43results about How to "Prevent it from coming out" patented technology

The invention relates to the technical field of textile processing, and discloses a dyeing process for polyester fabric. The unrolled polyester fabric is processed by the steps of S1, presetting greycloth; S2, desizing the grey cloth after presetting; S3, rinsing to neutralize the desized grey cloth; S4, dyeing the grey cloth which is neutralized by rinsing, wherein dyestuff comprises chemical components: by weight, 20-30 parts of disperse dyes, 18-26 parts of wetting agents, 70-90 parts of high temperature levelling agents, 10-15 parts of ethylic acid, 12-16 parts of aminopropyl laurylglutamine, 2-6 parts of trisodium sulfosuccinate and 250-300 parts of water, and dyeing temperature is controlled within 100-130 DEG C; S5, washing; S6, dewatering; S7, scutching; S8, sizing to obtain the dyed polyester fabric. With application of aminopropyl laurylglutamine and trisodium sulfosuccinate, the dye-uptake rate of the polyester fabric is increased.

The invention discloses a fishing vessel with a spherical solar battery. The fishing vessel with the spherical solar battery comprises a deck, two vessel bodies with the same structure, a counter weight water tank, two semi-cylindrical floating bodies and the spherical solar battery, wherein the deck is laid on the tops of the two vessel bodies; a gap is formed between the two vessel bodies; each vessel body comprises an outer side wall plate, an inner side wall plate and a bottom faceplate; the bottom faceplates are parallel to the deck; the inner side wall plates are perpendicular to the bottom faceplates; each outer side wall plate is of a V-shaped structure formed by abutting joint of an upper inclined faceplate and a lower inclined faceplate; the counter weight water tank is arranged between the two vessel bodies and is located below the deck; the two semi-cylindrical floating bodies are respectively arranged at the side parts of the two vessel bodies; the spherical solar battery is arranged on a supporting seat which is arranged on the top of a rest room; and the rest room is arranged on the deck. Due to adoption of the spherical solar battery, the problem that a planar solar battery on a mobile vessel is rarely irradiated by sunlight is solved.

The invention relates to the technical field of textile processing, and discloses a dyeing technology of heavy twisting polyester fabrics. Gray fabrics are processed by adopting a processing method. The processing method comprises the following steps that S1, the gray fabrics are subjected to pre-shrinking; S2, the preshrunk gray fabrics are subjected to one-time presetting; S3, after one-time presetting, the gray fabrics are subjected to alkali amount reduction; S4, after alkali amount reduction, the gray fabrics are subjected to washing and neutralizing; S5, after washing and neutralizing, the gray fabrics are dyed; S6, the dyed gray fabrics are subjected to deep dyeing, wherein deep dyeing comprises the following steps that a, dye liquid for dyeing in the S5 is used, and the gray fabrics are subjected to continuous flushing dyeing at high temperature; b, after flushing dyeing, the temperature is preserved; c, after temperature preservation, the temperature is reduced to the indoor temperature; S7, after deep dyeing, the gray fabrics are subjected to overflow-water washing; S9; after overflow-water washing, the gray fabrics are subjected to setting; after setting in the S9, the dyed heavy twisting polyester fabrics are obtained. Through the above-mentioned dyeing technology, the dye-uptake rate of the integral heavy twisting polyester fabrics is increased ultimately.

The invention discloses a fishing vessel with a player. The fishing vessel with the player comprises a deck, two vessel bodies with the same structure, a spherical solar battery, loudspeaker boxes and the player, wherein the deck is laid on the tops of the two vessel bodies; a gap is formed between the two vessel bodies; each vessel body comprises an outer side wall plate, an inner side wall plate and a bottom faceplate; the bottom faceplates are parallel to the deck; the inner side wall plates are perpendicular to the bottom faceplates; each outer side wall plate is of a V-shaped structure formed by abutting joint of an upper inclined faceplate and a lower inclined faceplate; the spherical solar battery is arranged on a supporting seat which is arranged on the top of a rest room; the rest room is arranged on the deck; the loudspeaker boxes are arranged on the bottoms of the vessel bodies; and the player is used for simulating sounds made by fish and transmitting the sounds to the loudspeakers for playing. Due to arrangement of the player, the sounds made by the fish can be simulated so as to attract the fish to gather toward the position of the vessel, thereby increasing the working efficiency of fishing.

The invention belongs to the technical field of dustproof devices and particularly relates to a dustproof device for a cement mixing machine. The dustproof device comprises dustproof plates, driving arc strips and the like. The dustproof device is provided with a heavy threaded ring, an opening end of a cement stirring shell inclines downwards and upwards in the loading and filling processes of acement stirring joint, the heavy threaded ring rotates along two symmetrical spiral slots formed in a second fixed ring under the effect of gravity, the six driving arc strips drive the correspondingdustproof plates to rotate around a second column pin, and the loading or filling operation of the cement mixing machine can be finished; and when the cement mixing machine is used for normally stirring, the six driving arc strips drive the corresponding dustproof plates to rotate around the second column pin so as to close the opening end of the cement stirring shell, so that a dustproof mechanism is capable of preventing dust in the cement stirring shell from being discharged out during the normal stirring operation of the cement mixing machine.

The invention discloses a roller type fishing boat with an adjustable light angle. The roller type fishing boat comprises a deck, two boat bodies, an xenon search light, an angle adjusting device, wheels and foldable wheel stands, wherein each boat body comprises an outer side wall plate, an inner side wall plate and a bottom panel; each outer side wall plate has a V-shaped structure formed by butt joint of an upper inclined panel and a lower inclined panel; the angle adjusting device comprises a support frame, a vertical shaft, a servo motor A, a rotating frame, a transverse shaft, a servo motor B and a supporting seat; through control of the servo motor A and the servo motor B, the irradiation direction and irradiation angle can be adjusted; the foldable wheel stands comprise wheel brackets and hydraulic cylinders; the wheel brackets are hinged to the lower ends of the inner side wall plates of the boat bodies; the wheels are mounted on the wheel brackets; when folded, the hydraulic cylinders pull the wheel brackets into grooves in bottom panels of the boat bodies. Due to arrangement of the wheels, the boat can be easily pulled out of the water surface to be maintained. The xenon search light and the angle adjusting device are arranged, so that light rays can be gathered to a very far place.

The invention discloses a fishing boat with a xenon light searchlight. The fishing boat comprises a deck and two hulls of the same structure. The deck is laid at the tops of the two hulls. A gap is formed between the two hulls. Each hull comprises an outer side wall plate, an inner side wall plate and a bottom panel. Each bottom panel is parallel to the deck. Each inner side wall plate is perpendicular to the corresponding bottom panel. Each outer side wall plate is of a V-shaped structure composed of an upper oblique panel and a lower oblique panel in a butt joint mode. The fishing boat also comprises a spherical solar cell which is arranged on a supporting base. The supporting base is arranged at the top of a rest room. The rest room is arranged on the deck. The fishing boat further comprises fault warning flashing lights. The four fault warning flashing lights are arranged on the four walls of the supporting base. The fishing boat further comprises the xenon light searchlight. The xenon light searchlight is arranged on a supporting frame. The supporting frame is arranged at the top of the rest room. The xenon light searchlight is additionally arranged, light rays can be gathered to a very far place, the searchlight filled with xenon is especially adopted, and a good lighting effect is achieved.

The invention discloses a new energy car seat with a built-in trash can, comprising a seat and a seat back, the bottom end of the seat back is fixedly connected with the upper surface of the seat, and the upper surface of the seat is provided with cotton pad, the front of the chair back is provided with a first groove, a second groove and a third groove, the first groove communicates with the second groove, and the second groove communicates with the third groove The upper surface and the lower surface of the inner wall of the first groove are respectively fixedly connected with the top end and the bottom end of the rotating shaft, the surface of the rotating shaft is sleeved with a bearing, and the surface of the bearing is fixedly connected with a rotating rod. The new energy car seat with a built-in trash can fixes the position of the trash can body by installing the trash can body inside the back of the seat, making it easy for people to find the trash can body, thus bringing more convenience to people when throwing garbage. It is very convenient, saves the space inside the car, and facilitates people's travel.

The invention discloses a fishing vessel with a camera. The fishing vessel comprises a deck and two vessel bodies having the same structure. The deck is laid at the tops of the two vessel bodies. A clearance is disposed between the two vessel bodies. Each vessel body comprises an outer side wall plate, an inner side wall plate and a bottom plate. Each bottom plate is parallel to the deck. Each inner side wall plate is vertical to the corresponding bottom plate. Each outer side wall plate is of a V-shaped structure formed by butt joint of an upper inclined plate and a lower inclined plate. Two sides of a fish cage are provided with fish inlets, a track is disposed at each fish inlet, and an electric gate is disposed on each track. When an electromagnet is energized, the corresponding electric gate is attracted to close the corresponding fish inlet. When the electromagnet is not energized, the corresponding electric gate is reset by a tension spring to open the corresponding fish inlet. The fishing vessel also comprises the camera and a computer, and the camera is disposed in the fish cage and connected with the computer on the deck via a data line. Due to the fact that the camera and the computer are added, conditions of the fish cage under the water are observed via the computer, and the electric gates can be closed when more fishes enter the fish cage.

The invention discloses an energy-saving environment-friendly idler wheel type fishing vessel. The energy-saving environment-friendly idler wheel type fishing vessel comprises a deck, two vessel bodies with the same structure, a spherical solar battery, wheels and folding wheel carriers, wherein the deck is laid on the tops of the two vessel bodies; a gap is formed between the two vessel bodies; each vessel body comprises an outer side wall plate, an inner side wall plate and a bottom faceplate; the bottom faceplates are parallel to the deck; the inner side wall plates are perpendicular to the bottom faceplates; each outer side wall plate is of a V-shaped structure formed by abutting joint of an upper inclined faceplate and a lower inclined faceplate; each folding wheel carrier comprises a wheel support and a hydraulic cylinder; the wheel support is articulated with the lower end of the inner side wall plate of the vessel body; the wheel is arranged on the wheel support; when the folding wheel carrier is folded, the hydraulic cylinder is pulled to the wheel support and enters a groove in the bottom of the vessel body; and when the folding wheel carrier is unfolded, the hydraulic cylinder pushes the wheel support to expand downwards. Due to arrangement of the wheels, the fishing vessel can be conveniently pulled out from the water surface so as to be maintained. Due to adoption of the spherical solar battery, the problem that a planar solar battery on a mobile vessel is rarely irradiated by sunlight is solved.

The invention relates to the technical field of mechanical parts and discloses a rotating mounting type coupling. The coupling comprises a front-half coupling and a back-half coupling; the front-half coupling is located on the left side of the back-half coupling; wedge-shaped grooves are formed in edges of opposite surfaces of the front-half coupling and the back-half coupling; bolt holes are formed in the surface of the front-half coupling and the surface of the back-half coupling; bolts are in threaded connection in the bolt holes; a first fixed sleeve is fixedly connected in the middle of the left side surface of the front-half coupling; and a first rotating shaft is inserted in the first fixed sleeve. According to the rotating mounting type coupling, L-shaped grooves, guiding grooves, connecting rods and clamping pieces are arranged, each clamping piece is inserted in the corresponding L-shaped groove and moves to one end of the transverse groove of the L-shaped groove, during deceleration or acceleration, the width of the guiding grooves is smaller than that of the clamping pieces, the clamping pieces can be blocked, shaking can be prevented, the coupling is stabilized, and the coupling is simple to operate.

The invention discloses digital automatic mining type ore dressing equipment. The digital automatic mining type ore dressing equipment comprises a machine case of an ore dressing machine, a discharging assembly and a dust collection assembly, wherein a feeding hopper and the dust collection assembly are arranged at the top of the machine case of the ore dressing machine; the feeding hopper is mounted at one side of the dust collection assembly; a first hobbing shaft is mounted in the machine case of the ore dressing machine; a coarse filtration plate is arranged below the first hobbing shaft;a second hobbing shaft is mounted below the coarse filtration plate. The digital automatic mining type ore dressing equipment disclosed by the invention has the beneficial effects that raw ores can bedirectly subjected to polishing and cutting treatment in the ore dressing equipment and the screening speed of the ore dressing equipment on the ores is greatly improved through the screening of twolayers of the filtration plates, and the product competitiveness of enterprises is improved; the dust collection assembly is arranged at the top of the ore dressing equipment and dust and inhalable particles generated in the ores in a screening process can be pumped out and are prevented from being discharged from a discharging opening of the ore dressing equipment, so that the environmental health of the periphery is protected.

The invention discloses a movable and turnover automatic burdening mechanism which comprises a plurality of material bins and a weighing instrument.A control valve is arranged at an outlet of each material bin, and the outlets of the materials bins are located on the same straight lime.The weighing instrument is arranged on a linear guide rail and can move along the linear guide rail, and the moving track of the weighing instrument passes through the part below the outlets of all the material bins.The weighing instrument comprises a base arranged on the linear guide rail, and the base is connected with a servo motor driving the base to move along the linear guide rail.The base is provided with a scale with a weighing sensor, and a turnover mechanism capable of driving the scale to turn over downwards to lead materials out.The movable and turnover automatic burdening mechanism can achieve automatic burdening accurately, and the burdening efficiency is greatly improved; only one weighing instrument is adopted for weighing and burdening, and thus compared with the prior art, cost is greatly reduced.

The invention discloses a gynecologic inflammation suppository propeller. The gynecologic inflammation suppository propeller comprises compression sponge, a traction piece fixed to the compression sponge and led out of the tail end of the compression sponge and a packaged guiding piece. The packaged guiding piece comprises a guiding sleeve arranged on the outer side of the compression sponge in a sleeving mode, and the front end of the guiding sleeve is opened. A suppository containing cavity is formed between the front end of the guiding sleeve and the compression sponge. A push rod capable of pushing the compression sponge and the suppository placed in the suppository containing cavity out is arranged at the tail end of the guiding sleeve. After the suppository is placed in the suppository containing cavity and the guiding sleeve is placed in the vagina, the push rod pushes the compression sponge and the suppository out together, and the compression sponge and the suppository are placed in the vagina. Compared with the prior art, the gynecologic inflammation suppository propeller has the following advantages that the suppository is placed at the appropriate position; fast detumescence is achieved; microorganisms and other large particulate matter are locked in a targeted mode, medicine in the vagina is evenly distributed; the impact therapy is adopted, and a relapse is reduced.

The invention discloses a fishing vessel with a bloody material luring box. The fishing vessel with the bloody material luring box comprises a deck and two vessel bodies of the same structure, the deck is laid at the tops of the two vessel bodies, and a gap is formed between the two vessel bodies. Each vessel body comprises an outer side wall plate, an inner side wall plate and a bottom panel, wherein the bottom panel is parallel to the deck, the inner side wall plate is perpendicular to the bottom panel, and the outer side wall plate is of a V-shaped structure formed by butting joint of an upper inclined panel and a lower inclined panel. The fishing vessel further comprises a winch and a fish basket; the winch is arranged on the deck; the fish basket is connected with a stay cord wound on the winch; fish inlets are formed in the two sides of the fish basket; and soft inverted thorns for preventing fishes from coming out of the fish basket are arranged on the periphery of each fish inlet. The fishing vessel further comprises the bloody material luring box which is arranged in the fish basket. As the bloody material luring box is additionally arranged in the fish basket and put into sea along with the fish basket, bloody materials give out bursts of blood smell along with impact of water flow, and fishes are attracted to enter the basket to find food, so that the fish luring effect is improved.

The invention provides an environment-friendly production process for chemical bulk drugs. The environment-friendly production process is characterized by comprising the following steps of 1, a feeding preparation procedure, specifically, continuously conveying the bulk drugs to a powder box by a feeding machine; 2, a material distributing procedure, specifically, arranging a sub-packaging mechanism below the powder box to sequentially subpackage the bulk drugs into storage bins in all sub-packaging barrels in a material receiving mechanism; 3, a synchronous bagging procedure, specifically, arranging a bagging mechanism behind a material distribution assembly, and sleeving the outer sides of the sub-packaging barrels containing powder with material bags; 4, a filling and dedusting procedure, specifically, feeding the bulk drugs into the material bags, and controlling flying dust in the storage bins in cooperation with the material bags so as to prevent the flying dust from escaping; and 5, a bag sealing procedure, specifically, falling the material bags filled with the bulk drugs onto a transfer conveyor belt, and sealing the material bags by a bag sealing mechanism on a transmission path of the transfer conveyor belt. The problems that the flying dust is prone to being generated in bulk drug packaging, and quantitative packaging cannot be effectively achieved are solved.

The invention belongs to the technical field of dustproof devices and particularly relates to a dustproof device for a cement mixing machine. The dustproof device comprises dustproof plates, driving arc strips and the like. The dustproof device is provided with a heavy threaded ring, an opening end of a cement stirring shell inclines downwards and upwards in the loading and filling processes of acement stirring joint, the heavy threaded ring rotates along two symmetrical spiral slots formed in a second fixed ring under the effect of gravity, the six driving arc strips drive the correspondingdustproof plates to rotate around a second column pin, and the loading or filling operation of the cement mixing machine can be finished; and when the cement mixing machine is used for normally stirring, the six driving arc strips drive the corresponding dustproof plates to rotate around the second column pin so as to close the opening end of the cement stirring shell, so that a dustproof mechanism is capable of preventing dust in the cement stirring shell from being discharged out during the normal stirring operation of the cement mixing machine.

The invention provides filling equipment capable of controlling the discharging amount of chemical raw material medicine. The filling equipment comprises a powder box and a transfer conveying belt arranged below the powder box. The filling equipment further comprises a material filling mechanism, a sub-packaging mechanism and a bagging mechanism. The material filling mechanism comprises a material separating assembly and a material distributing assembly, wherein the material separating assembly obtains quantitative powder from the powder box, and the material distributing assembly drives the material separating assembly to move to output the powder. The sub-packaging mechanism comprises a conveying line and sub-packaging barrels. The bagging mechanism comprises a bag taking assembly and a bagging assembly, wherein the bag taking assembly conveys material bags to the bagging assembly one by one, and the bagging assembly enables the material bags to sleeve the outer sides of the sub-packaging barrels. The powder is quantitatively outputted through the material filling mechanism, the powder is driven and transferred by the sub-packaging barrels, the outer sides of the sub-packaging barrels are rapidly bagged through the cooperation of the bagging mechanism, and then the powder is conveyed into the material bags through a bearing piece; and flying dust is prevented from overflowing in the whole process, the dust is effectively absorbed, and quantitative packaging can be achieved.

The invention belongs to the field of sport equipment, and particularly relates to a protection horizontal bar. The protection horizontal bar comprises a cross rod assembly and two supporting columnswhich are connected to the two ends of the cross rod assembly respectively. The protection horizontal bar further comprises an air blower and an anti-skid powder box; the cross rod assembly comprisesan anti-skid sleeve, a supporting sleeve and an air bag which are sequentially arranged from outside to inside in a sleeving mode; one end of the air bag is provided with a valve, and one end of the air bag can be communicated with an air outlet of the air blower; one end of the anti-skid powder box is communicated with the supporting sleeve, and the other end of the anti-skid powder box is communicated with the air outlet of the air blower; an inner through hole is formed in the supporting sleeve, and an outer through hole is formed in the anti-skid sleeve; an extrusion plate used for extruding the air bag is arranged at the bottom of the air bag, and an extrusion column penetrating through the supporting sleeve is connected between the extrusion plate and the anti-skid sleeve. In the technical scheme, the horizontal bar has an anti-skid function, and is good in use safety performance.

The invention discloses an automatic-adjusting button sewing machine, comprising a base. First air cylinders are mounted on the base, and a top plate is mounted on the first air cylinders through pushrods; a ball screw is mounted on the top plate, and is connected with a first motor and a first hydraulic cylinder, and an upper punch is connected to the first hydraulic cylinder; a first hydraulicrod is connected between the upper punch and the first hydraulic cylinder, and an automatic sending device is connected to one side of the end of the upper punch; a first positioning block is mountedin a movable base through a first connecting wire, and a Hall element is mounted in the first positioning block; a second positioning block is mounted on the base through a second connecting rod, andmagnet is arranged in the second positioning block; a push block is arranged at one side of the second connecting rod, a positioning plate and a plurality of compression springs are mounted on the push block, and a stamp die is arranged on the top surface of the positioning plate. The automatic-adjusting button sewing machine can not only improve work efficiency, but has the advantages of high convenience in adjustment and use, wide application range, low labor intensity, good structural stability and long service life.

The invention discloses a roller-type fishing boat for simulating voice to attract fish. The roller-type fishing boat comprises a deck, two boat bodies with the same structure, wheels and a folding wheel carrier, wherein the deck is paved at the tops of the two boat bodies; each boat body comprises an outer side wall plate, an inner side wall plate and a bottom panel; the outer side wall plate is docked with an upper inclined panel and a lower inclined panel to form a V-shaped structure; the folding wheel carrier comprises a wheel bracket and a hydraulic cylinder; the wheel bracket is hinged with the lower end of the inner side wall plate of each boat body; the wheels are arranged on the wheel bracket; a hydraulic cylinder is pulled to the wheel bracket to enter a groove in a bottom panel of each boat body during folding; and the hydraulic cylinder pushes the wheel bracket to expand downwards during expansion. The wheels are added, so that the boat can be conveniently pulled out of water for maintenance. The roller-type fishing boat also comprises sound boxes and a player, wherein the sound boxes are arranged at the bottoms of the boat bodies; and the player transmits voice emitted by the fish to the sound boxes for playing. The player is added, so that the voice emitted by the fish can be simulated to attract the fish to gather towards the position of the boat.

The invention discloses a roller type fishing boat provided with a bathroom. The roller type fishing boat comprises a deck, two boat bodies with the same structures, an electric control box, a power supply switcher and the bathroom, wherein each boat body comprises an outer side wall plate, an inner side wall plate and a bottom plate; each outer side wall plate is of a V-shaped structure formed by connecting an upper oblique plate and a lower oblique plate in a butt joint way; the power supply switcher comprises a solar cell power supply, a diesel generator power supply and a power switch; the electric control box is electrically connected with the solar cell power supply and the diesel generator power supply through the power switch; an auxiliary contact is arranged in the power switch; the auxiliary contact is electrically connected with a guide angle of an MCU (Microprogrammed Control Unit) main control chip in the electric control box through a data line; the bathroom is arranged on the deck; a cold / hot water spray head and a sauna bathroom are arranged in the bathroom. Due to the additional arrangement of the bathroom, convenience is brought to life on the boat.

The invention discloses a 5-chloro-1-indanone acylation kettle capable of reducing the slagging condition of the inner walls of kettle bodies. The kettle comprises an upper kettle body and a feeding control device, end blocks are arranged at the left end and the right end of the upper kettle body, the top end of the upper kettle body is fixedly connected with a material box, a valve is arranged atthe right side of the feeding control device, a connecting rod is welded to the left end of the lower kettle body, a discharging tube is arranged at the bottom of the lower kettle body, the left endand the right end of the upper kettle body are movably connected with clamping blocks, the bottoms of supporting columns are fixedly connected with a pedestal, the left end of the connecting rod is movably connected with a belt, and an anticorrosive layer is arranged on the surface of each of the upper kettle body, a lower kettle body, stirring rods and the connecting rod. The 5-chloro-1-indanoneacylation kettle capable of reducing the slagging condition of the inner walls of kettle bodies solves the problem of easy slagging of the inner wall of the device, also solves the problem of inconvenience in slag removal by a user, also can prevent slagging of the inner walls, is very convenient for the user to carry out slag removal, and is very practical.

The invention provides a cutter device of a granulator. The cutter device comprises a sector disc. A plurality of cutter bars which extend along the axial direction of the sector disc are fixed onto the peripheral direction of the sector disc, cutters which radially extend along the sector disc are arranged on the cutter bars, and all the cutters are positioned on different locations in the axialdirection of the sector disc. The invention further provides the granulator. The granulator comprises a bed, two gear ring dies, a power mechanism and the cutter device. The gear ring dies mesh with each other; die holes are formed in the gear ring dies; a feed channel is arranged on the bed, and an outlet of the feed channel is formed in meshing portions of outer rings of the two gear ring dies;the sector disc which is arranged on the bed is coaxial with the gear ring dies, and the periphery of the sector disc peripherally extends along the inner rings of the gear ring dies; the cutter barsare fixed onto the periphery of the sector disc, and the cutters are arranged at the inner rings of the gear ring dies. The cutter device and the granulator have the advantages that the cutter deviceof the granulator is low in stress, convenient to replace, difficult to abrade and long in service life; stable load is applied to the granulator, the granulator is long in service life, low in energyconsumption and high in yield and production efficiency, and the cutters are convenient to replace.

An adjusting device and a hydraulic machine provided with the adjusting device are disclosed, High control pressure can be applied to the regulating piston via a non-return valve integrated into the regulating valve. A check valve is formed by the spring seat of a measuring spring and the end section of a control piston of a regulating valve. The stroke of the spring seat ring relative to the control piston is restricted by a stroke limiting mechanism.