CN218400764U - A mid-mounted lifting type unit support transport vehicle - Google Patents

Abstract

The utility model relates to a central lifting type unit support transport vehicle, which comprises a head unit, a central lifting load-bearing unit and a tail unit respectively arranged from front to rear. The supporting mechanism, the boat-shaped vehicle frame includes the middle support frame and the front-end platform and the rear-end platform; the middle lifting and loading mechanism is located at the front and rear ends of the support frame, including two lifting arms, four luffing jacks, two The connecting mechanism, the lifting structure at the top of the boom, and the hydraulic support mechanism are arranged at the front and rear ends of the support frame, including four horizontal telescopic arms and four support legs. The outer end of the main body is mainly composed of a vertical jack, and the supporting legs are supported on the ground when the vertical jack is stretched out. The structure of the middle lifting loading mechanism and the hydraulic support mechanism in the utility model is novel and reasonable, and can solve the technical problems existing in the prior art.

Description

A mid-mounted lifting type unit support transport vehicle

technical field

The utility model relates to the technical field of coal mine underground equipment, more specifically, it relates to a mid-mounted lifting type unit support transport vehicle.

Background technique

The unit hydraulic support (referred to as the unit support) has the advantages of simple and reliable structure, small size, light weight, and flexible use. It is especially suitable for the advance support of the two lanes of the underground coal mining face. It has been popularized and used, and has replaced the traditional single prop to become a more efficient and safer hydraulic support product. The conventional transportation methods of unit brackets are mainly rail flatbed trucks with small winches or monorail cranes. These two methods can realize the basic transportation of unit brackets, but there are still complex conditions of use, high costs, low handling efficiency, and labor and time consuming. There are many disadvantages, such as high labor intensity, and the flatbed truck is equipped with a winch. The track needs to be arranged in advance. The monorail crane needs a good roof condition and can hang the monorail crane equipment. The applicable conditions are relatively high, and it is not flexible enough when used in coal mines. lower down.

In view of the problems raised above, the Chinese utility model patent document with the publication number CN112390195B discloses a mining fork-mounted unit support truck, including a frame platform, a support leg mechanism installed on the front end of the frame platform and a support leg mechanism installed on the vehicle. The crawler-type traveling drive mechanism under the frame platform. The mast mechanism, driver's cab, power box and counterweight device are installed on the frame platform in sequence from front to back. There is a luffing oil cylinder that can control the forward or backward tilt of the mast mechanism between the gantry platforms. The supporting leg mechanism and the outer side of the mast mechanism are connected with an outrigger oil cylinder that drives the supporting leg mechanism to extend out and touch the ground for support. The above mining The fork-mounted unit support truck adopts a crawler-type walking drive mechanism, which can adapt to complex road conditions underground. The fork-mounted mechanism is flexible in handling, strong in capacity, and reduces the labor intensity of employees, but there are still the following problems to be overcome: 1. Difficulties in maintenance: fork-mounted The structure of the mechanism is complicated, maintenance is difficult, and the cost is high; 2. The stability and safety of the handling process are poor: the supporting leg mechanism only supports the ground at the front end of the frame platform, and the stability is not good. The front end of the frame platform and the rear of the frame platform need to be equipped with a large weight counterweight to ensure the stability of the vehicle body; 3. The equipment consumes a lot of energy: the fork-loading mechanism is always in the suspended state of work during transportation, and the equipment consumes a lot of energy; 4. Poor trafficability: the handling unit When supporting, the front fork-mounting mechanism needs to lift the unit support to a certain height, and it is difficult to pass through when the coal mine roadway is low; 5. Exhaust gas pollution: the truck uses a diesel internal combustion engine as the power source, and there is inevitably exhaust gas emission and pollution. The fresh air flow underground affects the ventilation.

Utility model content

The purpose of the utility model is to propose a central lifting type unit support transport vehicle, which can solve the difficulties in maintenance, poor stability and passability during the transportation process, and equipment consumption in the prior art. Can be a big technical problem.

The utility model provides the following technical scheme: a central lifting type unit support carrier, including a head unit, a middle lifting load-bearing unit, and a tail unit respectively arranged from front to back, and the middle lift load-bearing unit includes a boat-shaped frame and a The middle lifting and loading mechanism and hydraulic support mechanism on the boat-shaped frame, the two ends of the boat-shaped frame are high and the middle is low, including the middle support frame and the front-end platform and the rear-end platform at both ends; the middle-mounted lifting and loading mechanism is located at the The front and rear ends of the support frame include two lifting arms, four luffing jacks, two connecting mechanisms, and a lifting structure located at the top of the lifting arms. The two lifting arms are symmetrically arranged at the front and rear ends of the support frame. The jacks are located on the left and right sides of the boom. Inside the boom, there is a first hydraulic jack for expansion and contraction. The lower ends of the boom and the luffing jack are respectively connected to the support frame in rotation, and the upper ends of the boom and the luffing jack are respectively connected to the connecting mechanism. The hydraulic support mechanism is arranged at the front and rear ends of the support frame, including four horizontal telescopic arms and four support legs, and the horizontal telescopic arms are arranged laterally, including at least one level of horizontal telescopic arms and used to control the horizontal telescopic arms The telescopic second hydraulic jack, the supporting leg is located at the outer end of the horizontal telescopic arm, mainly composed of a vertical jack, and the supporting leg is supported on the ground when the vertical jack is stretched out;

The head unit and the tail unit are respectively connected to the front-end platform and the rear-end platform. Both the head unit and the tail unit are equipped with traveling mechanisms. The power system that powers the action of the mechanism and the control system that controls the action of the power system.

Beneficial effects: when the central lifting type unit support truck is used, the second hydraulic jack is driven to make the horizontal telescopic arm stretch out, and the vertical jack is controlled to make the outer support leg of the hydraulic support mechanism stretch out downward to support the ground, increasing the For equipment support strength and stability, adjust the inclination angle of the lifting arm by controlling the luffing jack to make it tilt to the side of the unit support, control the extension of the lifting arm and hook the unit support through the lifting structure at the top, and adjust the lifting arm again The tilt angle and the telescopic length of the lifting arm move the unit bracket to the bracket carrier in the middle of the truck; retract the hydraulic support mechanism, and realize the transfer of the unit bracket in the roadway through the traveling mechanism on the head unit and tail unit. To sum up, it can be found that the utility model adopts the central lifting and loading mechanism to realize the lifting of the unit bracket, avoiding complicated structure, low processing cost, easier realization and maintenance, reliable and durable, this kind of lifting method is easy to operate, and the force point is located on the vehicle In the middle, there is no need for additional counterweight. After hoisting, the unit bracket is supported on the ship-shaped frame and transported with the vehicle. The hoisting and loading mechanism in the middle can maintain a non-working state and consume less energy; compared with the supporting leg mechanism in the prior art , the hydraulic support mechanism in the utility model is mainly composed of a horizontal telescopic arm and a support leg to form a vertical cantilever support structure, the support point is located in the middle of the vehicle, the support force and structural stability are greatly improved, and the horizontal telescopic arm stretches out when in use , the support span of the equipment bearing surface is large, the support arm is long, the overall support strength of the vehicle is high, and the stability is good. During the driving process, the hydraulic support mechanism is retracted, and the central lifting and loading mechanism is shrunk, away from the ground and the top of the roadway, reducing the external size of the equipment. Improve driving passability and safety.

Further, the walking mechanism is mainly composed of a crawler structure, which includes a walking hydraulic motor, a driving wheel, a tension wheel, a load-bearing wheel, a hydraulic tensioning mechanism and an alloy track, and the crawler structure is respectively connected through the front The structure and the rear connection structure are connected with the front-end platform and the back-end platform.

Beneficial effects: the crawler structure can adapt to various complex road conditions and harsh working conditions in coal mines, and has strong ability to climb slopes and overcome obstacles.

Further, a hydraulic turntable is provided between the front connecting structure and the front-end platform, and the hydraulic turntable is used to drive the traveling mechanism to turn when driven by the power system.

Beneficial effects: the combination of the hydraulic turntable and the crawler structure can realize in-situ steering, thereby adapting to a smaller turning radius and improving equipment passability.

Further, the front connection structure and the rear connection structure include a base and an adjustable support mounted on the base, the base is connected to the running gear, the adjustable support is connected to the front platform or the rear platform, and the base is provided with at least two The level is connected to the height adjustment hole of the adjustable support through the pin shaft.

Beneficial effects: the height adjustment hole on the base can be used to adjust the height of the adjustable support and even the boat-shaped frame relative to the ground, and the body can be raised/lowered through the pin shaft to ensure the stability of the vehicle's load. When necessary, adjust the boat-shaped frame The ground clearance enables the vehicle to have better adaptability to road conditions and ability to overcome obstacles.

Further, the power system includes a vehicle-mounted gear pump, a pump motor, a fuel tank and hydraulic pipelines, and the pump motor is connected to an external power source through a power supply cable.

Beneficial effects: the hydraulic power system is different from the diesel internal combustion engine power assembly used in the unit support truck in the prior art, and has small size, low cost, no tail gas emission pollution, good environmental protection performance, and is more suitable for high gas mines It is safe to use.

Further, the head unit also includes a cable take-up mechanism, which is mainly composed of a cable take-up drum, a drum hydraulic motor and a cable carrier, and is used to receive and unwind the power supply cable driven by the power system.

Beneficial effects: the retracting mechanism can automatically retract and retract the power supply cable during the movement of the vehicle body, so that the length of the power supply cable matches the driving distance of the vehicle, saves manual dragging steps, and saves manpower and material resources.

Further, the support frame is a frame structure mainly composed of I-beams and channel steels.

Beneficial effects: the frame structure takes into account both the lightweight design and the overall structural strength, and is not easy to accumulate coal, and the floating coal carried during the lifting of the unit support can leak down through the gap on the frame structure.

Further, multiple bubble levels are provided on the head unit and the tail unit.

Beneficial effects: the bubble level instrument can be used to calibrate the support state level of the hydraulic support mechanism to ensure the stability of the support of the hydraulic support mechanism.

Further, the supporting leg also includes a supporting shoe plate located at the bottom of the vertical jack.

Beneficial effects: the contact between the supporting legs and the ground is increased, the supporting area is increased, and the firmness of the supporting is improved.

Description of drawings

Fig. 1 is a structural schematic view from a side view of a specific embodiment 1 of a mid-mounted lifting type unit support carrier truck of the present invention;

Fig. 2 is a three-dimensional structural schematic diagram of a specific embodiment 1 of a central lifting type unit support carrier truck of the present invention;

Fig. 3 is a structural schematic view of a top-side perspective of a specific embodiment 1 of a mid-mounted lifting type unit support carrier truck of the present invention;

Fig. 4 is a structural schematic diagram of the middle lifting load-carrying unit of the specific embodiment 1 of a middle lifting type unit support carrier truck of the present invention;

Fig. 5 is a structural schematic view of the middle hoisting load bearing unit in Fig. 4 from a front perspective;

Fig. 6 is a schematic diagram of the walking mechanism and the front connection structure of the head unit in the specific embodiment 1 of a mid-mounted lifting type unit bracket carrier truck of the present invention;

Fig. 7 is a schematic diagram of the traveling mechanism and the front connection structure of the head unit in the specific embodiment 1 of a centrally mounted lifting type unit bracket carrier truck of the present invention in another perspective;

Fig. 8 is a schematic diagram of the walking mechanism and the rear connection structure in the tail unit in the specific embodiment 1 of a mid-mounted lifting type unit bracket carrier truck of the present invention;

Fig. 9 is a schematic diagram of the walking mechanism and the rear connection structure in the tail unit of the specific embodiment 1 of a centrally mounted lifting type unit support truck of the present invention in another perspective;

Fig. 10 is a structural schematic diagram of the cable take-up mechanism in the specific embodiment 1 of a mid-mounted lifting type unit support carrier truck of the present invention;

Fig. 11 is a structural schematic diagram of the control system in the specific embodiment 1 of a mid-mounted lifting type unit support carrier truck of the present invention;

Fig. 12 is a schematic diagram of the working state of the specific embodiment 1 of a mid-mounted lifting type unit bracket carrier truck of the present invention;

Fig. 13 is a schematic diagram of the working state of the specific embodiment 1 of a mid-mounted lifting type unit support truck of the present invention at another angle;

Reference signs: 100-head unit; 200-middle lifting load-bearing unit; 300-tail unit;

1-boat frame; 1.1-front-end platform; 1.2-support frame; 1.3-rear-end platform;

2- Central lifting and loading mechanism; 2.1- Lifting arm; 2.2- Connecting mechanism; 2.3- Luffing jack; 2.4- Hoisting ring chain and spreader;

3-hydraulic support mechanism; 3.1-first-level horizontal telescopic arm; 3.2-secondary horizontal telescopic arm; 3.3-vertical jack; 3.4-support shoe plate; 3.5-inner arm;

4-traveling mechanism; 4.1-crawler structure; 4.1.1-traveling hydraulic motor; 4.1.2-driving wheel; 4.1.3-tensioning wheel; 4.1.4-bearing wheel; 4.1.5-hydraulic tensioning mechanism; 4.1.6-alloy track; 4.2-front connection structure; 4.3-rear connection structure; 4.4-hydraulic turntable;

5-Cable receiving mechanism; 5.1-Cable drum; 5.2-Cable rack; 5.3-Roller hydraulic motor; 5.4-Junction box of cable rolling device;

6.1-Vehicle gear pump; 6.2-Pump motor; 6.3-Radiator; 6.4-Oil tank;

7.1-Manual electro-hydraulic control valve group; 7.2-Synchronous distribution valve group; 7.3-Power starter switch; 7.4-Control power box; 7.5-Remote control;

8-sound and light integrated lamp; 9-working searchlight; 10-head unit shield; 11-tail unit shield; 12-bubble level; 13-unit bracket; 14-ground.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

A specific embodiment 1 of a mid-mounted lifting type unit bracket carrier truck of the present utility model:

The overall structure of the mid-mounted lifting unit support truck is shown in Figure 1-3. It includes a head unit 100, a middle lifting load-bearing unit 200, and a tail unit 300 from front to back. The middle lifting load-bearing unit 200 is mainly composed of a boat-shaped frame. 1. It consists of a central lifting and loading mechanism 2 and a hydraulic support mechanism 3. The specific structure of the boat-shaped frame 1 is shown in Figure 4-5. The overall shape is "concave", with two ends high and the middle low. The boat-shaped frame 1 includes a bracket carrier 1.2 for supporting the unit bracket 13 in the middle and a front-end platform at both ends. 1.1, back-end platform 1.3. The central lifting and loading mechanism 2 is located at the front and rear ends of the support frame 1.2, and the central lifting and loading mechanism 2 includes two lifting arms 2.1, two connecting mechanisms 2.2, four luffing jacks 2.3, and a lifting structure located at the top of the lifting arm 2.1 , the hoisting structure in the present embodiment is hoisting ring chain and suspender 2.4. The two lifting arms 2.1 are symmetrically arranged at the front and rear ends of the support frame 1.2, and the left and right sides of the lifting arm 2.1 are respectively provided with luffing jacks 2.3. The lifting arm 2.1 is mainly composed of a bottom arm, a vertical telescopic arm, and a first hydraulic jack. Composition, the first hydraulic jack is located between the bottom arm and the vertical telescopic arm, and adjusts the overall length of the lifting arm 2.1 when telescopic. The lower ends of the lifting arm 2.1 and the luffing jack 2.3 are respectively rotatably connected with the support frame 1.2, and the upper ends of the lifting arm 2.1 and the luffing jack 2.3 are respectively rotatably connected with the connection mechanism 2.2, and the lifting arm 2.1 is changed in inclination angle by controlling the expansion and contraction of each luffing jack 2.3 .

The hydraulic support mechanism 3 is arranged at the front and rear ends of the support frame 1.2, and is set close to the lifting and loading mechanism 2, and includes four horizontal telescopic arms and four support legs, wherein the horizontal telescopic arms can extend laterally, including the inner arm located on the inner side 3.5 and a two-stage horizontal telescopic arm that can be extended step by step along the inner arm 3.5. The two-stage horizontal telescopic arms are respectively a primary horizontal telescopic arm 3.1 and a secondary horizontal telescopic arm 3.2. The telescopic arm extends/retracts the second hydraulic jack in turn. The support leg is positioned at the outer end of the secondary horizontal telescopic arm 3.2, and the support leg includes a vertical jack 3.3 and a support shoe 3.4 positioned at the bottom of the vertical jack 3.3. When the hydraulic support mechanism 3 is in use, the horizontal telescopic arm is stretched out and The supporting legs stretch out downwards, and the supporting shoe plate 3.4 is supported on the ground.

The head unit 100 and the tail unit 300 are respectively connected to the front-end platform 1.1 and the rear-end platform 1.3, and the lower sides of the head unit 100 and the tail unit 300 are provided with running mechanisms, as shown in Figure 6-9, the running mechanism in this embodiment mainly It is composed of crawler structure 4.1, which includes walking hydraulic motor 4.1.1, driving wheel 4.1.2, tensioning wheel 4.1.3, load wheel 4.1.4, hydraulic tensioning mechanism 4.1.5 and alloy track 4.1. 6. The front and rear running mechanisms are respectively connected to the front platform 1.1 and the rear platform 1.3 through the front connection structure 4.2 and the rear connection structure 4.3. The structure of the front connection structure 4.2 and the rear connection structure 4.3 are similar, both including the base and the adjustable support installed on the base. There are two levels of height adjustment holes on the base. The adjustable support is used to connect with the front platform 1.1 or the rear platform 1.3 is connected, the base is connected to the crawler structure 4.1, the adjustable support is fixed on the base through the pin shaft, and the distance between the adjustable support and even the boat frame relative to the ground can be adjusted by switching the height adjustment hole. In order to realize the steering function, as shown in Fig. 6 and Fig. 7, a hydraulic turntable 4.4 is also provided between the front connecting structure 4.2 and the front-end platform 1.1, which can drive the front-end traveling mechanism to turn under the action of hydraulic drive.

The head unit 100 also includes a retracting mechanism 5 and a power system positioned on the front-end platform 1.1, and a protective head unit shield 10 is provided outside the retracting mechanism 5 and the power system, and the tail unit 300 includes a The control system on 1.3 is provided with a tail unit shield 11 outside the control system. As shown in Figure 10, the power system includes a vehicle-mounted gear pump 6.1, a pump motor 6.2, a radiator 6.3, a fuel tank 6.4, and hydraulic pipelines. The pump motor 6.2 is powered by a power supply cable to drive the vehicle-mounted gear pump 6.1 to work. The middle lifting and loading mechanism 2, the hydraulic support mechanism 3, the crawler structure 4.1, and the hydraulic turntable 4.4 provide hydraulic power. The take-up mechanism 5 is mainly composed of a cable winding drum 5.1, a cable carrier 5.2, a drum hydraulic motor 5.3, a cable winding device junction box 5.4 and a transmission part, wherein the drum hydraulic motor 5.3 is rotated by the power system to retract and release the power supply cable, so that the power supply The length of the cable matches the driving distance of the vehicle, eliminating the need for manual dragging.

In the utility model, the support frame 1.2 is a frame structure mainly composed of I-shaped steel and channel steel. This structure not only meets the requirements of high strength and light weight, but also is not easy to accumulate coal, and it is not easy to drop during the lifting and transfer of the unit support. The coal is not easy to accumulate on the support carrier frame 1.2. The control system in the tail unit 300 is a remote control system, as shown in Figure 11, mainly composed of a manual-automatic electro-hydraulic control valve group 7.1, a synchronous distribution valve group 7.2, a power starter switch 7.3, a control power box 7.4 and a remote controller 7.5 Composition, this kind of control system can not only realize manual operation but also can accept the remote control signal for remote control operation, and can also be connected to the mine ring network through wireless communication, which can realize the video monitoring operation of the remote centralized control warehouse in the mine and the remote control of the dispatching center in the mine. The operator can indirectly or directly control the action of the power system, central lifting and loading mechanism 2, hydraulic support mechanism 3, crawler structure 4.1, hydraulic turntable 4.4, and retracting mechanism 5 through the control system.

The process of using the utility model to lift and transfer the unit support is as follows: as shown in Figure 12-13, the remote controller controls the first-level horizontal telescopic arm 3.1 and the second-level horizontal telescopic arm 3.2 to extend outward through the remote control system, and the hydraulic support mechanism The upper support leg extends downwards to support the ground 14, and the luffing jack 2.3 is controlled to extend/shorten, so that the lifting arm 2.1 is inclined to the unit support 13, and the lifting arm 2.1 is extended to make the hoisting ring chain on the top and the sling 2.4 hook Hold the unit support 13, and then operate the luffing jack 2.3 and the lifting arm 2.1 to hoist the unit support 13 to the support frame 1.2 in the middle of the transport vehicle, retract the hydraulic support mechanism, and the movement of the transport vehicle can be realized through the crawler structure. Transport function. In this embodiment, the head unit shield 10 and the tail unit shield 11 are provided with a plurality of air bubble levels 12 for correcting the state level of the hydraulic support mechanism.

Based on the above process, the utility model has the following advantages:

1) The utility model uses a central lifting and loading mechanism to lift the unit bracket, which has a simple structure, low processing cost, easier maintenance and manufacture, and better durability.

2) The lifting force point of this lifting method is located in the middle of the vehicle, and no additional counterweight structure is required.

3) The central lifting and loading mechanism only needs to lift the unit bracket to the ship-shaped frame during the process, and it does not need to maintain the working state during the subsequent transfer process. , the device consumes less energy.

4) The hydraulic support mechanism is a vertical cantilever support structure. When in use, the support span of the equipment bearing surface and the length of the support arm are increased, and the support stability is good.

5) The hydraulic support mechanism can be retracted to the boat-shaped frame after use, and the central lifting and loading mechanism can be retracted to reduce the width and height of the vehicle, thereby improving driving passability and safety.

6) Since the power supply mode of the unit support handling equipment in the prior art is an internal combustion diesel engine, the diesel engine provides kinetic energy through internal compression of diesel combustion, and there is a certain risk when used in gas outburst mines and high gas mines. The diesel engine is large in size and emits harmful gases when burned , pollute the fresh air flow underground, which will affect the breathing and physical health of the working face staff, and the price is also very expensive, and the overall cost of the handling equipment is relatively high; the utility model uses a power supply cable to supply power to the vehicle-mounted gear pump, and each mechanism (middle lifting and loading Mechanism, hydraulic supporting mechanism, retracting mechanism, walking mechanism) are all supplied with hydraulic oil by the vehicle-mounted gear pump. The equipment has good explosion-proof performance, not only small in size, low in cost, but also has excellent environmental protection performance. It is powered by cables and does not produce any pollution. Gas, more suitable for use in high gas mines.

7) The remote control method is more intelligent and safe, reducing the personal safety risk of operators.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (9)

1. A middle lifting type unit support carrier is characterized by comprising a head unit, a middle lifting bearing unit and a tail unit which are arranged from front to back respectively, wherein the middle lifting bearing unit comprises a ship-shaped frame, a middle lifting loading mechanism and a hydraulic support mechanism, the middle lifting loading mechanism and the hydraulic support mechanism are arranged on the ship-shaped frame, the two ends of the ship-shaped frame are high, the middle of the ship-shaped frame is low, and the ship-shaped frame comprises a middle support bearing frame, and a front end platform and a rear end platform which are positioned at the two ends of the ship-shaped frame; the middle hoisting and loading mechanism is positioned at the front end and the rear end of the support bearing frame and comprises two hoisting arms, four amplitude-variable jacks, two connecting mechanisms and a hoisting structure positioned at the top ends of the hoisting arms, the two hoisting arms are symmetrically arranged at the front end and the rear end of the support bearing frame, the amplitude-variable jacks are positioned at the left side and the right side of the hoisting arms, first hydraulic jacks for stretching are arranged in the hoisting arms, the lower ends of the hoisting arms and the amplitude-variable jacks are respectively and rotatably connected with the support bearing frame, and the upper ends of the hoisting arms and the amplitude-variable jacks are respectively and rotatably connected with the connecting mechanisms; the hydraulic support mechanisms are arranged at the front end and the rear end of the support bearing frame and comprise four transverse telescopic arms and four support legs, the transverse telescopic arms are transversely arranged and comprise at least one stage of transverse telescopic arm and a second hydraulic jack for controlling the transverse telescopic arms to stretch, the support legs are positioned at the outer ends of the transverse telescopic arms and mainly comprise vertical jacks, and the support legs are supported on the ground when the vertical jacks stretch out;

the head unit and the tail unit are respectively connected with the front end platform and the rear end platform, the head unit and the tail unit are respectively provided with a travelling mechanism, and the head unit and the tail unit are respectively provided with a power system and a control system, wherein the power system is used for providing power for the travelling mechanism, the hydraulic supporting mechanism and the middle hoisting and loading mechanism, and the control system is used for controlling the power system to act.

2. The carrier for transporting a centrally-mounted lifting unit frame as claimed in claim 1, wherein the traveling mechanism is mainly formed of a crawler-type structure, the crawler-type structure includes a traveling hydraulic motor, a driving wheel, a tension wheel, a bearing wheel, a hydraulic tension mechanism and an alloy crawler, and the crawler-type structure is connected to the front end platform and the rear end platform through a front connecting structure and a rear connecting structure, respectively.

3. The carrier for transporting a centrally-mounted lifting type unit frame as claimed in claim 2, wherein a hydraulic turntable is provided between the front connection structure and the front platform, and the hydraulic turntable is driven by a power system to drive the traveling mechanism to turn.

4. The carrier as claimed in claim 2 or 3, wherein the front and rear connection structures comprise a base and an adjustable support installed on the base, the base is connected to the traveling mechanism, the adjustable support is connected to the front or rear platform, and at least two stages of height adjustment holes are formed in the base and connected to the adjustable support through a pin.

5. The middle-lift type unit rack truck as claimed in claim 1, 2 or 3, wherein the power system comprises an on-board gear pump, a pump motor, an oil tank and a hydraulic line, and the pump motor is connected with an external power source through a power supply cable.

6. The middle-lift type unit rack truck as claimed in claim 5, wherein the head unit or the tail unit further comprises a cable retracting mechanism, which is mainly composed of a cable drum, a drum hydraulic motor and a cable support rack, for retracting the power supply cable driven by the power system.

7. The carrier of claim 1, 2, 3 or 6, wherein said carrier frame is a frame structure mainly composed of i-steel and channel steel.

8. The carrier for transporting a centrally installed suspended type unit frame as claimed in claim 1, 2, 3 or 6, wherein a plurality of bubble levels are provided on the head unit and the tail unit.

9. The mid-set lifting type unit rack truck as claimed in claim 1, 2, 3 or 6, wherein said support leg further comprises a support shoe plate at the bottom of the vertical jack.

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