Low-speed running driving device for pavement maintenance truck

Abstract

The invention relates to a pavement maintenance truck low-speed running driving device which comprises a driving device body installed on a pavement maintenance tail frame, the driving device body is composed of an installation frame and hydraulic oil cylinders, and the hydraulic oil cylinders are vertically installed at the positions, close to the bottom of the frame, of the left side and the right side of the tail frame respectively. A horizontally-arranged installation frame is arranged under the two hydraulic oil cylinders, the two sides of the top of the installation frame are welded to the bottoms of piston rods in the two hydraulic oil cylinders respectively, a driving mechanism is installed at the bottom of the installation frame, and when the pavement maintenance truck runs at a high speed, the piston rods of the hydraulic oil cylinders retract to drive the installation frame to ascend; the driving mechanism is not contacted with the ground; when the pavement maintenance vehicle runs at a low speed, the vehicle is in a neutral gear, the piston rod of the hydraulic oil cylinder extends out to drive the mounting frame to descend, and the driving mechanism on the mounting frame is in contact with the ground, so that the maintenance vehicle runs at a low speed during construction. The whole structure is simple and reasonable, installation and maintenance are convenient, and operation is safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment and relates to a low-speed driving device for a road maintenance vehicle. Background Art

[0002] After a period of use, asphalt pavement often suffers from various diseases, including cracking, rutting, subsidence, bulging, waves, grain loss, looseness, peeling, etc. At this time, it is necessary to use a road maintenance vehicle to maintain and repair it. At present, maintenance vehicles are comprehensive road maintenance vehicles that integrate heating, milling, paving and compaction functions. However, due to the use of a car chassis travel system, the existing comprehensive maintenance vehicle will be very fast even if the car is in the first gear state, and it cannot meet the construction requirements of heating, milling, paving and compaction; if a half-clutch is used to reduce the speed, the power is insufficient and the damage of the car clutch will be accelerated. When the traditional car chassis needs to achieve a low-speed travel function during construction, the friction wheel is mainly used to drive the rear wheel of the car chassis to provide slow travel power; this solution causes greater wear on the rear wheel of the car, affecting the driving safety of the vehicle.

[0003] Therefore, a low-speed driving device for a road maintenance vehicle is designed to overcome the above problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a low-speed driving device for a road maintenance vehicle which has a simple and reasonable structure, is easy to install and maintain, and is safe and reliable in operation. It does not require any changes to the original vehicle chassis transmission system, and can achieve high-speed driving of the vehicle and low-speed driving during construction operations, and the driving speed is easy to control.

[0005] The present invention is realized through the following technical scheme: a low-speed driving device for a road maintenance vehicle, comprising a driving device body installed on a rear frame of the road maintenance vehicle, the driving device body consisting of a mounting frame and a hydraulic cylinder, at least two hydraulic cylinders, which are respectively vertically installed on the left and right sides of the rear frame near the bottom position of the frame, a protective guide mechanism is arranged on the outside of each hydraulic cylinder, and a horizontally arranged mounting frame is arranged directly below the two hydraulic cylinders, the top two sides of the mounting frame are respectively welded to the bottom of the piston rods in the two hydraulic cylinders, and a driving mechanism is installed at the bottom of the mounting frame, when the road maintenance vehicle is traveling at high speed, the piston rod of the hydraulic cylinder retracts, driving the mounting frame to rise, and the driving mechanism does not contact the ground; when the road maintenance vehicle is traveling at low speed and the vehicle is in neutral gear, the piston rod of the hydraulic cylinder extends to drive the mounting frame to descend, and contacts the ground through the driving mechanism on the mounting frame, thereby realizing the need for low-speed driving of the maintenance vehicle during construction.

[0006] Preferably, a cylinder connecting ear seat is provided on both sides of the top surface of the mounting frame for fixed connection with the protective guide mechanism outside each hydraulic cylinder, and a mounting seat is provided on the bottom surface of the mounting frame for fixedly installing the driving mechanism.

[0007] Preferably, the driving mechanism consists of a driving shaft, a driving wheel and a hydraulic motor, and the mounting seat on the bottom of the mounting frame consists of at least two bearing mounting seats with mounting through holes and a motor mounting seat. After at least one set of driving wheels is sleeved on the driving shaft, the driving shaft is horizontally inserted into and passes through each mounting through hole. One end of the driving shaft is connected to the hydraulic motor through a coupling, and the hydraulic motor is mounted on the motor mounting seat. A bearing with a seat is installed on the other end of the driving shaft to prevent the driving wheel from falling out during operation.

[0008] Preferably, the protective guide mechanism is a guide cylinder assembly, which is sleeved between the cylinder barrel of the hydraulic cylinder and the mounting frame and is located outside the piston rod of the hydraulic cylinder, and the guide cylinder assembly consists of an upper guide cylinder and a lower guide cylinder, the diameter of the lower guide cylinder is smaller than that of the upper guide cylinder, the lower guide cylinder is arranged in the upper guide cylinder and is movably connected to the upper guide cylinder, and a guide cylinder connecting ear seat is provided at the bottom of the lower guide cylinder and is fixedly connected to the cylinder connecting ear seat, and the lower guide cylinder moves up and down in the upper guide cylinder as the piston rod of the hydraulic cylinder is extended and retracted, so as to protect the piston rod and reduce the wear of the piston rod during operation.

[0009] Preferably, the telescopic length of the upper guide cylinder and the lower guide cylinder is greater than the telescopic length of the hydraulic cylinder piston rod.

[0010] Preferably, the driving wheel is made of rubber or silicone to increase the friction between the driving wheel and the ground.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The low-speed driving device for road maintenance vehicles designed by the present invention can satisfy both high-speed driving of the vehicle and low-speed walking during construction work, and the driving speed is easy to control. The present invention has many advantages such as simple and reasonable overall structure, convenient installation and maintenance, safe and reliable operation, and no need to make any changes to the original vehicle chassis transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a main schematic diagram of the present invention when it is working.

[0013] Figure 2 It is a left side schematic diagram when the present invention is working.

[0014] Figure 3 It is a front view schematic diagram of the present invention when not in operation.

[0015] Figure 4It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 5 It is a front view schematic diagram of the mounting frame in the present invention.

[0017] Figure 6 It is a structural schematic diagram of the guide cylinder assembly in the present invention. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] In the description of the present invention, it is necessary to understand that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inside", "outside", "horizontal" and "vertical" is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or original referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] The present invention will be described in detail below with reference to the accompanying drawings: Figure 1-4As shown, a low-speed driving device for a road maintenance vehicle comprises a driving device body installed on a rear frame of the road maintenance vehicle, the driving device body consists of a mounting frame 1 and a hydraulic cylinder 2, there are at least two hydraulic cylinders 2, which are respectively vertically installed on the left and right sides of the rear frame near the bottom position of the frame, a protection guide mechanism is arranged on the outside of each hydraulic cylinder, and a horizontally arranged mounting frame 1 is arranged directly below the two hydraulic cylinders 2, the top two sides of the mounting frame 1 are respectively welded to the bottom of the piston rods in the two hydraulic cylinders 2, and a driving mechanism is installed at the bottom of the mounting frame 1, when the road maintenance vehicle is traveling at high speed, the maintenance vehicle is traveling on the chassis of the vehicle, the piston rod of the hydraulic cylinder 2 is retracted, driving the mounting frame to rise, and the driving mechanism is not in contact with the ground; when the road maintenance vehicle is traveling at low speed and the vehicle is in neutral gear, the piston rod of the hydraulic cylinder 2 is extended to drive the mounting frame 1 to descend, and the mounting frame is in contact with the ground through the driving mechanism on the mounting frame, so as to meet the need of low-speed driving during construction of the maintenance vehicle. A cylinder connecting ear seat 3 is respectively arranged on both sides of the top surface of the mounting frame 1, which is used to be fixedly connected with the protection guide mechanism outside each hydraulic cylinder 2. A mounting seat is respectively arranged on the bottom surface of the mounting frame 1, which is used to fix and install the driving mechanism. The driving mechanism is composed of a driving shaft 4, a driving wheel 5 and a hydraulic motor 6. The mounting seat on the bottom surface of the mounting frame 1 is composed of at least two bearing mounting seats 7 with mounting through holes and a motor mounting seat 8. After at least one set of driving wheels 5 is sleeved on the driving shaft 4, the driving shaft 4 is horizontally inserted and passes through each mounting through hole. One end of the driving shaft 4 is connected to the hydraulic motor 6 through a coupling 9. The hydraulic motor 6 is mounted on the motor mounting seat 8. A seat bearing 14 is installed on the other end of the driving shaft 4 to prevent the driving wheel 5 from falling out during operation.

[0021] The hydraulic oil cylinders in the present invention are provided in two pieces, and when the ground is uneven, the left and right oil cylinders can extend to different lengths, thereby ensuring that the driving wheel is pressed tightly against the ground.

[0022] like Figure 5-6 As shown, the protection guide mechanism is a guide cylinder assembly, which is sleeved between the cylinder barrel of the hydraulic oil cylinder 2 and the mounting frame 1 and is located outside the piston rod of the hydraulic oil cylinder 2, and the guide cylinder assembly is composed of an upper guide cylinder 10 and a lower guide cylinder 11. The diameter of the lower guide cylinder 11 is smaller than that of the upper guide cylinder 10. The lower guide cylinder 11 is arranged in the upper guide cylinder 10 and is movably connected to the upper guide cylinder 10. A guide cylinder connecting ear seat 12 is arranged at the bottom of the lower guide cylinder 11 and is fixedly connected to the cylinder connecting ear seat 3. The lower guide cylinder 11 moves up and down in the upper guide cylinder 10 as the piston rod of the hydraulic oil cylinder 2 is extended and retracted, thereby protecting the piston rod and reducing the wear of the piston rod during operation. The telescopic length of the upper guide cylinder 10 and the lower guide cylinder 11 is greater than the telescopic length of the piston rod of the hydraulic oil cylinder 2. The driving wheel 5 is made of rubber or silicone to increase the friction between the driving wheel 5 and the ground.

[0023] In the present invention, the upper guide cylinder and the lower guide cylinder are installed on the same axis and can be freely extended and retracted. The extension length is greater than the extension length of the hydraulic cylinder, which can not only ensure the normal use of the piston rod and protect the piston rod, but also prevent the lower guide cylinder from falling out of the upper guide cylinder (the lower guide cylinder and the piston rod of the hydraulic cylinder are fixedly connected to the mounting seat and extend and retract at the same time. The extension length is greater than the extension length of the hydraulic cylinder, which can ensure that when the piston rod is in the longest extended state, the lower guide cylinder part is still in the upper guide cylinder).

[0024] The working principle of the present invention is as follows: When the maintenance vehicle is traveling at a low speed, the vehicle is in neutral gear, the hydraulic cylinder extends, pressing the drive wheel against the ground to provide the pressure required for friction, the hydraulic motor drives the drive wheel to rotate, and the friction generated by the drive wheel and the ground drives the vehicle to move. The driving speed is controlled by the speed of the hydraulic motor, and the driving direction is controlled by the rotation direction of the hydraulic motor, thereby meeting the need for low-speed driving of the maintenance vehicle during construction.

[0025] When driving at high speed, the hydraulic cylinder retracts, separating the driving wheels from the ground, and the maintenance vehicle is transformed into a car chassis for driving, thereby meeting the need for high-speed driving of the maintenance vehicle.

[0026] The low-speed driving device for a road maintenance vehicle designed by the present invention can meet the needs of both high-speed driving of the vehicle and low-speed walking during construction operations, and the driving speed is easy to control. It has many advantages, such as simple and reasonable overall structure, convenient installation and maintenance, safe and reliable operation, and no need to make any changes to the original vehicle chassis transmission system.

[0027] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A low-speed driving device for a road maintenance vehicle, comprising a driving device body mounted on a rear frame of the road maintenance vehicle, characterized in that: The driving device body is composed of a mounting frame (1) and a hydraulic cylinder (2). There are at least two hydraulic cylinders (2), which are respectively vertically mounted on the left and right sides of the rear frame (13) near the bottom of the frame. A protective guide mechanism is arranged on the outside of each hydraulic cylinder, and a horizontally arranged mounting frame (1) is arranged directly below the two hydraulic cylinders (2). The top two sides of the mounting frame (1) are respectively welded to the bottom of the piston rods in the two hydraulic cylinders (2), and a driving mechanism is installed at the bottom of the mounting frame (1). When the road maintenance vehicle is traveling at high speed, the piston rod of the hydraulic cylinder (2) retracts, driving the mounting frame to rise, and the driving mechanism does not contact the ground. When the road maintenance vehicle is traveling at low speed and the vehicle is in neutral gear, the piston rod of the hydraulic cylinder (2) extends to drive the mounting frame (1) to descend, and the driving mechanism on the mounting frame contacts the ground, thereby meeting the need for the maintenance vehicle to travel at low speed during construction.

2. The low-speed driving device for a road maintenance vehicle according to claim 1, characterized in that: A cylinder connecting ear seat (3) is respectively arranged on both sides of the top surface of the mounting frame (1) for fixedly connecting with the protection guide mechanism outside each hydraulic cylinder (2), and a mounting seat is respectively arranged on the bottom surface of the mounting frame (1) for fixedly mounting the drive mechanism.

3. The low-speed driving device for a road maintenance vehicle according to claim 1, characterized in that: The driving mechanism is composed of a driving shaft (4), a driving wheel (5) and a hydraulic motor (6); the mounting seat on the bottom surface of the mounting frame (1) is composed of at least two bearing mounting seats (7) with mounting through holes and a motor mounting seat (8); after at least one set of driving wheels (5) is sleeved on the driving shaft (4), the driving shaft (4) is horizontally inserted and passes through each mounting through hole; one end of the driving shaft (4) is connected to the hydraulic motor (6) through a coupling (9); the hydraulic motor (6) is mounted on the motor mounting seat (8); and a seated bearing (14) is mounted on the other end of the driving shaft (4) to prevent the driving wheel (5) from falling out during operation.

4. The low-speed driving device for a road maintenance vehicle according to claim 2 or 3, characterized in that: The protective guide mechanism is a guide cylinder assembly, which is sleeved between the cylinder barrel of the hydraulic cylinder (2) and the mounting frame (1) and is located outside the piston rod of the hydraulic cylinder (2). The guide cylinder assembly consists of an upper guide cylinder (10) and a lower guide cylinder (11). The diameter of the lower guide cylinder (11) is smaller than that of the upper guide cylinder (10). The lower guide cylinder (11) is arranged in the upper guide cylinder (10) and is movably connected to the upper guide cylinder (10). A guide cylinder connecting ear seat (12) is arranged at the bottom of the lower guide cylinder (11) and is fixedly connected to the cylinder connecting ear seat (3). The lower guide cylinder (11) moves up and down in the upper guide cylinder (10) as the piston rod of the hydraulic cylinder (2) is extended and retracted, thereby protecting the piston rod and reducing the wear of the piston rod during operation.

5. The low-speed driving device for a road maintenance vehicle according to claim 4, characterized in that: The telescopic length of the upper guide cylinder (10) and the lower guide cylinder (11) is greater than the telescopic length of the piston rod of the hydraulic cylinder (2).

6. The low-speed driving device for a road maintenance vehicle according to claim 3 or 5, characterized in that: The driving wheel (5) is made of rubber or silicone and is used to increase the friction between the driving wheel (5) and the ground.

Images