Sandblasting gun head, sandblasting machine and method for sandblasting and roughening cylinder bore of engine cylinder block

Abstract

The present invention discloses a sandblasting gun head, a sandblasting machine and a method for sandblasting and roughening the cylinder bore of an engine block. The sandblasting gun head includes a mounting base and is characterized in that it also includes a discharge pipe, an air jet assembly, a driving mechanism and a sealing seat. The upper end of the discharge pipe is connected to a sand material conveying pipe and a negative pressure pipeline, and the negative pressure pipeline and the sand material conveying pipe are arranged at an angle. The sealing seat is fixedly mounted on the mounting base, the sealing seat is hollow inside and is connected to an air inlet pipe, the discharge pipe passes through the mounting base and the sealing seat, and is fixedly connected to the sealing seat. The air jet assembly is sleeved on the discharge pipe and is rotatably connected to the sealing seat. The driving mechanism is mounted on the mounting base and connected to the air jet assembly and is used to drive the air jet assembly to rotate, and the air outlet end of the air jet assembly is located on the side of the discharge pipe. The present invention can effectively solve the technical problem in the prior art that the sandblasting effect is limited by the nozzle discharge port and the sandblasting pressure, and it is difficult to ensure the consistency and uniformity of the roughening effect after sandblasting for the engine cylinder bore.

Description

Technical Field

[0001] The present invention relates to the field of thermal spraying technology, in particular to a sandblasting gun head, a sandblasting machine and a method for sandblasting and roughening a cylinder hole of an engine cylinder block. Background Art

[0002] The engine, the heart of a car, directly impacts its overall performance. Currently, with the trend toward lightweight vehicles, aluminum engines are increasingly used in the automotive industry. Because aluminum alloys lack the wear resistance of cast iron, traditional aluminum engines must be inlaid with cylinder liners to improve wear resistance. However, a disadvantage of cast iron cylinder liners is the seal between the liner and the cylinder block. Due to the different thermal capacitance characteristics of the two materials, this can affect the durability of the engine block. To address this, a new process technology, cylinder bore spraying, also known as cylinder liner-free technology, has been developed. This technology uses cylinder bore spraying to apply a coating to the inner wall of the engine cylinder bore, replacing the traditional cast iron cylinder liner. To ensure the reliability of the cylinder bore coating, the inner wall of the cylinder bore must be roughened before spraying, with sandblasting being one effective method.

[0003] Traditional sandblasting methods include rotary disc blasting and mobile sandblasting. The core component of rotary disc blasting is a rotating disc on which the workpiece is placed. The rotation of the disc evenly blasts the workpiece surface. Simultaneously, the sandblasting gun blasts the workpiece surface as the disc rotates, spraying sand particles onto the workpiece surface to clean and remove impurities. Rotary disc blasting requires a fixed cylinder for blasting: it is not suitable for cylinder blasting and is not practical.

[0004] In addition to rotating the turntable, a turntable sandblaster can also utilize the movement of the sandblasting gun to achieve sandblasting. The sandblasting gun can move horizontally and vertically, allowing for comprehensive sandblasting of the workpiece surface. This method is suitable for fine-tuning specific areas of the workpiece surface or sandblasting large workpieces. Traditional sandblasting with a mobile sandblasting gun can only move the gun horizontally and vertically. Rotary reciprocating sandblasting is not possible, resulting in poor sandblasting results.

[0005] Traditional internal bore sandblasting mechanisms work by mixing compressed air and abrasive material and spraying it through a spray gun, applying the material to the inner wall surface. The sandblasting gun cannot rotate, requiring the workpiece to rotate. The sandblasting effect is limited by the nozzle outlet and the blasting pressure. Furthermore, it is difficult to ensure consistent and uniform roughening results when sandblasting engine cylinder bores. Summary of the Invention

[0006] The object of the present invention is to provide a sandblasting gun head, a sandblasting machine and a method for sandblasting roughening of the cylinder bore of an engine block, which can effectively solve the technical problems in the prior art that the sandblasting effect is limited by the nozzle discharge port and the sandblasting pressure, and at the same time, it is difficult to ensure the consistency and uniformity of the roughening effect for sandblasting roughening of the engine cylinder bore.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A sandblasting gun head for sandblasting and roughening the cylinder bore of an engine cylinder block comprises a mounting seat, a discharge pipe, an air jet assembly, a driving mechanism and a sealing seat. The upper end of the discharge pipe is connected to a sand delivery pipe and a negative pressure pipe, and the negative pressure pipe and the sand delivery pipe are arranged at an angle.

[0009] The sealing seat is fixedly mounted on the mounting seat. The sealing seat is hollow inside and is connected to an air inlet pipe. The discharge pipe passes through the mounting seat and the sealing seat and is fixedly connected to the sealing seat. The jet assembly is sleeved on the discharge pipe and is rotatably connected to the sealing seat.

[0010] The driving mechanism is installed on the mounting seat and connected to the jet assembly and is used to drive the jet assembly to rotate. The air outlet end of the jet assembly is located on the side of the discharge pipe, and the air outlet direction of the air outlet end of the jet assembly is perpendicular to the discharge direction of the discharge pipe.

[0011] Furthermore, the jet assembly includes a connecting ring, a connecting flange, a compressed air nozzle and a plurality of connecting pipes. The connecting ring is hollow inside, the compressed air nozzle is connected to the connecting ring and communicates with the inside of the connecting ring, the connecting ring and the connecting flange are both provided with vents, and both ends of the connecting pipes are respectively connected to the vents on the connecting ring and the connecting flange;

[0012] The driving mechanism includes a motor, a driving pulley and a driven pulley. The driven pulley is provided with a first vent hole corresponding to the vent hole. The connecting flange is connected to the driven pulley. The upper end of the driven pulley is rotatably sealed and connected to the sealing seat. The discharge pipe passes through the driven pulley and is rotatably sealed and connected to the driven pulley. The motor is fixedly installed on the mounting seat, the driving pulley is connected to the motor output shaft, and the driving pulley and the driven pulley are connected by a belt.

[0013] Preferably, both the driving pulley and the driven pulley are toothed pulleys, and the belt is a toothed belt.

[0014] Preferably, the compressed air nozzle is L-shaped, and the air outlet end of the compressed air nozzle has an arc-shaped notch, and the inner diameter of the arc-shaped notch is the same as the inner diameter of the discharge pipe.

[0015] Preferably, the air outlet end of the compressed air nozzle is a flat structure.

[0016] Preferably, the hollow area inside the connecting ring forms an air storage chamber.

[0017] Preferably, an O-ring is provided at the vent hole between the driven pulley and the connecting flange.

[0018] In addition, the present invention also discloses an engine cylinder block cylinder bore sandblasting and roughening sandblasting machine, which includes a frame, a drive assembly arranged on the frame, and a main shaft connected to the drive assembly. The main shaft is connected to a sandblasting gun head, and the sandblasting gun head is the above-mentioned engine cylinder block cylinder bore sandblasting and roughening sandblasting gun head.

[0019] At the same time, the present invention also discloses a method for sandblasting and roughening the cylinder bore of an engine cylinder block, which comprises using the above-mentioned sandblasting gun head for sandblasting and roughening the cylinder bore of the engine cylinder block to perform sandblasting and roughening.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention is applicable to the sandblasting roughening of cylinder bores of different models of engines: the sandblasting gun is rotated, and the workpiece is fixed for roughening operations; the consistency and uniformity of the surface state after sandblasting roughening are ensured; the sandblasting pressure control range of the present invention is increased, and the sandblasting pressure will directly determine the impact force of the sandblasting material on the cylinder bore surface. Excessively high sandblasting pressure may cause wear of the cylinder bore, while excessively low sandblasting pressure cannot achieve the ideal sandblasting effect. The sandblasting pressure of traditional sandblasting mechanisms comes from the negative pressure pipeline. If the sandblasting pressure is set too low, the sandblasting port will not be able to reach the negative pressure that can transport sand particles. The present invention achieves the effect that the sandblasting pressure is not affected by the pressure of the negative pressure pipeline by adding an air nozzle at the end of the discharge pipe.

[0022] The present invention increases the blasting range: Traditional sandblasting mechanisms utilize a rotating sandblasting gun, with the discharge end bent. This restricts the sand's trajectory and thus affects the distribution of the sand particles. By adding an air nozzle to the discharge nozzle, the sand falling vertically is sprayed onto the cylinder bore surface by a horizontally rotating airflow, increasing the distribution of the sand particles and achieving a more uniform blasting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the present invention.

[0025] Figure 2 This is one of the schematic diagrams of the connection relationship between the rotating assembly and the discharge pipe of the present invention.

[0026] Figure 3 This is the second schematic diagram of the connection relationship between the rotating assembly and the discharge pipe of the present invention.

[0027] Figure 4 Schematic diagram of the connection relationship between the drive assembly and the sealing seat in the second embodiment of the present invention.

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of the overall structure after removing the mounting base.

[0029] Figure 6 It is a schematic diagram of the overall structure of the driven pulley of the present invention.

[0030] Figure 7 For the present invention Figure 2 A partial enlarged schematic diagram of point A in the middle.

[0031] Reference numerals:

[0032] 101-mounting seat, 102-discharge pipe, 103-injection assembly, 104-driving mechanism, 105-sealing seat, 106-sand delivery pipe, 107-negative pressure pipeline, 108-inlet pipe, 109-connecting ring, 110-connecting flange, 111-compressed air nozzle, 112-connecting pipe, 113-vent, 114-motor, 115-driving pulley, 116-driven pulley, 117-arc-shaped notch, 118-air storage chamber, 119-spindle, 120-driving assembly, 121-first vent. DETAILED DESCRIPTION

[0033] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0034] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0036] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] See Figure 1-Figure 7This embodiment discloses a sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block, comprising a mounting base 101, a discharge pipe 102, an injection assembly 103, a drive mechanism 104, and a sealing base 105. The upper end of the discharge pipe 102 is connected to a sand delivery pipe 106 and a negative pressure pipe 107. The negative pressure pipe 107 is arranged at an angle to the sand delivery pipe 106.

[0042] The sealing seat 105 is fixedly mounted on the mounting seat 101. The sealing seat 105 is hollow inside and is connected to the air inlet pipe 108. The discharge pipe 102 passes through the mounting seat 101 and the sealing seat 105 and is fixedly connected to the sealing seat 105. The injection assembly 103 is sleeved on the discharge pipe 102 and is rotatably connected to the sealing seat 105.

[0043] The driving mechanism 104 is installed on the mounting base 101 and connected to the jet assembly 103 and is used to drive the jet assembly 103 to rotate. The air outlet end of the jet assembly 103 is located on the side of the discharge pipe 102, and the air outlet direction of the air outlet end of the jet assembly 103 is perpendicular to the discharge direction of the discharge pipe 102.

[0044] In actual use, the negative pressure pipe 107 is provided to form a negative pressure in the sand material conveying pipe 106, so that the sand material can enter the discharge pipe 102. At the same time, the driving mechanism 104 is provided to drive the jet assembly 103 to rotate. Since the air outlet end of the jet assembly 103 is located on the side of the discharge pipe 102, the air outlet direction of the jet assembly 103 is perpendicular to the discharge direction of the discharge pipe 102. In this way, the jet assembly can be rotated so that the surface of the workpiece can be evenly sandblasted. The sandblasting operation is carried out while rotating, and the sandblasting particles are sprayed onto the surface of the workpiece to achieve the effect of cleaning and removing impurities.

[0045] The jet assembly 103 includes a connecting ring 109, a connecting flange 110, a compressed air nozzle 111, and a plurality of connecting pipes 112. The connecting ring 109 is hollow, and the compressed air nozzle 111 is connected to the connecting ring 109 and communicates with the interior of the connecting ring 109. Both the connecting ring 109 and the connecting flange 110 are provided with vents 113. The ends of the connecting pipes 112 are respectively connected to the vents 113 on the connecting ring 109 and the connecting flange 110.

[0046] The driving mechanism 104 includes a motor 114, a driving pulley 115 and a driven pulley 116. The driven pulley 116 is provided with a first vent hole 121 corresponding to the vent hole 113. The connecting flange 110 is connected to the driven pulley 116. The upper end of the driven pulley 116 is rotatably sealed and connected to the sealing seat 105; the discharge pipe 102 passes through the driven pulley 116 and is rotatably sealed and connected to the driven pulley 116. The motor 114 is fixedly mounted on the mounting seat 101, the driving pulley 115 is connected to the output shaft of the motor 114, and the driving pulley 115 and the driven pulley 116 are connected by a belt.

[0047] In actual use, the upper end of the driven pulley 116 extends into the sealing seat 105 , and a rotating sealing ring is provided between the driven pulley 116 and the sealing seat 105 .

[0048] When in use, the motor 114 is started, and under the action of the driving pulley 115 and the belt, the driven pulley 116 is driven, and the driven pulley 116 is rotatably and sealedly connected to the upper end and the sealing seat 105; the discharge pipe 102 passes through the driven pulley 116 and is rotatably and sealedly connected to the driven pulley 116, and the high-pressure gas in the intake pipe 108 will enter the sealing seat 105, the driven pulley 116, the connecting pipe 112, the connecting ring 109 in turn, and then enter the compressed air nozzle 111, thereby blowing the sand material toward the cylinder body.

[0049] The driving pulley 115 and the driven pulley 116 are both toothed pulleys, and the belt is a toothed belt.

[0050] Further optimized, the compressed air nozzle 111 is L-shaped, and the air outlet end of the compressed air nozzle 111 has an arc-shaped notch 117. The inner diameter of the arc-shaped notch 117 is the same as the inner diameter of the discharge pipe 102 to avoid affecting the falling sand material.

[0051] The air outlet end of the compressed air nozzle 111 is a flat structure, which speeds up the flow rate of the compressed air.

[0052] The hollow area inside the connecting ring 109 forms an air storage chamber 118 .

[0053] For further optimization, an O-ring is provided between the driven pulley 116 and the vent hole 113 of the connecting flange 110 .

[0054] Example 2

[0055] This embodiment discloses a sandblasting machine for sandblasting and roughening the cylinder bore of an engine block. The machine comprises a frame, a drive assembly 120 mounted on the frame, and a spindle 119 connected to the drive assembly 120. The spindle 119 is connected to a sandblasting gun head, which is the sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block described in Example 1. In actual use, the spindle 119 is fixedly connected to the sealing seat 105.

[0056] The drive assembly 120 is provided to realize the vertical drive of the sandblasting gun head, thereby realizing sandblasting treatment at different positions; the drive mechanism 104 can adopt the vertical drive mechanism in the prior art, such as a hydraulic or pneumatic drive mechanism, which will not be described in detail here.

[0057] This embodiment also discloses a method for sandblasting and roughening the cylinder bore of an engine block, which mainly uses the sandblasting gun head for sandblasting and roughening the cylinder bore of the engine block described in the first embodiment to perform sandblasting and roughening.

[0058] In order to facilitate those skilled in the art to further understand the present invention, the present invention is further explained below in combination with specific principles.

[0059] The present invention forms a negative pressure at the inlet of the sand delivery pipe 106 by the rapid flow of compressed air in the negative pressure pipeline 107, thereby sucking the sand into the discharge pipe 102; and by installing a jet assembly 103 on the side of the discharge end of the discharge pipe 102, and driving the jet assembly 103 to rotate through the driving mechanism 104. When the sand is ejected vertically downward from the discharge pipe 102 and encounters the compressed air ejected from the high-speed rotating driving jet assembly 103, the compressed air sprays the sand onto the surface of the cylinder hole, thereby achieving sandblasting roughening of the engine cylinder hole.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block, comprising a mounting seat, characterized in that: The invention also includes a discharge pipe, an air injection assembly, a driving mechanism and a sealing seat. The upper end of the discharge pipe is connected to a sand material conveying pipe and a negative pressure pipe. The negative pressure pipe and the sand material conveying pipe are arranged at an angle. The sealing seat is fixedly mounted on the mounting seat. The sealing seat is hollow inside and is connected to an air inlet pipe. The discharge pipe passes through the mounting seat and the sealing seat and is fixedly connected to the sealing seat. The jet assembly is sleeved on the discharge pipe and is rotatably connected to the sealing seat. The driving mechanism is installed on the mounting base and connected to the jet assembly and is used to drive the jet assembly to rotate. The air outlet end of the jet assembly is located on the side of the discharge pipe, and the air outlet direction of the air outlet end of the jet assembly is perpendicular to the discharge direction of the discharge pipe; the jet assembly includes a connecting ring, a connecting flange, a compressed air nozzle and a plurality of connecting pipes. The interior of the connecting ring is hollow, the compressed air nozzle is connected to the connecting ring and communicates with the interior of the connecting ring, and vents are provided on the connecting ring and the connecting flange. The two ends of the connecting pipe are respectively connected to the vents on the connecting ring and the connecting flange. The driving mechanism includes a motor, a driving pulley and a driven pulley, the driven pulley is provided with a first vent hole corresponding to the vent hole, the connecting flange is connected to the driven pulley, and the upper end of the driven pulley is rotatably sealed and connected to the sealing seat; the discharge pipe passes through the driven pulley and is rotatably sealed and connected to the driven pulley, the motor is fixedly mounted on the mounting seat, the driving pulley is connected to the motor output shaft, and the driving pulley and the driven pulley are connected by a belt; The compressed air nozzle is L-shaped, and the outlet end of the compressed air nozzle has an arc-shaped notch, the inner diameter of which is the same as the inner diameter of the discharge pipe; The hollow area inside the connecting ring forms an air storage chamber.

2. The sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block according to claim 1, characterized in that: The driving pulley and the driven pulley are both toothed pulleys, and the belt is a toothed belt.

3. The sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block according to claim 1, characterized in that: The air outlet end of the compressed air nozzle is a flat structure.

4. The sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block according to claim 1, characterized in that: An O-type sealing ring is provided at the vent hole between the driven pulley and the connecting flange.

5. An engine cylinder bore sandblasting and roughening machine, characterized by: The invention comprises a frame, a driving assembly arranged on the frame, and a main shaft connected to the driving assembly. The main shaft is connected to a sandblasting gun head, and the sandblasting gun head is the sandblasting gun head for roughening sandblasting of the cylinder bore of the engine cylinder block according to any one of claims 1 to 4.

6. A method for sandblasting roughening of an engine cylinder bore, characterized in that: Sandblasting and roughening are performed using the sandblasting gun head for sandblasting and roughening the cylinder bore of an engine block as described in claims 1 to 4.

Images