figure 2 A rack 8 is arranged on the side wall of the moving piece 4, a driving piece 9 is arranged on the installation frame 2, a missing tooth gear 10 (only a part of teeth is arranged on the outer side of the gear, and the teeth are arranged in an arc shape on the outer side of the gear) is arranged on the output shaft of the driving piece 9, and the missing tooth gear 10 is engaged with the rack 8; a connecting block 11 is arranged on the installation frame 2, and an elastic piece 12 is arranged between the connecting block 11 and the installation frame 2.

[0029] It is to be noted that after the piston to be tested is fixed on the fixing member 5, the moving member 4 is adjusted so that the piston to be tested is inserted into the test hole on the test seat 3; then the valve is opened, the air inside the air storage tank 6 enters the test hole, and the heating sheet 18 is opened to heat the air inside the air storage tank 6, so that the test hole is in a high-temperature and high-pressure condition (simulating the working environment of the piston); then the driving member 9 works, the missing tooth gear 10 rotates, when the teeth of the missing tooth gear 10 contact the rack 8, the moving member 4 with the fixing member 5 and the piston will move downward, when the missing tooth gear 10 continues to rotate and the teeth of the missing tooth gear 10 do not contact the rack 8, the moving member 4 loses the downward pressure, under the action of the elastic member 12, the moving member 4 with the fixing member 5 and the piston moves upward; the driving member 9 drives the missing tooth gear 10 to continuously rotate, so that the piston moves up and down in the test hole for testing; in the process of moving the piston downward, the driving member 9 drives the moving, in the process of moving the piston upward, the teeth of the missing tooth gear 10 do not contact the rack 8, the piston is pushed by the air pressure inside the test hole and the elastic member 12 (the piston moves downward, the space inside the test hole is reduced, the pressure inside the test hole is further increased, which provides an upward pushing force for the piston; and the piston moves downward, which also compresses the elastic member 12, after the moving member 4 loses the downward driving force, the elastic member 12 is elastically reset, which provides an upward force for the moving member 4, the fixing member 5 and the piston), which reduces the burden of the driving mechanism and avoids damage to the driving member 9, and reasonably utilizes the pressure.

[0030] In this embodiment, as a further optimized scheme, please refer to Figure 2 , the connecting block 11 and the mounting frame 2 are provided with the telescopic member 13 (the telescopic member 13 includes a telescopic mother rod and a telescopic son rod slidingly inserted into the telescopic mother rod), the telescopic length of the telescopic member 13 is used to limit the upward movement amplitude of the moving member 4; the speed limiting mechanism 14 is arranged on the mounting frame 2;

[0031] Please refer to Figure 6, the speed limiting mechanism 14 comprises a sleeve 142 mounted on the mounting frame 2, a contact piece 141 is slidably arranged in the sleeve 142, a spring piece is arranged between the contact piece 141 and the sleeve 142, and an end of the contact piece 141 away from the sleeve 142 is attached to the side wall of the telescopic sub-rod; the mounting frame 2 is provided with a mounting piece 143, a push rod 144 and a movable rod 146 are slidably arranged on the mounting piece 143, the push rod 144 and the movable rod 146 move in the same direction as the contact piece 141, one end of the push rod 144 is connected with the contact piece 141, and a reset spring is arranged between the movable rod 146 and the mounting piece 143; the mounting piece 143 is rotatably provided with a winding piece 147, a torsion spring is arranged between the mounting piece 143 and the winding piece 147, a connecting rope 145 is wound on the winding piece 147, and two ends of the connecting rope 145 are connected with the push rod 144 and the movable rod 146 respectively; a protrusion is arranged on the side wall of the moving piece 4, and the protrusion is in contact with the end of the movable rod 146 during the up-down movement of the moving piece 4;

[0032] Please refer to Figure 6 , the movable rod 146 comprises a rod body 1461 and a guide block 1462; the guide block 1462 is hingedly arranged below one end of the rod body 1461 facing the moving piece 4 (the guide block 1462 can only rotate downward), an elastic element 1463 is arranged between the guide block 1462 and the rod body 1461, and one side wall below the guide block 1462 facing the moving piece 4 is a slope.

[0033] It should be noted that the convex block will contact the guide block 1462 of the movable rod 146 during the downward movement of the moving part 4, and will extrude the guide block 1462 downward, so that the guide block 1462 rotates downward, which will not affect the downward movement of the moving part 4, and at this time the movable rod 146 will not move; during the upward movement of the moving part 4 (the movable rod 146 is in a lower position, and the convex block can contact the guide block 1462 when the moving part 4 starts to move upward), the convex block will contact the inclined surface of the guide block 1462 of the movable rod 146, and at this time the guide block 1462 cannot rotate, and during the upward movement of the moving part 4 and the convex block, the movable rod 146 will move, pull the connecting rope 145, and make the winding part 147 rotate, so that the connecting rope 145 releases the pulling force on the push rod 144, and through the action of the spring part, the contact part 141 moves to contact the side wall of the telescopic sub-rod, and the friction force between the two contacts is used to reduce the movement speed of the telescopic sub-rod, so that the upward movement speed of the moving part 4 will not be too fast (when the piston starts to move upward, the pressure in the test hole is the largest, and the compression amplitude of the elastic part 12 is the largest, at this time the upward movement speed of the piston will be too fast, and the speed will slowly decrease), so as to avoid that the speed is too fast and the reciprocating speed of the piston in the test hole is relatively large (if the speed is too fast, the moving part 4 will quickly move to the predetermined area, and the driving part 9 drives), so as to avoid affecting the accuracy of the piston test; after the convex block passes the movable rod 146, the movable rod 146 is reset under the action of the reset spring, the winding part 147 is reset under the action of the torsional spring, the connecting rope 145 pulls the push rod 144 and the contact part 141 to reset, so that the contact part 141 does not contact or has small contact pressure with the telescopic sub-rod, which does not affect the normal upward movement of the piston.

[0034] In this embodiment, as a further optimization scheme, please refer to Figure 4 , a pressing plate 17 is slidably arranged in the gas storage tank 6, which is used to discharge the air inside the gas storage tank 6, and a supporting spring is installed between the gas storage tank 6 and the pressing plate 17; a pressing part 19 is arranged in the gas storage tank 6 and located on the moving path of the pressing plate 17 (according to Figure 4The pressing piece 19 is located below the pressing plate 17 in the shown direction, and the pressing piece 19 can be deformed after being pressed; the gas storage tank 6 is externally provided with an alarm 20 (referring to an audible and light alarm), and a pressing block 21 is slidably installed on the outer side of the gas storage tank 6, and a linkage rope is arranged between the pressing block 21 and the pressing piece 19; when a gap is generated between the test hole and the piston, the gas storage tank 6 leaks air in the test hole, the air in the gas storage tank 6 is reduced, the pressing plate 17 is moved to press the pressing piece 19, the linkage rope is pulled to move the pressing block 21 to press the switch of the alarm 20, and the alarm 20 sends an alarm to prompt the staff; and after the piston is inserted into the test hole and before the reciprocating motion is started, the air in the gas storage tank 6 is introduced into the test hole, if there is a gap between the test hole and the piston, the air in the test hole and the gas storage tank 6 will leak, the air pressure in the gas storage tank 6 is reduced, and the pressing plate 17 is lowered to press the pressing piece 19 under the action of the supporting spring, which will make the alarm 20 send an alarm, so that the test hole can be detected (therefore the test hole will also be worn out for a long time), and the test seat 3 can be found in advance when a problem occurs, and the accuracy of the test is ensured.

[0035] In this embodiment, as a further optimized scheme, please refer to Figure 1 and Figure 3 , a recess 16 is arranged in the test hole of the test seat 3, and a temperature sensor 15 is arranged in the recess 16; the temperature sensor 15 is electrically connected to a controller 7 (the controller 7 refers to a PLC controller, and the specific model is S7-300), and the controller 7 is electrically connected to a heating sheet 18; because the piston moves back and forth, the temperature in the test hole rises, and the temperature of the air in the test hole rises, the temperature sensor 15 transmits the detected temperature information to the controller 7, when the air temperature rises, the heating sheet 18 is controlled to reduce the heating temperature, and vice versa, so that the heating sheet 18 is not constant in heating temperature, and energy is saved.

[0036] In this embodiment, as a further optimized scheme, please refer to Figure 4 and Figure 5 , an installation sleeve 22 is arranged on the gas storage tank 6, a limiting rod 23 is slidably arranged in the installation sleeve 22, the moving direction of the limiting rod 23 is the same as the moving direction of the pressing plate 17, and the limiting rod 23 is above the pressing plate 17 (according to Figure 4The spring is arranged between the mounting sleeve 22 and the limiting rod 23; a plurality of groups of slots 24 are formed in the side wall of the mounting sleeve 22, the limiting rod 23 is hingedly connected with a stop block 25, a limiting spring is arranged between the limiting rod 23 and the stop block 25 (the limiting spring pulls the stop block 25 to move towards the side wall of the limiting rod 23), a heat expansion member is arranged on the side wall of the limiting rod 23, the heat expansion member is arranged between the stop block 25 and the limiting rod 23, the limiting rod 23 is a metal heat conducting member (such as iron, copper or the like), the heat expansion member comprises a box body and a pressing member slidingly arranged in the box body, a liquid is filled between the box body and the pressing member, the box body is a metal heat conducting member (such as iron, copper or the like), when the temperature in the test hole and the gas storage tank 6 rises, the temperature is transmitted to the heat expansion member through the limiting rod 23, so that the heat expansion member expands (the liquid in the box body expands, pushes the pressing member to move outwardly, and the pressing member and the box body are sealed), the stop block 25 is pushed outwardly, when the stop block 25 corresponds to the slots 24, the stop block 25 is inserted into the slots 24, so as to prevent the limiting rod 23 from moving upwardly, at this time, the pressing plate 17 also cannot move upwardly, so that the pressing plate 17 is prevented from moving upwardly to cause the internal gas pressure of the test hole to drop (when the pressing plate 17 moves downwardly, the spring pulls the limiting rod 23 to move downwardly).

[0037] Although the embodiments of the present application have been shown and described, it is to be understood that for the purpose of the present application, the embodiments can be substantially changed without departing from the spirit and the scope of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A marine engine piston life test device comprising: The base (1) and the mounting rack (2) arranged on the base (1), characterized in that the test device further comprises a test seat (3) arranged on the base (1) and a gas storage tank (6) in communication with the test hole on the test seat (3); The gas storage tank (6) is provided with a heating sheet (18), and the mounting rack (2) is slidably provided with a moving piece (4) for moving up and down, and the bottom end of the moving piece (4) is provided with a fixing piece (5) for fixing a test piston; A rack (8) is arranged on the side wall of the moving piece (4), and a driving piece (9) is arranged on the mounting rack (2), and a missing tooth gear (10) engaged with the rack (8) is arranged on the output shaft of the driving piece (9), and a connecting block (11) is arranged on the mounting rack (2), and an elastic piece (12) is arranged between the connecting block (11) and the mounting rack (2); A telescopic piece (13) is arranged between the connecting block (11) and the mounting rack (2), and a speed limiting mechanism (14) is arranged on the mounting rack (2) and abuts against the moving end of the telescopic piece (13); The speed limiting mechanism (14) comprises a sleeve (142) arranged on the mounting rack (2), a contact piece (141) abutting against the side wall of the moving end of the telescopic piece (13) is slidably arranged in the sleeve (142), and a spring piece connected with the contact piece (141) is arranged in the sleeve (142), an installation piece (143) is arranged on the mounting rack (2), a push rod (144) moving in the same direction as the contact piece (141) and a movable rod (146) are slidably arranged on the installation piece (143), one end of the push rod (144) is connected with the contact piece (141), a reset spring is arranged between the movable rod (146) and the installation piece (143), a winding piece (147) and a torsional spring connected with the winding piece (147) are rotatably arranged on the installation piece (143), a connecting rope (145) is wound on the winding piece (147), and two ends of the connecting rope (145) are connected with the push rod (144) and the movable rod (146) respectively, and a protrusion is arranged on the side wall of the moving piece (4) and used for contacting the end of the movable rod (146).

2. A marine engine piston life test device according to claim 1, characterized in that: The movable rod (146) comprises a rod body (1461) and a guide block (1462), the guide block (1462) is hinged below one end of the rod body (1461) facing the moving piece (4), an elastic element (1463) is arranged between the guide block (1462) and the rod body (1461), and one side wall below the guide block (1462) facing the moving piece (4) is a slope.

3. A marine engine piston life test device according to claim 1, characterized in that: A pressing plate (17) for discharging air in the gas storage tank (6) and a supporting spring connected with the pressing plate (17) are slidably arranged in the gas storage tank (6), a pressing piece (19) is arranged in the gas storage tank (6) and located on the moving path of the pressing plate (17), an alarm (20) and a pressing block (21) for pressing the switch of the alarm (20) are arranged outside the gas storage tank (6), and a linkage rope is arranged between the pressing block (21) and the pressing piece (19).

4. A marine engine piston life test device according to claim 1, characterized in that: The test hole of the test seat (3) is provided with a recess (16), the recess (16) is provided with a temperature sensor (15), the temperature sensor (15) is electrically connected with a controller (7), and the controller (7) is electrically connected with a heating sheet (18).

5. A marine engine piston life test apparatus according to claim 3, wherein: The installation sleeve (22) is provided on the gas storage tank (6), the installation sleeve (22) is slidably provided with a limiting rod (23) for limiting reverse movement of the pressing plate (17) and a spring connected with the limiting rod (23), a plurality of groups of slotting (24) are formed in the side wall of the installation sleeve (22), the limiting rod (23) is hingedly provided with a stop block (25) and a limiting spring connected with the stop block (25), the side wall of the limiting rod (23) is provided with a heat expansion element on the inner side of the stop block (25), and the limiting rod (23) is a metal heat conducting element.

6. A marine engine piston life test device according to claim 5, characterised in that: The heat expansion element comprises a box body and an extrusion element slidably arranged in the box body, a liquid is filled between the box body and the extrusion element, and the box body is a metal heat conducting element.

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