Single-cylinder pin-control system and crane

Abstract

Disclosed are a single-cylinder pin-control system and a crane. The single-cylinder pin-control system comprises a power unit (13), a pin mechanism (15), and a telescopic cylinder (17), wherein the power unit (13) comprises an electric motor (131), a hydraulic pump (133), and a control valve group, the electric motor (131) being connected to the hydraulic pump (133) so as to drive the hydraulic pump (133), the hydraulic pump (133) being connected to the control valve group to supply oil to the pin mechanism (15) by means of the control valve group so as to realize pin insertion and extraction, and the power unit (13) being arranged on an outer side wall of the telescopic cylinder (17). According to the single-cylinder pin-control system and the crane, the machining difficulty of the cylinder can be greatly reduced, the consumption of the low-temperature oil is low, the cost is low, and the problems of pin ejection, core tube instability and automatic forward extension of the telescopic cylinder caused by volume change of the core tube are prevented. The flow of the system can be reduced, such that the hydraulic pump is small in size, and light in terms of weight.

Description

Single cylinder latch control system and crane

[0001] This application claims priority to Chinese patent application No. 202311736065.8, filed on December 15, 2023, entitled “Single-cylinder latch control system and crane,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of lifting machinery, and in particular to a single-cylinder latch control system and a crane. Background Art

[0003] Most multi-arm cranes use a single-cylinder latch-type telescopic mechanism, which realizes the telescopic function of the boom through the cooperation of the telescopic cylinder, cylinder pin, arm pin, and a cylinder-arm pin drive mechanism with a cylinder pin cylinder and an arm pin cylinder. Among them, the cylinder pin cylinder drives the cylinder pin to plug and pull out to control the locking or separation of the telescopic part of the telescopic cylinder and the boom section of the boom, and the arm pin cylinder drives the arm pin to plug and pull out to control the locking or separation of two adjacent boom sections. When a boom section needs to be extended, the cylinder pin cylinder first drives the cylinder pin to move to lock the telescopic cylinder and the boom section, and then the arm pin cylinder drives the arm pin to move to release the lock between the boom section and the previous boom section, and the boom section is then extended and retracted to the target position with the telescopic cylinder; then the arm pin is driven by the arm pin cylinder to move to lock the boom section and the previous boom section to the target position, and then the cylinder pin cylinder drives the cylinder pin to move to release the lock between the telescopic cylinder and the boom section, and so on to realize the telescopic function. Technical issues

[0004] Referring to Figure 1, a single-cylinder latch control system is illustrated. The pressurized oil source passes through a first reversing valve 91 to the central channel 92 of the telescopic cylinder. The oil then flows through the central channel 92 to the second reversing valve 94 and the third reversing valve 95 located outside the telescopic cylinder barrel. The reversing control of the second reversing valve 94 or the third reversing valve 95 respectively achieves the pulling action of the cylinder pin or arm pin. Referring to Figures 2 and 3, the central channel 92 is formed in a core tube 98 within a telescopic cylinder 97. The oil flows from the core tube 98 at the rod tip of the piston rod of the telescopic cylinder 97, through the core tube 98 of the telescopic cylinder 97, to the fixed oil pipe outside the cylinder barrel of the telescopic cylinder 97, then to the second reversing valve 94 or the third reversing valve 95, and finally to the latch mechanism 99, thereby achieving control of the cylinder pin or arm pin. However, during the extension and retraction process of the telescopic cylinder 97, the length of the core tube 98 is constantly changing, and the core tube 98 itself is equivalent to a small oil cylinder. When the telescopic cylinder 97 is fully extended, the volume of the core tube 98 itself is the largest, and when the telescopic cylinder 97 is fully retracted, the volume of the core tube 98 itself is the smallest. Therefore, the amount of oil passing through this channel also needs to consider the volume change of the center channel 92 itself. When the telescopic cylinder is extended, if the oil supply flow of the center channel is less than the volume value generated by the cylinder pulling up, the pressure in the center channel 92 will decrease or even a vacuum will appear, causing the pin to pop out, the extension and retraction to be interrupted or even an accident to occur; in addition, when the telescopic cylinder 97 retracts, the pressure oil in the core tube 98 is squeezed out, and if the oil is not drained smoothly, the core tube 98 will be damaged; in addition, when the telescopic cylinder 97 retracts from the fully extended state, the core tube 98 is relatively long, and it is a slender rod, which can easily cause the core tube 98 pressure rod to become unstable during the retraction process of the cylinder, and the core tube to bend and be damaged; because the cylinder pin and the arm pin are single-acting cylinders with a small volume, the oil in the telescopic channel is close to the dead cavity when the pin is pulled out; When the temperature is low in winter, the hydraulic oil tank is preheated and other actions of the main system can be operated. However, the central channel 92 of the telescopic cylinder 97 cannot be preheated because it is close to the dead chamber, resulting in the inability to pull out the pin, and thus the telescopic operation cannot be performed. The central channel 92 cannot exchange the oil drain, and the entire telescopic operation cannot be performed. Therefore, only low-temperature hydraulic oil can be used in winter, which is costly. In addition, since the core tube 98 itself has a thickness, when pressure is built up in the central channel 92, the pressure will act on the end of the core tube 98 of the central channel 92, generating a force to extend the central channel 92 of the telescopic cylinder 97, driving the telescopic cylinder 97 to extend forward, resulting in malfunction. Technical Solutions

[0005] The purpose of the present invention is to provide a single-cylinder latch control system and a crane to avoid the problem of the pin being ejected and damaged due to the change in the core tube's own volume, the problem of the core tube being easily unstable, the problem of a dead cavity being created that makes it impossible to pull out the pin, and the problem of the telescopic cylinder automatically extending forward.

[0006] The present invention provides a single-cylinder latch control system, comprising a power unit, a latch mechanism and a telescopic oil cylinder. The power unit comprises a motor, a hydraulic pump and a control valve group. The motor is connected to the hydraulic pump to drive the hydraulic pump. The hydraulic pump is connected to the control valve group to supply oil to the latch mechanism through the control valve group to achieve the insertion and extraction of the pin. The power unit is arranged on the outer side wall of the telescopic oil cylinder.

[0007] In one embodiment, the single-cylinder latch control system further includes a cable reel, a first cable for energizing the motor is connected to the motor via the cable reel, and a second cable for energizing the control valve group is connected to the control valve group via the cable reel.

[0008] In one embodiment, the power unit further includes a power battery, and the power battery is connected to the motor.

[0009] In one embodiment, the single-cylinder latch control system further includes a cable reel, the power unit further includes a power battery, the motor is powered by a first cable and the power battery, the first cable for energizing the motor is connected to the motor through the cable reel, and the second cable for energizing the control valve group is connected to the control valve group through the cable reel.

[0010] In one embodiment, the telescopic cylinder includes a cylinder barrel and a piston, the piston is movably arranged in the cylinder barrel relative to the cylinder barrel, the power unit is arranged on the outer side wall of the cylinder barrel of the telescopic cylinder, and the power unit is arranged adjacent to the latch mechanism.

[0011] In one embodiment, the latch mechanism includes an arm pin cylinder and a cylinder pin cylinder, and both the arm pin cylinder and the cylinder pin cylinder are installed on the outer side wall of the cylinder barrel of the telescopic cylinder.

[0012] In one embodiment, the power unit is disposed adjacent to the latch mechanism.

[0013] In one embodiment, the oil supply device is further included, and the hydraulic pump is connected to the oil supply device so that the oil supply device supplies oil to the hydraulic pump; the power unit also includes an oil supply circuit and an oil return circuit, one end of the oil supply circuit is connected to the oil outlet of the hydraulic pump, and the other end is connected to the control valve group, and one end of the oil return circuit is connected to the oil supply device, and the other end is connected to the control valve group.

[0014] In one embodiment, the control valve group includes a first reversing valve, a second reversing valve and a third reversing valve, the first reversing valve is connected to the hydraulic pump, the second reversing valve and the third reversing valve are respectively connected to the first reversing valve, the latch mechanism includes an arm pin cylinder, a cylinder pin cylinder, an arm pin and a cylinder pin, the arm pin cylinder and the cylinder pin cylinder are used to drive the arm pin and the cylinder pin to extend and retract respectively; the first reversing valve includes a first oil port, a second oil port and a third oil port, the first oil port is connected to the oil supply oil circuit, the second oil port is connected to the oil return oil circuit, and the third oil port is respectively connected to the second reversing valve and the third reversing valve, the first reversing valve includes a first position and a second position, in the first position, the first oil port and the third oil port are connected, and the first oil port and the third oil port are both disconnected from the second oil port, in the first position When in the second position, the first oil port, the second oil port and the third oil port are all connected; the second reversing valve includes a fourth oil port and a fifth oil port, the fourth oil port is connected to the first reversing valve, and the fifth oil port is connected to the oil chamber of the arm pin cylinder of the latch mechanism, the second reversing valve includes a third position and a fourth position, when in the third position, the fourth oil port and the fifth oil port are connected, and when in the fourth position, the fourth oil port and the fifth oil port are disconnected; the third reversing valve includes a sixth oil port and a seventh oil port, the sixth oil port is connected to the first reversing valve, and the seventh oil port is connected to the oil chamber of the cylinder pin cylinder of the latch mechanism, the third reversing valve includes a fifth position and a sixth position, when in the fifth position, the sixth oil port and the seventh oil port are connected, and when in the sixth position, the sixth oil port and the seventh oil port are disconnected.

[0015] In one embodiment, the latch mechanism includes an arm pin cylinder, a cylinder pin cylinder, an arm pin and a cylinder pin, and the arm pin cylinder and the cylinder pin cylinder are used to respectively drive the arm pin and the cylinder pin to extend and retract; the power unit includes two motors and two hydraulic pumps, and the control valve group includes two first reversing valves, one motor, one hydraulic pump, and one first reversing valve form a group to supply oil to the arm pin cylinder, and another motor, another hydraulic pump, and another first reversing valve form a group to supply oil to the cylinder pin cylinder, and the first reversing valve is used to connect or disconnect the hydraulic pump with the corresponding arm pin cylinder or the cylinder pin cylinder.

[0016] In one embodiment, the oil supply device is an oil tank or an accumulator.

[0017] In one embodiment, the hydraulic oil in the power unit and the latch mechanism is low-temperature hydraulic oil.

[0018] In one embodiment, the motor is a high-speed motor, and the hydraulic pump is a high-speed main pump.

[0019] The present invention also provides a crane comprising the above-mentioned single-cylinder latch control system.

[0020] In one embodiment, the crane includes an integrated hydraulic pump, an integrated motor, and an integrated power supply. The integrated power supply supplies power to the integrated motor and the motor, and the integrated motor drives the integrated hydraulic pump to operate. Beneficial effects

[0021] In the single-cylinder latch control system and crane of the embodiments of the present invention, since the power unit is arranged outside the telescopic cylinder, there is no need to provide a center channel on the telescopic cylinder, which can greatly reduce the difficulty of cylinder processing; the system uses less oil, and even if low-temperature oil is used, the cost is low; the omission of the center channel can also lead to the omission of the core tube, thereby avoiding the problems of pin ejection, core tube instability, and automatic extension of the telescopic cylinder caused by the change in the core tube's own volume; in addition, since there is no need to consider the increase in flow caused by the increase in the core tube volume when the telescopic cylinder is extended, the system flow can be reduced, making the hydraulic pump smaller in size and lighter in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] FIG1 is a schematic structural diagram of a single-cylinder latch control system.

[0024] FIG2 is a state diagram of the telescopic oil cylinder of the single-cylinder latch control system shown in FIG1 when it is retracted.

[0025] FIG3 is a state diagram of the telescopic oil cylinder of the single-cylinder latch control system shown in FIG1 when it is extended.

[0026] FIG4 is a schematic structural diagram of a single-cylinder latch control system according to a first embodiment of the present invention.

[0027] FIG5 is a partial structural diagram of the single-cylinder latch control system shown in FIG4 .

[0028] FIG6 is a schematic diagram of a detailed structure of the single-cylinder latch control system shown in FIG5 .

[0029] FIG. 7 is a schematic structural diagram of a single-cylinder latch control system according to a second embodiment of the present invention.

[0030] FIG8 is a schematic structural diagram of a single-cylinder latch control system according to a third embodiment of the present invention.

[0031] FIG9 is a schematic structural diagram of a single-cylinder latch control system according to a fourth embodiment of the present invention.

[0032] FIG. 10 is a schematic structural diagram of a single-cylinder latch control system according to a fifth embodiment of the present invention.

[0033] FIG. 11 is a schematic structural diagram of a single-cylinder latch control system according to a sixth embodiment of the present invention. Modes for Carrying Out the Invention

[0034] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0035] Unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0036] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0037] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0038] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0039] First embodiment

[0040] Referring to Figure 4 , the single-cylinder latch control system of the first embodiment of the present invention includes a cable reel 11, a power unit 13, a latch mechanism 15, and a telescopic cylinder 17. Referring also to Figures 5 and 6 , the power unit 13 includes a motor 131, a hydraulic pump 133, and a control valve assembly. The motor 131 is connected to the hydraulic pump 133 to drive the hydraulic pump 133, which in turn is connected to the control valve assembly to supply oil to the latch mechanism 15 through the control valve assembly to insert and remove the pin. The power unit 13 is mounted on the outer wall of the telescopic cylinder 17. A first cable, which energizes the motor 131, is connected to the motor 131 via the cable reel 11. A second cable, which energizes the control valve assembly, is connected to the control valve assembly via the cable reel 11.

[0041] In the single-cylinder latch control system of this embodiment, since the power unit is located outside the telescopic cylinder, there is no need for a central channel on the cylinder, significantly reducing the cylinder's manufacturing complexity. The system uses less oil, making low-temperature oil a cost-effective option, while the rest of the crane does not require low-temperature hydraulic oil. The omission of the central channel also eliminates the need for a core tube, thus avoiding issues such as pin ejection, core tube instability, and automatic extension of the telescopic cylinder caused by changes in the core tube's volume. Furthermore, since there is no need to consider the increased flow rate caused by the increased core tube volume during extension, the system flow rate can be reduced, resulting in a smaller and lighter hydraulic pump. For example, in a system with a central channel, the hydraulic pump flow rate is generally around 40 to 80 L / min. However, the flow rate during pin extraction is actually very low, with the combined volume of the entire cylinder pin or arm pin set typically less than 0.3 L. In the system of this embodiment, which eliminates the central channel, the hydraulic pump flow rate can be significantly reduced. For example, for a pin extraction time of 2 seconds, the hydraulic pump flow rate is 0.3 L / 2 seconds = 9 L / min.

[0042] In this embodiment, the control valve group includes a first reversing valve 135, a second reversing valve 136 and a third reversing valve 137. The first reversing valve 135 is connected to the hydraulic pump 133, the second reversing valve 136 and the third reversing valve 137 are respectively connected to the first reversing valve 135, and the second reversing valve 136 and the third reversing valve 137 are respectively connected to the latch mechanism 15.

[0043] In this embodiment, the first cable connected to the motor 131 and the second cable connected to the first reversing valve 135, the second reversing valve 136, and the third reversing valve 137 are all wound around the cable reel 11. Specifically, the first cable connected to the motor 131 and the second cable connected to the first reversing valve 135, the second reversing valve 136, and the third reversing valve 137 are all connected to a power supply (not shown). It can be understood that the first cable that energizes the motor 131 does not have to be wound around the cable reel 11, and the second cable that energizes the control valve group does not have to be wound around the cable reel 11. The cable reel 11 mainly serves the function of winding to avoid the cables being too messy. For the single-cylinder latch control system, the cable reel 11 already exists, and the cable that energizes the motor 131 is also wound around the cable reel 11. There is no need to add new components, which is simple and easy.

[0044] Specifically, the first cable and the second cable can be integrated into one body and wound together on the cable reel 11. Of course, the first cable and the second cable can also be wound on the cable reel 11 independently and pulled out or retracted in parallel.

[0045] In this embodiment, the power unit 13 further includes an oil tank 139 , and the hydraulic pump 133 is connected to the oil tank 139 so that the oil tank 139 supplies oil to the hydraulic pump 133 .

[0046] In this embodiment, the power unit 13 further includes a relief valve 141 , which is connected to the oil tank 139 and the oil outlet of the hydraulic pump 133 to achieve overflow.

[0047] In this embodiment, the power unit 13 further includes an oil supply line 143 and an oil return line 144. One end of the oil supply line 143 is connected to the oil outlet of the hydraulic pump 133 and the other end is connected to the control valve assembly. The oil return line 144 is connected to the oil tank 139 at one end and to the control valve assembly at the other end. The first reversing valve 135 includes a first oil port 1351, a second oil port 1352, and a third oil port 1353. The first oil port 1351 is connected to the oil supply line 143, the second oil port 1352 is connected to the oil return line 144, and the third oil port 1353 is connected to the second reversing valve 136 and the third reversing valve 137, respectively. The first reversing valve 135 includes a first position and a second position. In the first position, the first oil port 1351 and the third oil port 1353 are connected, and the first oil port 1351 and the third oil port 1353 are disconnected from the second oil port 1352. In the second position, the first oil port 1351, the second oil port 1352 and the third oil port 1353 are all connected.

[0048] Specifically, the second reversing valve 136 includes a fourth oil port 1361 and a fifth oil port 1362. The fourth oil port 1361 is connected to the first reversing valve 135, and the fifth oil port 1362 is connected to the oil chamber of the arm pin cylinder 151 of the latch mechanism 15. The second reversing valve 136 includes a third position and a fourth position. When in the third position, the fourth oil port 1361 and the fifth oil port 1362 are connected. When in the fourth position, the fourth oil port 1361 and the fifth oil port 1362 are disconnected. The third reversing valve 137 includes a sixth oil port 1371 and a seventh oil port 1372. The sixth oil port 1371 is connected to the first reversing valve 135, and the seventh oil port 1372 is connected to the oil chamber of the cylinder pin cylinder 153 of the latch mechanism 15. The third reversing valve 137 includes a fifth position and a sixth position. When in the fifth position, the sixth oil port 1371 and the seventh oil port 1372 are connected. When in the sixth position, the sixth oil port 1371 and the seventh oil port 1372 are disconnected.

[0049] Specifically, the first reversing valve 135 , the second reversing valve 136 and the third reversing valve 137 are all solenoid valves.

[0050] In this embodiment, the latch mechanism 15 includes an arm pin cylinder 151, a cylinder pin cylinder 153, an arm pin (not shown) and a cylinder pin (not shown). The arm pin cylinder 151 and the cylinder pin cylinder 153 are used to respectively drive the arm pin and cylinder pin of the latch mechanism 15 to extend and retract, thereby realizing the insertion and removal of the pin.

[0051] In this embodiment, telescopic cylinder 17 includes a cylinder barrel 171 and a piston 173. Piston 173 is movably disposed within cylinder barrel 171. Cylinder barrel 171 is divided into a rodless chamber 175 and a rod chamber 176 by the piston portion of piston 173. Both arm pin cylinder 151 and cylinder pin cylinder 153 are mounted on the outer sidewall of cylinder barrel 171 of telescopic cylinder 17.

[0052] Specifically, a first oil channel 1732 and a second oil channel 1734 are provided on the piston 173. The first oil channel 1732 extends from one end of the piston 173 located outside the cylinder 171 to the other end of the piston 173. The first oil channel 1732 is connected to the rodless chamber 175, and the second oil channel 1734 is connected to the rod chamber 176.

[0053] Specifically, the power unit 13 can be mounted on the outer wall of the cylinder barrel 171 of the telescopic cylinder 17, and the power unit 13 can be positioned adjacent to the latch mechanism 15, so that the oil pipe connecting the power unit 13 and the latch mechanism 15 is as short as possible. Of course, the power unit 13 can also be positioned at a greater distance from the latch mechanism 15.

[0054] In this embodiment, motor 131 is preferably a high-speed motor, and hydraulic pump 133 is preferably a high-speed main pump, but this is not limiting. Increasing the speed of motor 131 and hydraulic pump 133 can appropriately reduce the displacement of hydraulic pump 133. If the hydraulic pump flow rate is 9 L / min and the motor speed is 5000 rpm, the displacement of hydraulic pump 133 only needs to be 1.8 ml / r. A smaller displacement hydraulic pump 133 results in a smaller volume.

[0055] In this embodiment, the hydraulic oil in the power unit 13 and the latch mechanism 15 is low-temperature hydraulic oil.

[0056] The following briefly describes the working process of the single-cylinder latch control system.

[0057] When the boom is in its initial state, the cylinder pin on the telescopic cylinder 17 is inserted into the cylinder pin hole on the boom, and the arm pin is inserted into the arm pin hole. Both the cylinder pin and the arm pin are in the extended state, and the first reversing valve 135, the second reversing valve 136, and the third reversing valve 137 are all in the de-energized state. When the arm pin needs to be pulled out, the motor 131 is started, the hydraulic pump 133 outputs flow, the first reversing valve 135 is energized and is in the first position, the second reversing valve 136 is energized and is in the third position, and the third reversing valve 137 is de-energized and is in the second position. The pressurized oil passes through the first reversing valve 135 and the second reversing valve 136 to reach the arm pin cylinder 151, and the arm pin is pulled out. If the arm pin needs to be kept in the unpinned state, the second reversing valve 136 can be de-energized to lock the pressure oil, the arm pin can be kept in the unpinned state, and the motor 133 can be turned off; or the first reversing valve 135 and the second reversing valve 136 can be kept energized, and the motor 131 can be kept in the working state, and the arm pin can always be kept in the unpinned state under the action of the pressure oil. Conversely, when the arm pin needs to be released, the motor 131 stops working, the first reversing valve 135 and the second reversing valve 136 lose power, and the oil in the arm pin is ejected by the spring and enters the hydraulic oil tank. The control of unpinning, keeping unpinned, and releasing the cylinder pin is similar to that of the wall pin and will not be repeated here. It can be understood that the second reversing valve 136 and the third reversing valve 137 can be integrated into a new function as long as they can still achieve the existing function.

[0058] Second embodiment

[0059] The single-cylinder latch control system of the second embodiment of the present invention, please refer to Figure 7. The main difference between the single-cylinder latch control system of this embodiment and the single-cylinder latch control system of the first embodiment is that, in this embodiment, the fourth reversing valve 146 and the fifth reversing valve 147 are used to replace the first reversing valve 135, the second reversing valve 136 and the third reversing valve 137 of the first embodiment. The fourth reversing valve 146 can be a two-position four-way valve, and the fifth reversing valve 147 can be a two-position three-way valve. The specific connection method can realize the control of the extension and retraction of the arm pin cylinder 151 and the cylinder pin cylinder 153 respectively. Specifically, the fourth reversing valve 146 includes a first port, a second port, a third port and a fourth port. The first port is connected to the oil outlet of the hydraulic pump 133, the second port is connected to the oil tank 139 for returning oil, the third port is a blocking port, and the fourth port is connected to the fifth reversing valve 147; the fourth reversing valve 146 includes a seventh position and an eighth position. When the fourth reversing valve 146 is in the seventh position, the first port and the fourth port are connected, and the second port and the third port are connected. When the third reversing valve 146 is in the eighth position, the first port and the third port are connected, and the second port and the fourth port are connected. The fifth reversing valve 147 includes a fifth port, a sixth port and a seventh port. The fifth port is connected to the fourth port of the fourth reversing valve 146 through a one-way valve that only allows oil to flow from the fifth reversing valve 147 to the fourth reversing valve 146. The fifth port is also directly connected to the oil chamber of the cylinder pin cylinder 153, the sixth port is connected to the oil chamber of the arm pin cylinder 151, and the seventh port is connected to the fourth port of the fourth reversing valve 146; the fifth reversing valve 147 includes a ninth position and a tenth position. When in the ninth position, the fifth port is disconnected from the sixth port and the seventh port, and the sixth port is connected to the seventh port to allow the oil output from the fourth port of the fourth reversing valve 146 to flow into the arm pin cylinder 151 through the seventh port and the sixth port; when in the tenth position, the fifth port is connected to the seventh port, and the sixth port is disconnected from the fifth port and the seventh port to allow the oil output from the fourth port of the fourth reversing valve 146 to flow into the cylinder pin cylinder 153 through the seventh port and the fifth port.

[0060] Third embodiment

[0061] Referring to FIG8 , the single-cylinder latch control system of the third embodiment of the present invention differs from the single-cylinder latch control system of the first embodiment primarily in that, in this embodiment, the power unit 13 includes two motors 131, two hydraulic pumps 133, and two first reversing valves 135. Each motor 131, hydraulic pump 133, and first reversing valve 135 form a group. One group of motors 131, hydraulic pump 133, and first reversing valve 135 supplies oil to the arm pin cylinder 151, while the other group of motors 131, hydraulic pump 133, and first reversing valve 135 supplies oil to the cylinder pin cylinder 153. The first reversing valve 135 connects or disconnects the hydraulic pump 133 with the corresponding arm pin cylinder 151 or cylinder pin cylinder 153. First cables energizing both motors 131 are wound around the cable reel 11. The arm pin cylinder 151 and the cylinder pin cylinder 152 are supplied with oil respectively by two hydraulic pumps 133 , and the second reversing valve 136 and the third reversing valve 137 can be omitted.

[0062] Fourth embodiment

[0063] Referring to FIG9 , a fourth embodiment of the single-cylinder latch control system of the present invention differs from the first embodiment primarily in that, in this embodiment, the power unit 13 further includes a power battery 149, which is connected to the motor 131 to drive the motor 131. The provision of power battery 149 increases the instantaneous power of the system, improves system stability, and reduces the current flowing through the cable connected to the motor 131, thereby reducing the cable diameter.

[0064] Fifth embodiment

[0065] 10 , the single-cylinder latch control system of the fifth embodiment of the present invention is different from the single-cylinder latch control system of the fourth embodiment mainly in that, in the present embodiment, the motor 131 is powered only by the power battery 149 , and the first cable connected to the cable reel 11 can be omitted.

[0066] Sixth embodiment

[0067] Referring to Figure 11 , the single-cylinder latch control system of the sixth embodiment of the present invention differs primarily from the first embodiment in that, because the flow rates of both the wall pin cylinder 151 and the cylinder pin cylinder 153 are relatively low, resulting in a relatively low level of system oil, an accumulator 150 is employed instead of the oil tank 139 as the oil supply device. In this embodiment, the central channel is eliminated, reducing the system flow rate. Therefore, the accumulator 150 can meet operational requirements, eliminating the need for an oil tank.

[0068] The present invention also provides a crane comprising any one of the above-mentioned single-cylinder latch control systems.

[0069] In this embodiment, the crane includes an integrated hydraulic pump, an integrated motor, and an integrated power supply. The integrated power supply supplies power to the integrated motor, which in turn drives the integrated hydraulic pump. The integrated power supply also supplies power to motor 131. Hydraulic pump 133 is a separate hydraulic pump from the integrated hydraulic pump. Specifically, the integrated hydraulic pump supplies oil to the crane's luffing cylinder, mast cylinder, winch motor, and other components. The hydraulic oil pumped by hydraulic pump 133 can be low-temperature hydraulic oil, while the hydraulic oil pumped by the integrated hydraulic pump can be standard hydraulic oil. Therefore, the crane requires less low-temperature hydraulic oil, resulting in lower costs.

[0070] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A single-cylinder latch control system, comprising a power unit (13), a latch mechanism (15) and a telescopic oil cylinder (17), characterized in that: The power unit (13) comprises a motor (131), a hydraulic pump (133) and a control valve group. The motor (131) is connected to the hydraulic pump (133) to drive the hydraulic pump (133). The hydraulic pump (133) is connected to the control valve group to supply oil to the latch mechanism (15) through the control valve group to achieve the insertion and extraction of the pin. The power unit (13) is arranged on the outer side wall of the telescopic oil cylinder (17).

2. The single-cylinder latch control system according to claim 1, characterized in that: The single-cylinder latch control system further comprises a cable drum (11), a first cable for energizing the motor (131) being connected to the motor (131) via the cable drum (11), and a second cable for energizing the control valve group being connected to the control valve group via the cable drum (11).

3. The single-cylinder latch control system according to claim 1, characterized in that: The power unit (13) further comprises a power battery (149), and the power battery (149) is connected to the motor (131).

4. The single-cylinder latch control system according to claim 1, characterized in that: The single-cylinder latch control system further comprises a cable reel (11), the power unit (13) further comprises a power battery (149), the motor (131) is powered by a first cable and the power battery (149), the first cable for energizing the motor (131) is connected to the motor (131) via the cable reel (11), and the second cable for energizing the control valve group is connected to the control valve group via the cable reel (11).

5. The single cylinder latch control system according to claim 1, characterized in that: The telescopic oil cylinder (17) comprises a cylinder barrel (171) and a piston (173); the piston (173) is arranged in the cylinder barrel (171) so as to be movable relative to the cylinder barrel (171); the power unit (13) is arranged on the outer side wall of the cylinder barrel (171) of the telescopic oil cylinder (17); and the power unit (13) is arranged adjacent to the latch mechanism (15).

6. The single-cylinder latch control system according to claim 5, characterized in that: The latch mechanism (15) comprises an arm pin oil cylinder (151) and a cylinder pin oil cylinder (153), and the arm pin oil cylinder (151) and the cylinder pin oil cylinder (153) are both installed on the outer side wall of the cylinder barrel (171) of the telescopic oil cylinder (17).

7. The single-cylinder latch control system according to claim 6, characterized in that: The power unit (13) is arranged adjacent to the latch mechanism (15).

8. The single-cylinder latch control system according to claim 1, characterized in that: The single-cylinder latch control system also includes an oil supply device, the hydraulic pump (133) is connected to the oil supply device, so that the oil supply device supplies oil to the hydraulic pump (133); the power unit (13) also includes an oil supply oil circuit (143) and an oil return oil circuit (144), one end of the oil supply oil circuit (143) is connected to the oil outlet of the hydraulic pump (133), and the other end is connected to the control valve group, and one end of the oil return oil circuit (144) is connected to the oil supply device, and the other end is connected to the control valve group.

9. The single-cylinder latch control system according to claim 8, characterized in that: The control valve group comprises a first reversing valve (135), a second reversing valve (136) and a third reversing valve (137); the first reversing valve (135) is connected to the hydraulic pump (133); the second reversing valve (136) and the third reversing valve (137) are respectively connected to the first reversing valve (135); the latch mechanism (15) comprises an arm pin oil cylinder (151), a cylinder pin oil cylinder (153), an arm pin and a cylinder pin; the arm pin oil cylinder (151) and the third reversing valve (137) are respectively connected to the first reversing valve (135); The cylinder pin oil cylinder (153) is used to drive the arm pin and the cylinder pin to extend and retract respectively; the first reversing valve (135) includes a first oil port (1351), a second oil port (1352) and a third oil port (1353); the first oil port (1351) is connected to the oil supply oil circuit (143); the second oil port (1352) is connected to the oil return oil circuit (144); the third oil port (1353) is connected to the second reversing valve (136) and the first reversing valve (136). The three-way reversing valve (137), wherein the first reversing valve (135) includes a first position and a second position. When in the first position, the first oil port (1351) and the third oil port (1353) are connected, and the first oil port (1351) and the third oil port (1353) are both disconnected from the second oil port (1352). When in the second position, the first oil port (1351), the second oil port (1352) and the third oil port (1353) are all connected. The second reversing valve (136) comprises a fourth oil port (1361) and a fifth oil port (1362), wherein the fourth oil port (1361) is connected to the first reversing valve (135), and the fifth oil port (1362) is connected to the oil chamber of the arm pin cylinder (151) of the latch mechanism (15). The second reversing valve (136) comprises a third position and a fourth position. When in the third position, the fourth oil port (1361) and the fifth oil port (1362) are in communication. When in the fourth position, the fourth oil port (1361) and the fifth oil port (1362) are disconnected; the third reversing valve (137) includes a sixth oil port (1371) and a seventh oil port (1372), the sixth oil port (1371) is connected to the first reversing valve (135), and the seventh oil port (1372) is connected to the oil chamber of the cylinder pin cylinder (153) of the latch mechanism (15); the third reversing valve (137) includes a fifth position and a sixth position, when in the fifth position, the sixth oil port (1371) and the seventh oil port (1372) are connected, and when in the sixth position, the sixth oil port (1371) and the seventh oil port (1372) are disconnected.

10. The single cylinder latch control system according to claim 1, characterized in that: The latch mechanism (15) comprises an arm pin cylinder (151), a cylinder pin cylinder (153), an arm pin and a cylinder pin. The arm pin cylinder (151) and the cylinder pin cylinder (153) are used to respectively drive the arm pin and the cylinder pin to extend and retract. The power unit (13) comprises two motors (131) and two hydraulic pumps (133). The control valve group comprises two first reversing valves (135). One motor (131), one hydraulic pump (133) and one first reversing valve (135) form a group for supplying oil to the arm pin cylinder (151). Another motor (131), another hydraulic pump (133) and another first reversing valve (135) form a group for supplying oil to the cylinder pin cylinder (153). The first reversing valve (135) is used to connect or disconnect the hydraulic pump (133) with the corresponding arm pin cylinder (151) or cylinder pin cylinder (153).

11. The single-cylinder latch control system according to claim 8, characterized in that: The oil supply device is an oil tank (139) or an accumulator (150).

12. The single-cylinder latch control system according to claim 1, characterized in that: The hydraulic oil in the power unit (13) and the latch mechanism (15) is low-temperature hydraulic oil.

13. The single cylinder latch control system according to claim 1, characterized in that: The motor (131) is a high-speed motor, and the hydraulic pump (133) is a high-speed main pump.

14. A crane, characterized in that: It comprises a single cylinder latch control system as described in any one of claims 1-13.

15. The crane according to claim 14, characterized in that The crane comprises a complete hydraulic pump, a complete motor and a complete power supply, wherein the complete power supply supplies power to the complete motor and the motor (131), and the complete motor drives the complete hydraulic pump to operate.

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