Air tightness detection clamp for water-cooled engine cylinder body

Abstract

The utility model discloses an air tightness detection clamp for a water-cooled engine cylinder block. The air tightness detection clamp comprises a base, a mounting table, a lifting pressing mechanism, an air inlet plate and a positioning assembly, the cylindrical structure is matched with the outlet of the cooling channel in a self-tightening sealing manner, and the stable pressing of the air cylinder is combined, so that the sealing surfaces are uniformly attached, and missing detection is avoided; the air inlet plate is provided with a positioning pin matched with a positioning hole or a mounting hole in the bottom of the cylinder body, rapid and accurate positioning of the cylinder body is achieved, and dislocation of an inlet of the cooling channel and an air inlet is prevented; the number and length of the pressing rods and the size of the sealing plug can be adjusted, detection of cylinder bodies of various models is supported, frequent replacement of the clamp is not needed, and the detection efficiency is improved; impact is buffered while vertical movement of the lifting platform is guaranteed, and the service life of the sealing plug and the cylinder body is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine parts detection equipment, and in particular relates to a special fixture for detecting the air tightness of a cooling channel of a water-cooled engine cylinder. Background Art

[0002] The cooling channels of a water-cooled engine cylinder block are a core component of its structure. They circulate coolant to lower cylinder block temperatures and ensure stable engine operation. Leaks in these channels can cause coolant to seep into the cylinder block, leading to engine overheating, cylinder seizure, and even failure. Therefore, testing the airtightness of cooling channels is a critical process before cylinder blocks leave the factory.

[0003] In existing technology, air tightness testing of water-cooled engine cylinders is typically performed using a fixture, an air pump, and a leak detector. The typical structure consists of a base, a lifting and clamping mechanism (including a cylinder, a pressure rod, and a sealing plug) mounted above the base, and an air intake plate. The operating principle is as follows: the cylinder is placed on the air intake plate, and the air cylinder drives the pressure rod downward, causing the sealing plug to seal the cooling channel outlet. An air pump then supplies air to the cooling channel inlet through the air intake plate. After maintaining pressure, the pressure changes are used to determine if there is a leak.

[0004] However, the prior art has the following defects:

[0005] 1. Insufficient sealing reliability: The fitting pressure between the sealing plug and the cooling channel outlet depends on the cylinder stroke. Uneven pressure on the pressure rod may lead to local loose sealing, affecting the detection accuracy.

[0006] 2. Low positioning accuracy: There is no precise positioning structure when the cylinder body is placed on the air intake plate, which easily leads to misalignment between the cooling channel inlet and the air intake plate outlet, resulting in abnormal gas leakage path;

[0007] 3. Poor adaptability: The number, position and outlet size of cooling channels of different cylinder models vary greatly. The number of pressure rods and the size of sealing plugs in the existing fixtures are fixed, and the fixtures need to be replaced frequently, resulting in low detection efficiency.

[0008] Therefore, there is an urgent need for a water-cooled engine cylinder air tightness detection fixture with optimized structure, reliable sealing and strong adaptability. Utility Model Content

[0009] In order to solve the above problems, the purpose of this utility model is to provide a water-cooled engine cylinder air tightness detection fixture. By optimizing the lifting and clamping mechanism, adding precise positioning structure and adjustable sealing components, it solves the problems of lax sealing, inaccurate positioning and poor adaptability in the existing technology, and improves the detection accuracy and efficiency.

[0010] To achieve the above-mentioned purpose, the present utility model provides the following technical solutions: a water-cooled engine cylinder air tightness detection fixture, comprising a base, a mounting platform, a lifting and pressing mechanism, an air intake plate and a positioning assembly;

[0011] The base is a horizontally arranged rectangular plate structure, the upper surface of which is fixedly connected to the lower surface of the mounting platform by four vertically distributed straight rods, and the straight rods are used to support the mounting platform and ensure its horizontality;

[0012] The upper surface of the mounting platform is fixedly mounted with a cylinder, and the piston rod of the cylinder vertically passes through the mounting platform downward and is fixedly connected to the lifting platform; the lifting platform is a horizontally arranged square structure, and the upper end of the lifting platform is connected to a vertical guide rod, and a guide hole for the vertical guide rod to penetrate and move is provided on the mounting platform to ensure that it moves in the vertical direction, and the length of the vertical guide rod is greater than the stroke of the cylinder piston rod;

[0013] A plurality of pressure rod mounting positions are evenly distributed on the lower surface of the lifting platform, and each pressure rod mounting position can be fixed with a pressure rod by threaded connection. The pressure rod is a vertically arranged cylindrical rod, and an external thread is provided at its lower end, which is matched with the threaded hole at the upper end of the sealing plug; the sealing plug is made of elastic rubber material, and a buffer airbag chamber is provided in the middle of the sealing plug for buffering the impact force when the cylinder is pressed down, so as to prevent the sealing plug from damaging the cooling channel outlet due to excessive instantaneous pressure, and its lower end surface is used to block the cooling channel outlet;

[0014] The air intake plate is a horizontally arranged square plate structure, fixedly mounted on the upper surface of the base and located directly below the lifting platform; an air intake channel is provided on the upper surface of the air intake plate, the inlet end of which extends to the side of the air intake plate and is connected to a hose connector (the other end of the hose is connected to the air pump), and the outlet end is provided on the surface of the air intake plate, corresponding to the cooling channel of the engine cylinder block. The cooling channel is a plurality of parts surrounding the cylinder bore and connected;

[0015] The positioning assembly includes two positioning pins, which are respectively arranged on the upper surface of the air intake plate and are used to cooperate with the positioning holes or mounting holes at the bottom of the engine cylinder block to achieve rapid and accurate positioning of the cylinder block.

[0016] Furthermore, the number of the pressure rods is consistent with the number of the cooling channel outlets of the engine cylinder block, and the height difference of cylinder blocks of different models can be adapted by replacing pressure rods of different lengths.

[0017] Furthermore, the diameter of the lower end surface of the sealing plug is slightly larger than the inner diameter of the cooling channel outlet (for example, 0.1-0.3 mm larger), and the deformation of the elastic rubber is used to achieve self-tightening sealing, thereby avoiding channel deformation caused by hard extrusion.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. High sealing reliability: The sealing plug is made of elastic rubber. Its cylindrical structure cooperates with the self-tightening seal of the cooling channel outlet, combined with the stable downward pressure of the cylinder to ensure that the sealing surface fits evenly and avoids missed inspections;

[0020] 2. High positioning accuracy: The air intake plate is provided with positioning pins that match the positioning holes or mounting holes at the bottom of the cylinder body, so as to achieve fast and accurate positioning of the cylinder body and prevent the cooling channel entrance and the air intake from being misaligned;

[0021] 3. Strong adaptability: The number, length and size of the pressure rods can be adjusted to support the inspection of various types of cylinders, without the need for frequent fixture replacement, thus improving inspection efficiency;

[0022] 4. Good structural stability: The cooperation between the vertical guide rod and the buffer airbag chamber ensures the vertical movement of the lifting platform while buffering the impact, extending the service life of the sealing plug and the cylinder body.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view of a specific embodiment of the present utility model;

[0025] Figure 2 This is a three-dimensional diagram of the detection state of a specific embodiment of the present utility model.

[0026] Description of reference numerals:

[0027] 1-base; 2-straight rod; 3-mounting platform; 4-cylinder; 5-lifting platform; 6-vertical guide rod; 7-pressure rod; 8-sealing plug; 9-air intake plate; 11-air intake channel; 13-locating pin; 20-engine cylinder block. DETAILED DESCRIPTION

[0028] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] like Figure 1-2 As shown, a water-cooled engine cylinder air tightness detection fixture includes a base 1, a mounting platform 3, a lifting and pressing mechanism, an air intake plate 9 and a positioning assembly;

[0030] The base 1 is a horizontally arranged rectangular plate-like structure, the upper surface of which is fixedly connected to the lower surface of the mounting platform 3 by four vertically distributed straight rods 2. The straight rods 2 are used to support the mounting platform 3 and ensure its horizontality;

[0031] A cylinder 4 is fixedly mounted on the upper surface of the mounting platform 3. The piston rod of the cylinder 4 passes vertically downward through the mounting platform 3 and is fixedly connected to the lifting platform 5. The lifting platform 5 is a horizontally arranged square structure. The upper end surface of the lifting platform 5 is connected to a vertical guide rod 6. A guide hole for the vertical guide rod 6 to penetrate and move is provided on the mounting platform 3 to ensure its vertical movement. The length of the vertical guide rod 6 is greater than the stroke of the piston rod of the cylinder 4.

[0032] There are multiple pressure rod 7 mounting positions evenly distributed on the lower surface of the lifting platform 5. Each pressure rod 7 mounting position can be fixed with a pressure rod 7 by threaded connection. The pressure rod 7 is a vertically arranged cylindrical rod with an external thread at its lower end, which is connected with the threaded hole at the upper end of the sealing plug 8. The sealing plug 8 is a cylindrical structure with a buffer airbag chamber, which is used to buffer the impact force when the cylinder 4 is pressed down, so as to prevent the sealing plug 8 from damaging the cooling channel outlet due to excessive instantaneous pressure. Its lower end surface is used to block the cooling channel outlet.

[0033] The air intake plate 9 is a horizontally arranged square plate-shaped structure, fixedly mounted on the upper surface of the base 1 and located directly below the lifting platform 5. An air intake channel 11 is provided on the upper surface of the air intake plate 9. The inlet end of the air intake channel 11 extends to the side of the air intake plate 9 and is connected to a hose connector (the other end of the hose is connected to the air pump). The outlet end is provided on the surface of the air intake plate 9 and corresponds to the cooling channel of the engine cylinder block. The cooling channel is a plurality of parts surrounding the cylinder bore and connected.

[0034] The positioning assembly includes two positioning pins 13, which are respectively arranged on the upper surface of the air intake plate 9 and are used to cooperate with the positioning holes or mounting holes at the bottom of the engine cylinder block to achieve rapid and accurate positioning of the cylinder block.

[0035] The number of the pressure rods 7 is consistent with the number of the cooling channel outlets of the engine cylinder block, and the height difference of different types of cylinder blocks can be adapted by replacing the pressure rods 7 with different lengths.

[0036] The diameter of the lower end surface of the sealing plug 8 is slightly larger than the inner diameter of the cooling channel outlet (for example, 0.1-0.3 mm larger), and the deformation of the elastic rubber is used to achieve self-tightening sealing to avoid channel deformation caused by hard extrusion.

[0037] The utility model water-cooled engine cylinder air tightness detection fixture is used in the following steps:

[0038] 1. Cylinder positioning: hoist or manually hold the water-cooled engine cylinder 20 to be tested onto the air intake plate 9. The positioning holes or mounting holes on the water-cooled engine cylinder match the positioning pins 13 to achieve precise positioning.

[0039] 2. Install the sealing plug 8: According to the number and size of the cooling channel outlets of the cylinder body 20, select the corresponding number of pressure rods 7 (adjustable length) and sealing plugs 8 (the lower end diameter is slightly larger than the inner diameter of the channel outlet), screw the sealing plugs 8 into the lower end of the pressure rods 7 and secure them;

[0040] 3. Press and seal: Start the cylinder 4. The piston rod of the cylinder 4 pushes the lifting platform 5 to move vertically downward along the vertical guide rod 6. The pressure rod 7 drives the sealing plug 8 to press down until the lower end of the sealing plug 8 completely blocks the cooling channel outlet. The deformation of the elastic rubber is used to achieve self-tightening sealing.

[0041] 4. Ventilation test: The air pump is connected to the hose connector on the side of the air intake plate 9 through a hose to supply air to the air intake channel 11. The air enters the cooling channel of the engine cylinder 20 through the air intake channel 11. After turning off the air pump, the air pressure change in the cooling channel is monitored by a leak detector (maintaining the pressure for 5-10 minutes). If the air pressure drops below the set threshold (e.g., 0.05 MPa), it is determined to be a leak. Reset and remove the component:

[0042] 5. After the inspection is completed, the cylinder 4 drives the lifting platform 5 to rise in the reverse direction, and the pressure rod 7 drives the sealing plug 8 to separate from the cooling channel outlet, and the cylinder body is taken out to complete the inspection.

Claims

1. A water-cooled engine cylinder air tightness detection fixture, comprising a base (1), a mounting platform (3), a lifting and pressing mechanism, an air intake plate (9) and a positioning assembly; the upper surface of the base (1) is fixedly connected to the lower surface of the mounting platform (3) through four vertical straight rods (2); the lifting and pressing mechanism comprises a cylinder (4) fixedly mounted on the upper surface of the mounting platform (3), the piston rod of the cylinder (4) vertically passes through the mounting platform (3) and is fixedly connected to the lifting platform (5), the lifting platform (5) is guided in the vertical direction by a vertical guide rod (6), and a plurality of pressure rods are evenly distributed on the lower surface of the lifting platform (5). Rod mounting position, each pressure rod mounting position is fixed with a pressure rod (7) by a thread, and the lower end of the pressure rod (7) is connected to a sealing plug (8) by a thread; the sealing plug (8) is a cylindrical structure with a buffer airbag chamber; the air intake plate (9) is fixed to the upper surface of the base (1) and is located directly below the lifting platform (5), and the air intake plate (9) is provided with an air intake channel (11), the inlet end of the air intake channel (11) extends to the side of the air intake plate (9) and is connected to a hose connector, and the outlet end corresponds to the inlet position of the cylinder cooling channel; the positioning component includes two positioning pins (13), which are provided on the upper end surface of the air intake plate (9).

2. The water-cooled engine cylinder airtightness detection fixture according to claim 1, characterized in that: The number of the pressure rods (7) is consistent with the number of cylinder cooling channel outlets, and the length is adjustable.

3. The water-cooled engine cylinder airtightness detection fixture according to claim 1, characterized in that: The end face diameter of the sealing plug (8) is 0.1-0.3 mm larger than the inner diameter of the cylinder cooling channel outlet.

Images